Dr. Ashok K. Sood Profile

Dr. Ashok K. Sood

President at Magnolia Optical Technologies Inc

SPIE Involvement:

Conference Program Committee | Conference Chair | Editor | Author

Publications (121)

Proceedings Article | 19 October 2023 Presentation + Paper

Presentation + Paper

Applications of T2SL barrier infrared detectors in observational instruments

Sarath Gunapala, William Johnson, David Ting, Alexander Soibel, Sir Rafol, Sam Keo, Brian Pepper, Cory Hill, Olga Kalashnikova, Michael Garay, Ashley Davies, Ashok Sood, John Zeller, Paul Lucey, Robert Wright, Miguel Nunes, Sachidananda Babu, Parminder Ghuman

Proceedings Volume 12729, 127290Q (2023) https://doi.org/10.1117/12.2679191

KEYWORDS: Staring arrays, Fire, Equipment, Quantum efficiency, Mid-IR, Long wavelength infrared, Infrared detectors, Temperature metrology, Infrared radiation, Dark current

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Proceedings Article | 10 October 2023 Presentation + Paper

Presentation + Paper

Advanced MWIR and LWIR band detection and imaging with nanostructured antireflection coating technology

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Alexander Soibel, David Ting, Sarath Gunapala, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 12687, 1268704 (2023) https://doi.org/10.1117/12.2679503

KEYWORDS: Antireflective coatings, Nanostructuring, Gallium antimonide, Long wavelength infrared, Zinc sulfide, Staring arrays, Mid-IR, Reflectivity, Reflection, Refractive index

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Proceedings Article | 10 October 2023 Presentation + Paper

Presentation + Paper

High-performance graphene-enhanced HgCdTe photodetectors for uncooled extended infrared band sensing and imaging

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Nibir Dhar, Samiran Ganguly, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 12687, 126870A (2023) https://doi.org/10.1117/12.2679887

KEYWORDS: Graphene, Mercury cadmium telluride, Mid-IR, Photodetectors, Boron, Doping, Infrared sensors, Infrared imaging, Infrared radiation, Chemical species

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Proceedings Article | 10 October 2023 Presentation

Presentation

Compact fire infrared radiance spectral tracker (c-FIRST)

Sarath Gunapala, David Ting, Alexander Soibel, William Johnson, Olga Kalashnikova, Michael Garay, Ashley Davies, Sir Rafol, Sam Keo, Brian Pepper, Cory Hill, Cristopher David, Ashok Sood, John Zeller, Sachidananda Babu, Parminder Ghuman

Proceedings Volume PC12687, PC1268703 (2023) https://doi.org/10.1117/12.2679211

KEYWORDS: Fire, Infrared radiation, Infrared search and track, High dynamic range imaging, Mid-IR, Staring arrays, Remote sensing, Infrared imaging, Imaging systems, Digital electronics

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Remote sensing and characterization of high temperature targets on the Earth’s surface is required for many cross-disciplinary science investigations and applications including fire and volcano impacts on ecology, the carbon cycle, and atmospheric composition. For decades this research has been hindered by insufficient spatial resolution and/or detector saturation of satellite sensors operating at short and mid-infrared wavelengths (1-5 μm) where the spectral radiance from high temperature (>800 K) surfaces is most significant. To address this critical need, the Jet Propulsion Laboratory is developing a compact modular high dynamic range (HDR) multispectral imager concept, with the flexibility to operate in the short, mid- or long-wavelength infrared spectral bands. The goal of this project is to demonstrate this novel technology through the maturation of a mid-wavelength infrared (MWIR) imager, the Compact Fire Infrared Radiance Spectral Tracker (c-FIRST), which leverages digital focal plane array (DFPA) developed under the Advanced Component Technology (ACT) Program of the NASA Earth Science Technology Office. The DFPA is comprised of a state-of-the-art high operating temperature barrier infrared detector (HOT-BIRD) and a digital readout integrated circuit (D-ROIC), which features an in-pixel digital counter to prevent current saturation, and thereby provides very high dynamic range (>100 dB). The DFPA will thus enable unsaturated, high-resolution imaging and quantitative retrievals of targets with a large variation in temperatures, ranging from 300 K (background) to >1600 K (hot flaming fires). With the resolution to resolve 50 m-scale thermal features on the Earth’s surface from a nominal orbital altitude of 400 km, the full temperature and area distribution of fires and active volcanic eruptions and the cool background are captured in a single observation, increasing science content per returned byte. The use of a non-saturating detector is novel, overcomes previous problems where high radiance values saturate detectors (which diminishes the science content and usefulness of the data), and demonstrates a breakthrough capability in remote sensing – one with broad applicability in both terrestrial and planetary settings. By incorporating this technology, c-FIRST is suitable for quantifying emissions from fires and volcanic eruptions of different temperatures and intensities, which is critical for establishing their impact on ecosystems, carbon fluxes, and air-quality at local scales and climate at global scales. In this presentation we will discuss the properties of the c-FIRST focal plane array. The research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. © 2023. All rights reserved.

Proceedings Article | 12 July 2023 Open Access

Open Access

Paper

Development of T2SLS LWIR focal plane arrays for the hyperspectral thermal imager (HyTI)

Sarath Gunapala, David Ting, Sir Rafol, Alexander Soibel, Arezou Khoshakhlagh, Sam Keo, Brian Pepper, Anita Fisher, Cory Hill, Ashok Sood, John Zeller, Paul Lucey, Robert Wright, Miguel Nunes, Luke Flynn, Sachidananda Babu, Parminder Ghuman

Proceedings Volume 12777, 127773O (2023) https://doi.org/10.1117/12.2690546

KEYWORDS: Astronomical imaging, Thermography, Staring arrays, Long wavelength infrared, Hyperspectral imaging

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Proceedings Article | 15 June 2023 Paper

Paper

Advanced nanostructured antireflection coatings for high performances IR detector and imaging applications

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Sarath Gunapala, Alexander Soibel, David Ting, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 12514, 125140F (2023) https://doi.org/10.1117/12.2664957

KEYWORDS: Antireflective coatings, Nanostructuring, Gallium antimonide, Zinc sulfide, Mid-IR, Long wavelength infrared, Staring arrays, Reflectivity, Refractive index, Reflection

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Proceedings Article | 15 June 2023 Presentation

Presentation

Development of graphene-enhanced HgCdTe photodetectors for uncooled mid-wave infrared detection

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Nibir Dhar, Samiran Ganguly, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 12514, 1251408 (2023) https://doi.org/10.1117/12.2665080

KEYWORDS: Mid-IR, Mercury cadmium telluride, Photodetectors, Sensors, Graphene, Remote sensing, Boron, X-rays, Spatial resolution, Space operations

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Proceedings Article | 17 March 2023 Presentation + Paper

Presentation + Paper

Towards compact fire infrared radiance spectral tracker (c-FIRST)

Sarath Gunapala, David Ting, William Johnson, Alexander Soibel, Perry Ramsey, Olga Kalashnikova, Michael Garay, Ashley Davies, Yuki Maruyama, Jessica Fisher, Ashok Sood, John Zeller, Christopher David, Sachidananda Babu, Parminder Ghuman

Proceedings Volume 12425, 1242509 (2023) https://doi.org/10.1117/12.2659034

KEYWORDS: Staring arrays, Fire, Equipment, Mid-IR, Quantum efficiency, Long wavelength infrared, Infrared radiation, Temperature metrology, Readout integrated circuits, Antireflective coatings

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Proceedings Article | 15 March 2023 Presentation + Paper

Presentation + Paper

High-performance graphene-enhanced HgCdTe photodetectors for uncooled mid-wave infrared sensing

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Nibir Dhar, Samiran Ganguly, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 12430, 124300U (2023) https://doi.org/10.1117/12.2656701

KEYWORDS: Graphene, Mercury cadmium telluride, Mid-IR, Photodetectors, Boron, Doping, Photocurrent, Dark current, Electrons, Chemical species

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Proceedings Article | 15 March 2023 Paper

Paper

Advanced detector performance from UV to IR with nanostructured antireflection coatings

Ashok Sood, John Zeller, Adam Sood, Parminder Ghuman, Sachidananda Babu, Sarath Gunapala, Alexander Soibel, David Ting, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 12430, 124301A (2023) https://doi.org/10.1117/12.2656534

KEYWORDS: Antireflective coatings, Nanostructuring, Gallium antimonide, Long wavelength infrared, Zinc sulfide, Refractive index, Reflectivity, Staring arrays, Ultraviolet radiation, Silicon

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Proceedings Article | 28 October 2022 Presentation + Paper

Presentation + Paper

Compact fire infrared radiance spectral tracker (c-FIRST)

Sarath Gunapala, David Ting, William Johnson, Alexander Soibel, Olga Kalashnikova, Michael Garay, Ashley Davies, Mehmet Ogut, Ashok Sood, John Zeller, Christopher David

Proceedings Volume 12264, 122640E (2022) https://doi.org/10.1117/12.2631509

KEYWORDS: Mid-IR, Infrared radiation, Sensors, Combustion, Short wave infrared radiation, Imaging systems, High dynamic range imaging, Earth sciences, Infrared search and track, Infrared detectors

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Proceedings Article | 11 October 2022 Presentation

Presentation

Development of T2SLS LWIR focal plane arrays for the Hyperspectral Thermal Imager (HyTI) (Conference Presentation)

Sarath Gunapala, David Ting, Sir Rafol, Alexander Soibel, Sam Keo, Arezou Khoshakhlagh, Brian Pepper, Anita Fisher, Cory Hill, Paul Lucey, Robert Wright, Miguel Nunes, Luke Flynn, Ashok Sood, Sachidananda Babu, Parminder Ghuman

Proceedings Volume PC12234, PC1223405 (2022) https://doi.org/10.1117/12.2631550

KEYWORDS: Staring arrays, Thermography, Hyperspectral imaging, Long wavelength infrared, Quantum efficiency, Superlattices, Nanotechnology, Infrared detectors, Earth sciences, Antireflective coatings

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Proceedings Article | 30 September 2022 Presentation + Paper

Presentation + Paper

Design and development of innovative vanadium oxide, CNT, and graphene based high-performance microbolometer

Ashok Sood, John Zeller, Usha Philipose, A. Syllaios, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 12234, 122340E (2022) https://doi.org/10.1117/12.2644037

KEYWORDS: Graphene, Microbolometers, Vanadium, Scanning electron microscopy, Silicon, Sputter deposition, Oxides, Long wavelength infrared, Temperature metrology

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Proceedings Article | 30 September 2022 Presentation + Paper

Presentation + Paper

Nanostructured antireflection coating technology for enhanced MWIR and LWIR band sensing performance

Ashok Sood, John Zeller, Adam Sood, Parminder Ghuman, Sachidananda Babu, Sarath Gunapala, Alex Soibel, David Ting, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 12234, 122340B (2022) https://doi.org/10.1117/12.2637896

KEYWORDS: Antireflective coatings, Nanostructuring, Gallium antimonide, Long wavelength infrared, Sensors, Reflectivity, Refractive index, Mid-IR

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Proceedings Article | 30 September 2022 Presentation + Paper

Presentation + Paper

High-performance graphene-enhanced HgCdTe mid-wave infrared photodetector development

John Zeller, Ashok Sood, Parminder Ghuman, Sachidananda Babu, Nibir Dhar, Samiran Ganguly, Randy Jacobs, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 12234, 122340C (2022) https://doi.org/10.1117/12.2637897

KEYWORDS: Graphene, Mercury cadmium telluride, Mid-IR, Sensors, Photodetectors, Infrared sensors, Doping, Boron, Electrons

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Proceedings Article | 31 May 2022 Presentation + Paper

Presentation + Paper

Development of high-performance graphene-HgCdTe detector technology for mid-wave infrared applications

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Nibir Dhar, Randy Jacobs, Samiran Ganguly, Sheikh Ahmed, Farjana Tonni, Avik Ghosh, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 12091, 1209108 (2022) https://doi.org/10.1117/12.2622239

KEYWORDS: Graphene, Sensors, Mercury cadmium telluride, Mid-IR, Photodetectors, Infrared sensors, Doping, Boron

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Proceedings Article | 30 May 2022 Presentation + Paper

Presentation + Paper

Improved UV to IR band detector performance through advanced nanostructured antireflection coatings

Ashok Sood, John Zeller, Adam Sood, Roger Welser, Parminder Ghuman, Sachidananda Babu, Sarath Gunapala, Alexander Soibel, David Ting, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 12091, 1209106 (2022) https://doi.org/10.1117/12.2622137

KEYWORDS: Antireflective coatings, Nanostructuring, Zinc, Gallium antimonide, Sensors, Long wavelength infrared, Reflectivity, Refractive index, Silicon, Ultraviolet radiation

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Proceedings Article | 30 May 2022 Presentation + Paper

Presentation + Paper

Mid-wavelength and long-wavelength infrared focal planes for smallsat applications

Sarath Gunapala, David Ting, Sir Rafol, Alexander Soibel, Arezou Khoshakhlagh, Sam Keo, Brian Pepper, Anita Fisher, Cory Hill, Thomas Pagano, Ashok Sood, John Zeller, Paul Lucey, Rob Wright, Miguel Nunes, Sachidananda Babu, Parminder Ghuman

Proceedings Volume 12091, 1209102 (2022) https://doi.org/10.1117/12.2619573

KEYWORDS: Staring arrays, Long wavelength infrared, Sensors, Quantum efficiency, Temperature metrology, Mid-IR, Infrared radiation, Readout integrated circuits, Antireflective coatings, Laser sintering

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Proceedings Article | 15 September 2021 Paper

Paper

Development of nanostructured antireflection coating technology for IR band for improved detector performance

Ashok Sood, John Zeller, Adam Sood, Roger Welser, Parminder Ghuman, Sachidananda Babu, Sarath Gunapala, Alexander Soibel, David Ting, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 11858, 1185812 (2021) https://doi.org/10.1117/12.2598994

KEYWORDS: Antireflective coatings, Nanostructuring, Reflectivity, Gallium antimonide, Long wavelength infrared, Refractive index, Sensors, Reflection

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Proceedings Article | 17 August 2021 Presentation + Paper

Presentation + Paper

Development of UV to IR band nanostructured antireflection coating technology for improved detector and sensor performance

Ashok Sood, John Zeller, Adam Sood, Roger Welser, Parminder Ghuman, Sachidananda Babu, Sarath Gunapala, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 11831, 1183109 (2021) https://doi.org/10.1117/12.2598993

KEYWORDS: Antireflective coatings, Nanostructuring, Reflectivity, Silicon, Gallium antimonide, Zinc, Mid-IR, Long wavelength infrared, Refractive index, Transmittance

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Proceedings Article | 11 August 2021 Presentation + Paper

Presentation + Paper

Development of high-performance graphene-HgCdTe detector technology for mid-wave infrared applications

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Nibir Dhar, Randy Jacobs, Samiran Ganguly, Avik Ghosh, Latika Chaudhary, Harry Efstathiads

Proceedings Volume 11831, 1183103 (2021) https://doi.org/10.1117/12.2598866

KEYWORDS: Graphene, Mercury cadmium telluride, Sensors, Mid-IR, Doping, Boron, Photodetectors, Interfaces, Raman spectroscopy, Infrared sensors

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Proceedings Article | 21 May 2021 Paper

Paper

Development of UV to IR band nanostructured antireflection coating technology for improved detector and sensor performance

Ashok Sood, Dr. John Zeller, Adam Sood, Roger Welser, Harry Efstathiadis, Parminder Ghuman, Sachidananda Babu, Sarath Gunapala

Proceedings Volume 11723, 117230F (2021) https://doi.org/10.1117/12.2591158

KEYWORDS: Antireflective coatings, Ultraviolet radiation, Nanostructuring, Sensors, Sensor performance, Nanotechnology, Infrared sensors, Detector development, UV optics, Reflection

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Proceedings Article | 21 May 2021 Paper

Paper

Development of high-performance graphene-HgCdTe detector technology for mid-wave infrared applications

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Nibir Dhar, Randy Jacobs, Samiran Ganguly, Avik Ghosh, Latika Chaudhary, Harry Efstathiadis

Proceedings Volume 11723, 117230I (2021) https://doi.org/10.1117/12.2590712

KEYWORDS: Graphene, Sensors, Mercury cadmium telluride, Mid-IR, Doping, Boron, Interfaces, Photodetectors, Chemical species, Infrared sensors

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Proceedings Article | 5 March 2021 Presentation + Paper

Presentation + Paper

Demonstration of uniform 6x6 GaN p-i-n UV avalanche photodiode arrays

Marzieh Bakhtiary-Noodeh, Minkyu Cho, Zhiyu Xu, Hoon Jeong, A. Nepomuk Otte, Shyh-Chiang Shen, Theeradetch Detchprohm, Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Russell Dupuis

Proceedings Volume 11686, 1168614 (2021) https://doi.org/10.1117/12.2576888

KEYWORDS: Gallium nitride, Ultraviolet radiation, Avalanche photodiodes, Avalanche photodetectors, Semiconducting wafers, Metalorganic chemical vapor deposition, Mass spectrometry, Ions, Dry etching

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Proceedings Article | 20 September 2020 Paper

Paper

GaN/AlGaN avalanche photodiode detector technology for high performance ultraviolet sensing applications

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Russell Dupuis

Proceedings Volume 11530, 115300Q (2020) https://doi.org/10.1117/12.2573387

KEYWORDS: Ultraviolet radiation, Avalanche photodiodes, Sensors, Defense technologies, UV optics, Earth sciences, Ultraviolet detectors, Metalorganic chemical vapor deposition, Gallium nitride, Computer engineering

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Proceedings Article | 20 September 2020 Paper

Paper

Development of UV to IR band nanostructured antireflection coating technology for improved detector and sensor performance

Ashok Sood, John Zeller, Gopal Pethuraja, Adam Sood, Roger Welser, Harry Efstathiadis, Parminder Ghuman, Sachidananda Babu, Sarath Gunapala

Proceedings Volume 11530, 115300R (2020) https://doi.org/10.1117/12.2571713

KEYWORDS: Antireflective coatings, Ultraviolet radiation, Nanostructuring, Sensors, Detector development, Nanotechnology, UV optics, Infrared radiation, Reflection, Optical components

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Proceedings Article | 20 September 2020 Paper

Paper

Development of high-performance graphene-HgCdTe detector technology for Mid-wave Infrared Applications

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Nibir Dhar, Samiran Ganguly, Avik Ghosh

Proceedings Volume 11530, 115300I (2020) https://doi.org/10.1117/12.2572904

KEYWORDS: Sensors, Mid-IR, Infrared sensors, Detector development, Mercury cadmium telluride, Graphene, Earth sciences, Photodetectors, Remote sensing, Night vision

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Proceedings Article | 22 August 2020 Paper

Paper

Development of UV to IR band nanostructured antireflection coating technology for improved detector performance

Ashok Sood, John Zeller, Gopal Pethuraja, Adam Sood, Roger Welser, Parminder Ghuman, Sachidananda Babu, Sarath Gunapala

Proceedings Volume 11503, 115030N (2020) https://doi.org/10.1117/12.2571233

KEYWORDS: Antireflective coatings, Nanostructuring, Silicon, Ultraviolet radiation, Reflection, Gallium antimonide, Refractive index, Sensors, Reflectivity

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Proceedings Article | 22 August 2020 Paper

Paper

GaN/AlGaN avalanche photodiode detector technology for high performance ultraviolet sensing applications

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Russell Dupuis

Proceedings Volume 11503, 115030L (2020) https://doi.org/10.1117/12.2571230

KEYWORDS: Gallium nitride, Avalanche photodetectors, Ultraviolet radiation, Sensors, Metalorganic chemical vapor deposition, Avalanche photodiodes, Ultraviolet detectors

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Proceedings Article | 22 August 2020 Paper

Paper

Development of high-performance graphene-HgCdTe detector technology for mid-wave infrared applications

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Nibir Dhar, Samiran Ganguly, Avik Ghosh

Proceedings Volume 11503, 115030M (2020) https://doi.org/10.1117/12.2571232

KEYWORDS: Sensors, Graphene, Mercury cadmium telluride, Mid-IR, Silicon, Interfaces, Photodetectors, Infrared sensors, Detector development

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Proceedings Article | 27 April 2020 Presentation

Presentation

Density functional theory based bandstructure analysis of graphene-HgCdTe heterostructure mid-wave infrared detector for Earth science applications (Conference Presentation)

Samiran Ganguly, Sheikh Ahmed, Avik Ghosh, Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Nibir Dhar

Proceedings Volume 11388, 1138803 (2020) https://doi.org/10.1117/12.2559001

KEYWORDS: Mid-IR, Sensors, Infrared sensors, Earth sciences, Heterojunctions, Mercury cadmium telluride, Sensor performance, Graphene, Photodetectors, Physics

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Proceedings Article | 10 March 2020 Presentation

Presentation

Quantum well solar cells incorporating thin barriers for improved efficiency (Conference Presentation)

Stephen Polly, Roger Welser, Mitsul Kacharia, Anastasiia Fedorenko, Ashok Sood, Seth Hubbard

Proceedings Volume 11275, 112750O (2020) https://doi.org/10.1117/12.2546778

KEYWORDS: Quantum wells, Solar cells, Quantum efficiency, Gallium arsenide, Absorption, Superlattices, Control systems, Photovoltaic materials, Indium gallium arsenide, Metalorganic chemical vapor deposition

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Proceedings Article | 10 October 2019 Presentation + Paper

Presentation + Paper

Development of high-performance detector technology for UV and IR applications

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Nibir Dhar, Samiran Ganguly, Avik Ghosh, Russell Dupuis

Proceedings Volume 11151, 1115113 (2019) https://doi.org/10.1117/12.2536257

KEYWORDS: Sensors, Mid-IR, Mercury cadmium telluride, Ultraviolet radiation, Graphene, Silicon, Gallium nitride, Infrared sensors, Photodetectors, Avalanche photodetectors

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Proceedings Article | 9 September 2019 Presentation + Paper

Presentation + Paper

Development of nanostructured antireflection coatings for infrared sensing applications

Ashok Sood, John Zeller, Adam Sood, Gopal Pethuraja, Roger Welser, Harry Efstathiadis, Anand Sampath, Nibir Dhar

Proceedings Volume 11129, 111290I (2019) https://doi.org/10.1117/12.2531642

KEYWORDS: Antireflective coatings, Nanostructuring, Infrared detection, Infrared technology, Long wavelength infrared, Roads, Optical components, Ultraviolet radiation, Night vision, Infrared sensors

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Proceedings Article | 9 September 2019 Presentation + Paper

Presentation + Paper

GaN/AlGaN avalanche photodiode detectors for high performance ultraviolet sensing applications

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Russell Dupuis

Proceedings Volume 11129, 111290F (2019) https://doi.org/10.1117/12.2531644

KEYWORDS: Ultraviolet radiation, Avalanche photodiodes, Sensors, Sensor performance, Defense technologies, UV optics, Earth sciences, Ultraviolet detectors, Metalorganic chemical vapor deposition, Gallium nitride

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Proceedings Article | 9 September 2019 Presentation + Paper

Presentation + Paper

Development of high-performance graphene-HgCdTe detector technology for mid-wave infrared applications

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Nibir Dhar, Samiran Ganguly, Avik Ghosh

Proceedings Volume 11129, 1112906 (2019) https://doi.org/10.1117/12.2531651

KEYWORDS: Sensors, Mid-IR, Infrared sensors, Detector development, Graphene, Earth sciences, Photodetectors, Remote sensing, Night vision, Computer engineering

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Proceedings Article | 13 May 2019 Paper

Paper

High performance GaN/AlGaN ultraviolet avalanche photodiode detector technologies

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Russell Dupuis

Proceedings Volume 10980, 109800M (2019) https://doi.org/10.1117/12.2521464

KEYWORDS: Ultraviolet radiation, Gallium nitride, Avalanche photodetectors, Metalorganic chemical vapor deposition, Sensors, Avalanche photodiodes, Ultraviolet detectors

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Proceedings Article | 13 May 2019 Paper

Paper

Broadband antireflection coatings for advanced sensing and imaging applications

Gopal Pethuraja, Adam Sood, John Zeller, Roger Welser, Ashok Sood, Harry Efstathiadis, Priyalal Wijewarnasuriya

Proceedings Volume 10980, 109800U (2019) https://doi.org/10.1117/12.2521463

KEYWORDS: Antireflective coatings, Nanostructuring, Transmittance, Glasses, Reflectivity, Refractive index, Coating, Sensors, Reflection, Multilayers

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Proceedings Article | 1 March 2019 Paper

Paper

Demonstration of uniform and reliable GaN p-i-p-i-n separate-absorption and multiplication ultraviolet avalanche photodiode arrays with large detection area

Mi-Hee Ji, Hoon Jeong, Marzieh Bakhtiary-Noodeh, Shyh-Chiang Shen, Theeradetch Detchprohm, Ashok Sood, P. Parminder Ghuman, Sachidananda Babu, Nibir Dhar, Jay Lewis, Russell Dupuis

Proceedings Volume 10918, 1091814 (2019) https://doi.org/10.1117/12.2507880

KEYWORDS: Gallium nitride, Avalanche photodiodes, Absorption, Ultraviolet radiation, Detector arrays, Metalorganic chemical vapor deposition, Back illuminated sensors, UV optics

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Proceedings Article | 18 September 2018 Presentation + Paper

Presentation + Paper

Development of high performance ultraviolet and near-infrared detector technologies

Ashok Sood, John Zeller, Parminder Ghuman, Sachidananda Babu, Russell Dupuis, Harry Efstathiadis

Proceedings Volume 10766, 1076609 (2018) https://doi.org/10.1117/12.2323642

KEYWORDS: Sensors, Ultraviolet radiation, Near infrared, Gallium nitride, Germanium, Photodetectors, Avalanche photodetectors, Metalorganic chemical vapor deposition, Detector development

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Proceedings Article | 18 September 2018 Presentation + Paper

Presentation + Paper

Nanostructured antireflection coatings for infrared sensors and applications

Gopal Pethuraja, John Zeller, Roger Welser, Ashok Sood, Harry Efstathiadis, Priyalal Wijewarnasuriya

Proceedings Volume 10766, 107660I (2018) https://doi.org/10.1117/12.2323702

KEYWORDS: Antireflective coatings, Nanostructuring, Transmittance, Glasses, Reflectivity, Silicon, Multilayers, Long wavelength infrared, Refractive index, Infrared sensors

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Proceedings Article | 19 September 2017 Presentation + Paper

Presentation + Paper

Development of nanostructured antireflection coatings for infrared technologies and applications

Gopal Pethuraja, John Zeller, Roger Welser, Harry Efstathiadis, Pradeep Haldar, Priyalal Wijewarnasuriya, Nibir Dhar, Ashok Sood

Proceedings Volume 10404, 104040S (2017) https://doi.org/10.1117/12.2277957

KEYWORDS: Antireflective coatings, Nanostructuring, Transmittance, Reflectivity, Glasses, Silicon, Multilayers, Infrared technology, Reflection, Refractive index

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Proceedings Article | 7 September 2017 Presentation + Paper

Presentation + Paper

Germanium photodetectors fabricated on 300 mm silicon wafers for near-infrared focal plane arrays

John Zeller, Caitlin Rouse, Harry Efstathiadis, Nibir Dhar, Priyalal Wijewarnasuriya, Ashok Sood

Proceedings Volume 10404, 104040H (2017) https://doi.org/10.1117/12.2277958

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Proceedings Article | 18 May 2017 Paper

Paper

Development of nanostructured antireflection coatings for infrared image sensing technologies

Gopal Pethuraja, John Zeller, Roger Welser, Ashok Sood, Harry Efstathiadis, Pradeep Haldar, Eric DeCuir, Priyalal Wijewarnasuriya, Nibir Dhar

Proceedings Volume 10209, 102090D (2017) https://doi.org/10.1117/12.2268856

KEYWORDS: Antireflective coatings, Nanostructuring, Transmittance, Glasses, Silicon, Reflectivity, Infrared imaging, Refractive index, Reflection, Infrared radiation

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Proceedings Article | 26 May 2016 Paper

Paper

Development of nanostructured antireflection coatings for EO/IR sensor applications

Gopal Pethuraja, Roger Welser, Ashok Sood, Harry Efstathiadis, Pradeep Haldar, Priyalal Wijewarnasuriya, Nibir Dhar

Proceedings Volume 9854, 985407 (2016) https://doi.org/10.1117/12.2229647

KEYWORDS: Nanorods, Antireflective coatings, Nanostructuring, Silica, Glasses, Silicon, Transmittance, Reflectivity, Refractive index, Sensors

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Proceedings Article | 26 May 2016 Paper

Paper

Overview of detector technologies for EO/IR sensing applications

Ashok Sood, John Zeller, Roger Welser, Yash Puri, Jay Lewis, Nibir Dhar, Priyalal Wijewarnasuriya

Proceedings Volume 9854, 98540A (2016) https://doi.org/10.1117/12.2229420

KEYWORDS: Zinc oxide, Sensors, Graphene, Ultraviolet radiation, Silica, Infrared sensors, Gallium nitride, Resistance, Nanostructures, Infrared radiation

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Proceedings Article | 26 May 2016 Paper

Paper

Development of graphene based detectors for EO/ IR applications

Ashok Sood, Isaac Lund, John Zeller, Yash Puri, Harry Efstathiadis, Pradeep Haldar, Nibir Dhar, Jay Lewis, Priyalal Wijewarnasuriya

Proceedings Volume 9854, 98540D (2016) https://doi.org/10.1117/12.2229649

KEYWORDS: Graphene, Doping, Infrared sensors, Field effect transistors, Infrared detectors, Sensors, Metals, Silicon, Oxides, Dielectrics

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Proceedings Article | 26 May 2016 Paper

Paper

Development of silicon-germanium visible-near infrared arrays

John Zeller, Caitlin Rouse, Harry Efstathiadis, Pradeep Haldar, Jay Lewis, Nibir Dhar, Priyalal Wijewarnasuriya, Yash Puri, Ashok Sood

Proceedings Volume 9854, 985408 (2016) https://doi.org/10.1117/12.2229650

KEYWORDS: Germanium, Silicon, Sensors, Photodetectors, Near infrared, Copper, Transmission electron microscopy, Doping, Indium gallium arsenide, Semiconducting wafers

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Proceedings Article | 17 May 2016 Paper

Paper

High efficiency nanostructured thin film solar cells for energy harvesting

Roger Welser, Ashok Sood, Jay Lewis, Nibir Dhar, Priyalal Wijewarnasuriya

Proceedings Volume 9865, 986505 (2016) https://doi.org/10.1117/12.2229652

KEYWORDS: Solar cells, Quantum wells, Photovoltaics, Gallium arsenide, Energy efficiency, Energy harvesting, Nanostructuring, Absorption, Diodes, Thin films

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Proceedings Article | 28 August 2015 Paper

Paper

Development of large area nanostructured antireflection coatings for EO/IR sensor applications

Ashok Sood, Gopal Pethuraja, Roger Welser, Yash Puri, Nibir Dhar, Priyalal Wijewarnasuriya, Jay Lewis, Harry Efsthadiatis, Pradeep Haldar, E. Schubert

Proceedings Volume 9609, 96090D (2015) https://doi.org/10.1117/12.2214877

KEYWORDS: Glasses, Antireflective coatings, Nanostructuring, Transmittance, Sensors, Silica, Refractive index, Semiconducting wafers, Reflection, Visible radiation

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Proceedings Article | 28 August 2015 Paper

Paper

Development of high gain avalanche photodiodes for UV imaging applications

Ashok Sood, John Zeller, Roger Welser, Yash Puri, Russell Dupuis, Mi-Hee Ji, Jeomoh Kim, Theeradetch Detchprohm, Nibir Dhar, Jay Lewis, Roy Peters

Proceedings Volume 9609, 96090X (2015) https://doi.org/10.1117/12.2193182

KEYWORDS: Gallium nitride, Ultraviolet radiation, Avalanche photodetectors, Sapphire, Avalanche photodiodes, Absorption, Cameras, UV optics, Crystals, Reliability

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Proceedings Article | 28 August 2015 Paper

Paper

Design and development of wafer-level near-infrared micro-camera

John Zeller, Caitlin Rouse, Harry Efstathiadis, Pradeep Haldar, Nibir Dhar, Jay Lewis, Priyalal Wijewarnasuriya, Yash Puri, Ashok Sood

Proceedings Volume 9609, 96090O (2015) https://doi.org/10.1117/12.2193179

KEYWORDS: Germanium, Sensors, Silicon, Photodetectors, Oxides, Near infrared, Transmission electron microscopy, Semiconducting wafers, Copper, Absorption

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Proceedings Article | 16 April 2015 Paper

Paper

Radiative dark current in optically thin III-V photovoltaic devices

Roger Welser, Ashok Sood, Sudersena Rao Tatavarti, Andree Wibowo, David Wilt, Alex Howard

Proceedings Volume 9358, 93580Q (2015) https://doi.org/10.1117/12.2185571

KEYWORDS: Quantum wells, Photovoltaics, Indium gallium arsenide, Diodes, Solar cells, External quantum efficiency, Thin films, Epitaxial lateral overgrowth, Gallium arsenide, Absorption

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Proceedings Article | 7 October 2014 Paper

Paper

Design and development of SiGe based near-infrared photodetectors

John Zeller, Yash Puri, Ashok Sood, Shane McMahon, Harry Efsthadiatis, Pradeep Haldar, Nibir Dhar

Proceedings Volume 9220, 922006 (2014) https://doi.org/10.1117/12.2083538

KEYWORDS: Germanium, Sensors, Silicon, Photodetectors, Near infrared, Semiconducting wafers, CMOS sensors, Absorption, CMOS technology, Scanning electron microscopy

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Proceedings Article | 23 June 2014 Paper

Paper

High-voltage thin-absorber photovoltaic device structures for efficient energy harvesting

Roger Welser, Gopal Pethuraja, John Zeller, Ashok Sood, Kimberly Sablon, Nibir Dhar

Proceedings Volume 9115, 91150F (2014) https://doi.org/10.1117/12.2053073

KEYWORDS: Gallium arsenide, Photovoltaics, Energy harvesting, Solar cells, Diodes, Photons, Epitaxial lateral overgrowth, Optical testing, Copper indium gallium selenide, Thin film devices

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Proceedings Article | 4 June 2014 Paper

Paper

Nanostructured detector technologies for optical sensing applications

Ashok Sood, Roger Welser, Yash Puri, Nibir Dhar, Dennis Polla, Priyalal Wijewarnasuriya, Madan Dubey

Proceedings Volume 9100, 91000N (2014) https://doi.org/10.1117/12.2058152

KEYWORDS: Zinc oxide, Ultraviolet radiation, Silica, Sensors, Gallium nitride, Resistance, Nanostructures, Scanning electron microscopy, Optical sensing, Temperature metrology

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Proceedings Article | 19 September 2013 Paper

Paper

Development of large area nanostructured AR coatings for EO/IR sensor applications

Ashok Sood, Gopal Pethuraja, Adam Sood, Roger Welser, Yash Puri, Pradeep Haldar, E. Fred Schubert, Nibir Dhar, Priyalal Wijewarnasuriya

Proceedings Volume 8868, 88680P (2013) https://doi.org/10.1117/12.2032206

KEYWORDS: Antireflective coatings, Nanostructuring, Glasses, Silica, Transmittance, Refractive index, Sensors, Reflection, Reflectivity, Nanorods

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Proceedings Article | 19 September 2013 Paper

Paper

Hetero-engineering infrared detectors with type-II superlattices

Z.-B. Tian, E. DeCuir, N. Gautam, S. Krishna, P. Wijewarnasuriya, J. Pattison, N. Dhar, R. Welser, A. Sood

Proceedings Volume 8868, 88680L (2013) https://doi.org/10.1117/12.2032205

KEYWORDS: Long wavelength infrared, Photodetectors, Gallium antimonide, Stereolithography, Optical instrument design, Superlattices, Quantum efficiency, Infrared detectors, Infrared radiation, Indium arsenide

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Proceedings Article | 19 September 2013 Paper

Paper

Development of III-N UVAPDs for ultraviolet sensor applications

Ashok Sood, Robert Richwine, Roger Welser, Yash Puri, Russell Dupuis, Mi-Hee Ji, Jeomoh Kim, Theeradetch Detchprohm, Nibir Dhar, Roy Peters

Proceedings Volume 8868, 88680T (2013) https://doi.org/10.1117/12.2032207

KEYWORDS: Ultraviolet radiation, Avalanche photodetectors, Signal to noise ratio, Pulsed laser operation, Ultraviolet detectors, Atmospheric modeling, Sensors, Target detection, Gallium nitride, Metalorganic chemical vapor deposition

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Proceedings Article | 19 September 2013 Paper

Paper

ZnMgO solar blind detectors: from material to systems

Mehdi Anwar, Abdiel Rivera, Anas Mazady, Hung Chi Chou, John Zeller, Ashok Sood

Proceedings Volume 8868, 88680B (2013) https://doi.org/10.1117/12.2032204

KEYWORDS: Zinc oxide, Ultraviolet radiation, Metalorganic chemical vapor deposition, Silica, Gallium nitride, Sensors, Scanning electron microscopy, Ultraviolet detectors, Sapphire, Nanowires

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Proceedings Article | 19 September 2013 Paper

Paper

Unleashing giant TCR from phase changes in carbon nanotube composites

Gustavo Fernandes, Jin Ho Kim, Jimmy Xu, Ashok Sood, Nibir Dhar, Madan Dubey

Proceedings Volume 8868, 88680S (2013) https://doi.org/10.1117/12.2028182

KEYWORDS: Composites, Resistance, Carbon nanotubes, Infrared detection, Bolometers, Polymers, Temperature metrology, Signal detection, Sensors, Infrared radiation

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Proceedings Article | 18 June 2013 Paper

Paper

Design and development of wafer-level short wave infrared micro-camera

Ashok Sood, Robert Richwine, Gopal Pethuraja, Yash Puri, Je-Ung Lee, Pradeep Haldar, Nibir Dhar

Proceedings Volume 8704, 870439 (2013) https://doi.org/10.1117/12.1518471

KEYWORDS: Short wave infrared radiation, Silicon, Staring arrays, Sensors, Signal processing, Infrared radiation, Infrared sensors, Infrared imaging, Interference (communication), Thermography

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Proceedings Article | 11 June 2013 Paper

Paper

Low-dark current structures for long-wavelength Type-II strained layer superlattice photodiodes

Zhaobing Tian, Eric DeCuir, Priyalal Wijewarnasuriya, James Pattison, Nutan Gautam, Sanjay Krishna , Nibir Dhar, Roger Welser , Ashok Sood

Proceedings Volume 8704, 870415 (2013) https://doi.org/10.1117/12.2015489

KEYWORDS: Long wavelength infrared, Stereolithography, Gallium antimonide, Photodetectors, Quantum efficiency, Interfaces, Antimony, Superlattices, Satellites, Infrared radiation

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Proceedings Article | 6 June 2013 Paper

Paper

ZnO nanowire growth and characterization for UV detection and imaging applications

Abdiel Rivera, M. Anas Mazady, John Zeller, Mehdi Anwar, Tariq Manzur, Ashok Sood

Proceedings Volume 8711, 871116 (2013) https://doi.org/10.1117/12.2020798

KEYWORDS: Zinc oxide, Ultraviolet radiation, Metalorganic chemical vapor deposition, Silica, Ultraviolet detectors, Gallium nitride, Sensors, Sapphire, Scanning electron microscopy, Nanowires

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Proceedings Article | 28 May 2013 Paper

Paper

Flexible, high-efficiency solar cells: approaches and advanced design concepts

Roger Welser, Gopal Pethuraja, Adam Sood, Ashok Sood, Pradeep Haldar, Nibir Dhar

Proceedings Volume 8728, 87280J (2013) https://doi.org/10.1117/12.2018073

KEYWORDS: Copper indium gallium selenide, Solar cells, Optical resonators, Photovoltaics, Reflectivity, Titanium, Thin films, Reflectors, Nanostructuring, Optical coatings

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Proceedings Article | 18 March 2013 Paper

Paper

MOCVD growth of ZnO nanowire arrays for advanced UV detectors

Abdiel Rivera, Anas Mazady, John Zeller, Mehdi Anwar, Tariq Manzur, Ashok Sood

Proceedings Volume 8626, 86260B (2013) https://doi.org/10.1117/12.2009247

KEYWORDS: Zinc oxide, Metalorganic chemical vapor deposition, Scanning electron microscopy, Ultraviolet detectors, Silica, Sapphire, Silicon, Ultraviolet radiation, Missiles, Nanowires

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SPIE Journal Paper | 3 December 2012

Long-wave type-II superlattice detectors with unipolar electron and hole barriers

Eric DeCuir, Gregory Meissner, Priyalal Wijewarnasuriya, Nutan Gautam, Sanjay Krishna, Nibir Dhar, Roger Welser, Ashok Sood

OE, Vol. 51, Issue 12, 124001, (December 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.12.124001

KEYWORDS: Diodes, Superlattices, Sensors, Diffusion, Quantum efficiency, FT-IR spectroscopy, Laser sintering, Long wavelength infrared, Infrared sensors, Infrared radiation

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Proceedings Article | 19 October 2012 Paper

Paper

Design and development of low dark current SLS detectors for IRFPA applications

Eric DeCuir, Nutan Gautam, Gregory Meissner, Priyalal Wijewarnasuriya, Sanjay Krishna, Nibir Dhar, Thomas Bramhall, Roger Welser, Ashok Sood

Proceedings Volume 8512, 85120N (2012) https://doi.org/10.1117/12.974237

KEYWORDS: Diodes, Sensors, Superlattices, Laser sintering, Diffusion, Infrared sensors, FT-IR spectroscopy, Quantum efficiency, Temperature metrology, Long wavelength infrared

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Proceedings Article | 19 October 2012 Paper

Paper

MOCVD growth and characterization of ZnO nanowire arrays for advanced ultraviolet detectors

Abdiel Rivera, John Zeller, Tariq Manzur, Ashok Sood, Mehdi Anwar

Proceedings Volume 8540, 854008 (2012) https://doi.org/10.1117/12.979218

KEYWORDS: Zinc oxide, Metalorganic chemical vapor deposition, Ultraviolet radiation, Signal to noise ratio, Ultraviolet detectors, Scanning electron microscopy, Sensors, Interference (communication), Sapphire, Nanowires

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Proceedings Article | 15 October 2012 Paper

Paper

Design and development of carbon nanotube and graphene based microbolometer for IR imaging applications

Ashok Sood, E. Egerton, Yash Puri, Neil Goldsman, Xi Shao, Akin Akturk, Nibir Dhar, Madan Dubey, Priyalal Wijewarnasuriya, Bobby Lineberry

Proceedings Volume 8512, 851205 (2012) https://doi.org/10.1117/12.974241

KEYWORDS: Bolometers, Graphene, Resistance, Microbolometers, Infrared radiation, Carbon nanotubes, Infrared bolometers, Infrared imaging, Sensors, Mid-IR

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Proceedings Article | 15 October 2012 Paper

Paper

Development of large area nanostructure antireflection coatings for EO/IR sensor applications

Ashok Sood, Gopal Pethuraja, Adam Sood, Roger Welser, Yash Puri, Jaehee Cho, E. Schubert, Nibir Dhar, Priyalal Wijewarnasuriya, Martin Soprano

Proceedings Volume 8512, 85120R (2012) https://doi.org/10.1117/12.974239

KEYWORDS: Antireflective coatings, Nanostructuring, Glasses, Silica, Transmittance, Refractive index, Sensors, Reflection, Reflectivity, Nanorods

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Proceedings Article | 31 May 2012 Paper

Paper

Design and development of carbon nanotube-based microbolometer for IR imaging applications

Ashok Sood, E. James Egerton, Yash Puri, Gustavo Fernandes, Jimmy Xu, Akin Akturk, Neil Goldsman, Nibir Dhar, Madan Dubey, Priyalal Wijewarnasuriya, Bobby Lineberry

Proceedings Volume 8353, 83533A (2012) https://doi.org/10.1117/12.923020

KEYWORDS: Resistance, Bolometers, Microbolometers, Nanostructures, Carbon, Thermography, Infrared radiation, Capacitance, Carbon nanotubes, Infrared imaging

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Proceedings Article | 25 May 2012 Paper

Paper

Quantum-structured III-V energy harvesting devices: pathways to ultra-high conversion efficiencies

Roger Welser, Ashok Sood, Nibir Dhar, Priyalal Wijewarnasuriya

Proceedings Volume 8377, 83770E (2012) https://doi.org/10.1117/12.922917

KEYWORDS: Indium gallium arsenide, Quantum wells, Indium, Gallium arsenide, Solar cells, Energy harvesting, Quantum efficiency, Diodes, Solar energy, Photovoltaics

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Proceedings Article | 23 May 2012 Paper

Paper

Development of small unit cell avalanche photodiodes for UV imaging applications

Ashok Sood, Roger Welser, Robert Richwine, Yash Puri, Russell Dupuis, Jae-Hyun Ryou, Nibir Dhar, P. Suvarna, F. Shahedipour-Sandvik

Proceedings Volume 8375, 83750R (2012) https://doi.org/10.1117/12.923182

KEYWORDS: Avalanche photodetectors, Ultraviolet radiation, Gallium nitride, Signal to noise ratio, Pulsed laser operation, Sensors, Atmospheric modeling, Target detection, Image resolution, Ultraviolet detectors

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Proceedings Article | 20 March 2012 Paper

Paper

Development of nanostructure based antireflection coatings for EO/IR sensor applications

Ashok Sood, Roger Welser, Adam Sood, Yash Puri, David Poxson, Jaehee Cho, E. Fred Schubert, Nibir Dhar, Martin Soprano, Raymond Balcerak

Proceedings Volume 8257, 82571C (2012) https://doi.org/10.1117/12.914374

KEYWORDS: Antireflective coatings, Sensors, Reflectivity, Silica, Near infrared, Transmittance, Glasses, Ultraviolet radiation, Nanowires, Nanorods

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Proceedings Article | 5 October 2011 Paper

Paper

EO/IR sensor development using nanostructures for unattended ground sensor applications

Ashok Sood, John Zeller, Yash Puri, Tariq Manzur, Nibir Dhar, Abdiel Rivera, A. F. M. Anwar, Gustavo Fernandes, J. M. Xu

Proceedings Volume 8184, 818408 (2011) https://doi.org/10.1117/12.903722

KEYWORDS: Sensors, Zinc oxide, Signal to noise ratio, Ultraviolet radiation, Nanostructures, Unattended ground sensors, Interference (communication), Solar energy, Dye sensitized solar cells, Nanowires

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Proceedings Article | 21 September 2011 Paper

Paper

High-voltage quantum well waveguide solar cells

Roger Welser, Gopal Pethuraja, Ashok Sood, Oleg Laboutin, Mark Chaplin, Van Un, Wayne Johnson, Adam Sood, David Poxson, Jaehee Cho, E. Fred Schubert, Pradeep Haldar, Jennifer Harvey

Proceedings Volume 8111, 81110I (2011) https://doi.org/10.1117/12.894682

KEYWORDS: Quantum wells, Indium gallium arsenide, Solar cells, Waveguides, Heterojunctions, Gallium arsenide, Diodes, Solar energy, Refractive index, Absorption

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Proceedings Article | 17 September 2011 Paper

Paper

Carbon nanotube based microbolometer development for IR imager and sensor applications

Ashok Sood, E. James Egerton, Yash Puri, Gustavo Fernandes, Jin Ho Kim, Jimmy Xu, Neil Goldsman, Nibir Dhar, Priyalal Wijewarnasuriya, Bobby Lineberry

Proceedings Volume 8155, 815513 (2011) https://doi.org/10.1117/12.895277

KEYWORDS: Resistance, Bolometers, Infrared sensors, Nanostructures, Sensors, Carbon nanotubes, Infrared radiation, Thermography, Imaging systems, Image sensors

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Proceedings Article | 16 September 2011 Paper

Paper

A review of growth and characterization of ZnO nanostructures for optoelectronic sensor and energy harvesting applications

Ashok Sood, John Zeller, Yash Puri, Nibir Dhar, Dennis Polla, Tariq Manzur, Zhong Wang, A. F. Mehdi Anwar

Proceedings Volume 8155, 815514 (2011) https://doi.org/10.1117/12.895287

KEYWORDS: Zinc oxide, Ultraviolet radiation, Nanostructures, Energy harvesting, Sensors, Photodetectors, Electrodes, Polymers, Ultraviolet detectors, Nanowires

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Proceedings Article | 16 September 2011 Paper

Paper

Avalanche photodiodes for high-resolution UV imaging applications

Ashok Sood, Robert Richwine, E. James Egerton, Yash Puri, Russell Dupuis, Nibir Dhar, Raymond Balcerak

Proceedings Volume 8155, 815509 (2011) https://doi.org/10.1117/12.895288

KEYWORDS: Ultraviolet radiation, Avalanche photodetectors, Signal to noise ratio, Pulsed laser operation, Interference (communication), Sensors, Target detection, Image resolution, Gallium nitride, Electrons

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Proceedings Article | 2 June 2011 Paper

Paper

Nanostructure based EO/IR sensor development for homeland security applications

Ashok Sood, Roger Welser, Adam Sood, Yash Puri, Tariq Manzur, Nibir Dhar, Dennis Polla, Zhong Wang, Priyalal Wijewarnasuriya, A. F. M. Anwar

Proceedings Volume 8019, 801914 (2011) https://doi.org/10.1117/12.888086

KEYWORDS: Sensors, Zinc oxide, Ultraviolet radiation, Signal to noise ratio, Nanostructures, Homeland security, Solar energy, Infrared sensors, Staring arrays, Nanowires

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Proceedings Article | 24 May 2011 Paper

Paper

Nanostructure-based EO/IR focal plane array development for unattended ground sensor applications

Ashok Sood, E. James Egerton, Robert Richwine, Yash Puri, Tariq Manzur, Nibir Dhar, Dennis Polla, Zhong L. Wang, Gustavo Fernandes, Jimmy Xu, Priyalal Wijewarnasuriya, A. F. M. Anwar

Proceedings Volume 8046, 80460N (2011) https://doi.org/10.1117/12.888125

KEYWORDS: Zinc oxide, Sensors, Ultraviolet radiation, Signal to noise ratio, Nanostructures, Unattended ground sensors, Staring arrays, Interference (communication), Solar energy, Nanowires

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Proceedings Article | 21 May 2011 Paper

Paper

Characterization of SiGe-detector arrays for visible-NIR imaging sensor applications

Ashok Sood, Robert Richwine, Adam Sood, Yash Puri, Nicole DiLello, Judy Hoyt, Tayo Akinwande, Nibir Dhar, Raymond Balcerak, Thomas Bramhall

Proceedings Volume 8012, 801240 (2011) https://doi.org/10.1117/12.889205

KEYWORDS: Sensors, Silicon, Signal to noise ratio, Diodes, Germanium, Semiconducting wafers, Staring arrays, Oxides, Photodiodes, Detector arrays

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Proceedings Article | 18 May 2011 Paper

Paper

Ultra-high transmittance through nanostructure-coated glass for solar cell applications

Roger Welser, Adam Sood, Ashok Sood, David Poxson, Sameer Chhajed, Jaehee Cho, E. Fred Schubert, Dennis Polla, Nibir Dhar

Proceedings Volume 8035, 80350X (2011) https://doi.org/10.1117/12.888129

KEYWORDS: Transmittance, Glasses, Refractive index, Silica, Antireflective coatings, Coating, Reflection, Solar cells, Thin films, Nanorods

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Proceedings Article | 18 May 2011 Paper

Paper

Quantum well and quantum dot energy harvesting devices

Roger Welser, Ashok Sood, Oleg Laboutin, Louis Guido, Nibir Dhar, Priyalal Wijewarnasuriya

Proceedings Volume 8035, 80351C (2011) https://doi.org/10.1117/12.888128

KEYWORDS: Indium gallium nitride, Solar cells, Quantum wells, Quantum dots, Photovoltaics, Gallium nitride, Quantum efficiency, Diodes, Energy harvesting, Solar energy

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Proceedings Article | 11 March 2011 Paper

Paper

Growth and characterization of ZnO nanostructures for UV sensor applications

Ashok Sood, E. James Egerton, Yash Puri, John Zeller, Tariq Manzur, Dennis Polla, Nibir Dhar, Jun Zhou, Sheng Xu, Su Zhang, Zhong Wang, A. F. Mehdi Anwar

Proceedings Volume 7940, 79400Z (2011) https://doi.org/10.1117/12.882583

KEYWORDS: Zinc oxide, Ultraviolet radiation, Nanostructures, Silicon, Atmospheric modeling, Sensors, Ultraviolet detectors, Solar radiation models, Gold, Nanowires

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Proceedings Article | 11 February 2011 Paper

Paper

Nanostructre based antireflection coatings for EO/IR sensor applications

Ashok Sood, Roger Welser, Adam Sood, E. James Egerton, Yash Puri, David Poxson, Sammer Chhajed Jaehee Cho, E. Fred Schubert, Dennis Polla, Nibir Dhar, Raymond Balcerak, Martin Soprano

Proceedings Volume 7954, 79540W (2011) https://doi.org/10.1117/12.882535

KEYWORDS: Antireflective coatings, Sensors, Silica, Reflectivity, Ultraviolet radiation, Near infrared, Refractive index, Visible radiation, Nanowires, Nanorods

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Proceedings Article | 31 August 2010 Paper

Paper

Development of GaN/AlGaN APDs for UV imaging applications

Ashok Sood, Robert Richwine, Yash Puri, Russell Dupuis, Jae-Hyun Ryou, Nibir Dhar, Raymond Balcerak

Proceedings Volume 7780, 77800E (2010) https://doi.org/10.1117/12.866361

KEYWORDS: Ultraviolet radiation, Avalanche photodetectors, Signal to noise ratio, Pulsed laser operation, Interference (communication), Sensors, Target detection, Gallium nitride, Electrons, Image resolution

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Proceedings Article | 31 August 2010 Paper

Paper

Development of SiGe arrays for visible-near IR applications

Ashok Sood, Robert Richwine, Yash Puri, Nicole DiLello, Judy Hoyt, Nibir Dhar, Raymond Balcerak, Thomas Bramhall

Proceedings Volume 7780, 77800F (2010) https://doi.org/10.1117/12.866362

KEYWORDS: Sensors, Silicon, Germanium, Signal to noise ratio, Staring arrays, Infrared sensors, Photodiodes, Diodes, Mercury cadmium telluride, Detector arrays

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Proceedings Article | 13 May 2010 Paper

Paper

Next generation nanostructure-based EO/IR focal plane arrays for unattended ground sensor applications

Ashok Sood, Robert Richwine, Yash Puri, Tariq Manzur, Nibir Dhar, Dennis Polla, Priyalal Wijewarnasuriya, Yaguang Wei, Jun Zhou, Cheng Li, Zhong Wang, Gustavo Fernandes, J. M. Jimmy Xu

Proceedings Volume 7693, 76930C (2010) https://doi.org/10.1117/12.852192

KEYWORDS: Sensors, Zinc oxide, Signal to noise ratio, Ultraviolet radiation, Nanostructures, Staring arrays, Interference (communication), Unattended ground sensors, Performance modeling, Nanowires

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Proceedings Article | 5 May 2010 Paper

Paper

Design and development of carbon nanostructure-based microbolometers for IR imagers and sensors

Ashok Sood, Robert Richwine, Yash Puri, Akin Akturk, Neil Goldsman, Siddharth Potbhare, Gustavo Fernandes, Chih-Hsun Hsu, Jin Ho Kim, Jimmy Xu, Nibir Dhar, Priyalal Wijewarnasuriya, Bobby Lineberry

Proceedings Volume 7679, 76791Q (2010) https://doi.org/10.1117/12.852730

KEYWORDS: Resistance, Bolometers, Nanostructures, Carbon, Sensors, Infrared sensors, Infrared radiation, Thermography, Imaging systems, Image sensors

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Proceedings Article | 5 May 2010 Paper

Paper

Nanostructure-based antireflection coatings for EO/IR sensor applications

Ashok Sood, Roger Welser, Yash Puri, David Poxson, Martin Schubert, Jaehee Cho, E. Fred Schubert, Dennis Polla, Martin Soprano

Proceedings Volume 7679, 76792G (2010) https://doi.org/10.1117/12.852706

KEYWORDS: Antireflective coatings, Sensors, Silica, Reflectivity, Ultraviolet radiation, Near infrared, Refractive index, Visible radiation, Nanowires, Nanorods

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Proceedings Article | 4 May 2010 Paper

Paper

Development of low dark current SiGe-detector arrays for visible-NIR imaging sensor

Ashok Sood, Robert Richwine, Yash Puri, Nicole DiLello, Judy Hoyt, Tayo Akinwande, Nibir Dhar, Stuart Horn, Raymond Balcerak, Thomas Bramhall

Proceedings Volume 7660, 76600L (2010) https://doi.org/10.1117/12.852682

KEYWORDS: Sensors, Silicon, Germanium, Signal to noise ratio, Staring arrays, Mercury cadmium telluride, Bolometers, Infrared sensors, Diodes, Doping

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Proceedings Article | 29 April 2010 Paper

Paper

High-efficiency InN-based quantum dot solar cells for defense applications

Roger Welser, Ashok Sood, Yash Puri, Oleg Laboutin, Louis Guido, Nibir Dhar, Priyalal Wijewarnasuriya

Proceedings Volume 7683, 76830R (2010) https://doi.org/10.1117/12.852764

KEYWORDS: Indium nitride, Quantum dots, Solar cells, Gallium nitride, Solar energy, Photovoltaics, Silicon, Ultraviolet radiation, Quantum efficiency, Metalorganic chemical vapor deposition

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Proceedings Article | 29 April 2010 Paper

Paper

GaAs-based quantum well solar cells for defense applications

Roger Welser, Ashok Sood, Yash Puri, Oleg Laboutin, Nibir Dhar, Priyalal Wijewarnasuriya

Proceedings Volume 7683, 76830Q (2010) https://doi.org/10.1117/12.852802

KEYWORDS: Solar cells, Gallium arsenide, Quantum wells, Indium gallium arsenide, Solar energy, Quantum efficiency, Heterojunctions, Indium gallium phosphide, Photovoltaics, Diodes

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Proceedings Article | 4 September 2009 Paper

Paper

Design and development of nanostructure based antireflection coatings for EO/IR sensor applications

Ashok Sood, Roger Welser, Yash Puri, Martin Schubert, David Poxson, Jong Kyu Kim, E. Fred Schubert, Dennis Polla, Martin Soprano

Proceedings Volume 7419, 74190U (2009) https://doi.org/10.1117/12.829899

KEYWORDS: Antireflective coatings, Coating, Sensors, Reflectivity, Silica, Near infrared, Ultraviolet radiation, Visible radiation, Nanowires, Nanorods

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Proceedings Article | 28 August 2009 Paper

Paper

Design considerations using APD detectors for high resolution UV imaging applications

Ashok Sood, Robert Richwine, Yash Puri, Stuart Horn, Raymond Balcerak

Proceedings Volume 7419, 74190V (2009) https://doi.org/10.1117/12.829900

KEYWORDS: Ultraviolet radiation, Avalanche photodetectors, Signal to noise ratio, Sensors, Pulsed laser operation, Interference (communication), Image resolution, Target detection, Systems modeling, Gallium nitride

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Proceedings Article | 12 May 2009 Paper

Paper

EO/IR sensors development using zinc oxide and carbon nanostructures

Ashok Sood, Robert Richwine, Yash Puri, Dennis Polla, Nibir Dhar, Zhong Wang, J. M. Xu, Priyalal Wijewarnasuriya, Neil Goldsman, Martin Soprano, Bobby Lineberry

Proceedings Volume 7318, 731804 (2009) https://doi.org/10.1117/12.820502

KEYWORDS: Zinc oxide, Nanostructures, Sensors, Ultraviolet radiation, Carbon, Infrared sensors, Silicon carbide, Electrodes, Electrons, Nanowires

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Proceedings Article | 7 May 2009 Paper

Paper

Development of low dark current SiGe-detector arrays for visible-NIR imaging sensor

Ashok Sood, Robert Richwine, Yash Puri, Nicole DiLello, Judy Hoyt, Tayo Akinwande, Stuart Horn, Ray Balcerak, Gary Bulman, Rama Venkatasubramanian, Arvind D'Souza, Thomas Bramhall

Proceedings Volume 7298, 72983D (2009) https://doi.org/10.1117/12.820896

KEYWORDS: Silicon, Sensors, Signal to noise ratio, Semiconducting wafers, Germanium, Superlattices, Diodes, Etching, Staring arrays, Oxides

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Proceedings Article | 1 May 2009 Paper

Paper

Multispectral EO/IR sensor model for evaluating UV, visible, SWIR, MWIR and LWIR system performance

Ashok Sood, Robert Richwine, Yash Puri, Nibir Dhar, Dennis Polla, Priyalal Wijewarnasuriya

Proceedings Volume 7300, 73000H (2009) https://doi.org/10.1117/12.820899

KEYWORDS: Sensors, 3D modeling, Image sensors, Performance modeling, Data modeling, Staring arrays, Ultraviolet radiation, Thermal modeling, Signal to noise ratio, Nonuniformity corrections

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Proceedings Article | 26 August 2008 Paper

Paper

Microbolometer sensor model for performance predictions and real-time image generation of infrared scenes and targets

Robert Richwine, Yash Puri, Ashok Sood, Raymond Balcerak, Stuart Horn, Glenn Baker, Michael Wilson

Proceedings Volume 7055, 70550T (2008) https://doi.org/10.1117/12.801337

KEYWORDS: 3D modeling, Sensors, Minimum resolvable temperature difference, Bolometers, Performance modeling, Atmospheric modeling, Modulation transfer functions, Image sensors, Signal to noise ratio, Thermal modeling

Read Abstract +

Presented is a comprehensive, physics-based model for microbolometer detector and sensor performance prediction. The model combines equations found in the literature and various standard models that generate NETD, MRTD, 3-D noise statistics and atmosphere characteristics (MODTRAN-based), with a comprehensive microbolometer model and HgCdTe model developed by the author to provide an end-to-end detector/FPA/sensor analysis and design tool, as well as a realistic image sequence generation tool. The model characterizes the individual pixel element based on the structure used, the various layer thicknesses, the electrical and thermal characteristics of the bolometer material and the biasing and readout circuit, and uses these results to calculate response and noise, NEP and NETD. The NETD, MTF and MRTD are predicted from the optics, detector and readout. Predicted NETD has been compared and verified with values found in literature, results from other models, and to uncooled camera measurements. The MRTD prediction has been verified with camera measurements and with standard industry MRTD model outputs. The model also calculates atmospheric path radiance and transmittance for horizontal paths based on MODTRAN outputs for the LWIR band at altitudes from 0 to 10km and ranges from 1 to 50km for assessments of air-to-air engagement SNR's. The model in matlab utililizes a 3-D noise model to provide accurate realistic imagery used to present realistic sensor images and to further validate the NETD and MRTD routines.(1) Images at 30Hz and 60Hz have been generated for visual assessment by the user and have mirrored industry model results and real-time camera images for MRTD's for the temporal noise case. The model's 3-D noise generation feature allows the prediction of MRTD vs. frequency under any 3-D noise combination. This model provides an end-to-end performance prediction tool useful in bolometer element design, readout design and for system level trade studies.

Proceedings Article | 15 May 2008 Paper

Paper

Design considerations for SiGe-based near infrared imaging sensor

Ashok Sood, Robert Richwine, Yash Puri, Oluwamuyiwa Olubuyide, Nicole DiLello, Judy Hoyt, Tayo Akinwande, Raymond Balcerak, Stuart Horn, Thomas Bramhall, Daniel Radack

Proceedings Volume 6940, 69400M (2008) https://doi.org/10.1117/12.780768

KEYWORDS: Signal to noise ratio, Sensors, Germanium, Infrared sensors, Near infrared, Silicon, Diodes, Black bodies, Staring arrays, Indium gallium arsenide

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Proceedings Article | 30 April 2008 Paper

Paper

ZnO nanostructures for optoelectronic applications

Ashok Sood, Yash Puri, Wenjie Mai, Puxian Gao, Changshi Lao, Zhong Wang, Dennis Polla, Martin Soprano

Proceedings Volume 6959, 69591A (2008) https://doi.org/10.1117/12.784458

KEYWORDS: Zinc oxide, Gallium nitride, Polymers, Silicon carbide, Ultraviolet radiation, Nanostructures, Coating, Scanning electron microscopy, Optoelectronics, Nanowires

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Proceedings Article | 11 October 2007 Paper

Paper

A review of growth and characterization of ZnO nanostructures for various optical applications

Ashok Sood, Yash Puri, Changshi Lao, Wenjie Mai, Puxian Gao, Sheng Xu, Zhong Lin Wang, Dennis Polla, Martin Soprano, Nibir Dhar

Proceedings Volume 6768, 676803 (2007) https://doi.org/10.1117/12.747289

KEYWORDS: Zinc oxide, Nanostructures, Ultraviolet radiation, Raman spectroscopy, Silicon carbide, Gallium nitride, Phonons, Polymers, Solids, Nanowires

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Proceedings Article | 10 May 2007 Paper

Paper

Growth and characterization of ZnO nanowires for various sensor applications

Ashok Sood, Yash Puri, Puxian Gao, Wenjie Mai, Changsi Lao, Zhong Wang, Dennis Polla, Martin Soprano

Proceedings Volume 6556, 65561L (2007) https://doi.org/10.1117/12.720301

KEYWORDS: Zinc oxide, Silicon carbide, Silicon, Sensors, Gold, Ultraviolet radiation, Polymethylmethacrylate, Nanostructures, Coating, Nanowires

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Proceedings Article | 30 April 2007 Paper

Paper

EO/IR sensor model for evaluating multispectral imaging system performance

Robert Richwine, Ashok Sood, Raymond Balcerak, Ken Freyvogel

Proceedings Volume 6543, 65430W (2007) https://doi.org/10.1117/12.721222

KEYWORDS: Sensors, Signal to noise ratio, Atmospheric modeling, Mercury cadmium telluride, Short wave infrared radiation, Staring arrays, Mid-IR, Infrared sensors, Domes, Performance modeling

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Proceedings Article | 8 February 2007 Paper

Paper

Epitaxial growth and characterization of AlGaN/GaN HEMT devices on SiC substrates for RF applications

Ashok Sood, Yash Puri, Frederick Clarke, Jie Deng, James Hwang, Steven Brierley, M. Asif Khan, Amir Dabiran, Peter Chow, Oleg Laboutin, Roger Welser

Proceedings Volume 6473, 647318 (2007) https://doi.org/10.1117/12.704201

KEYWORDS: Field effect transistors, Semiconducting wafers, Silicon carbide, Metalorganic chemical vapor deposition, Gallium nitride, Aluminum, Reflectivity, Defense technologies, Wafer-level optics, Gallium

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Proceedings Article | 2 October 2006 Paper

Paper

Design and development of high quantum efficiency large area UV focal plane arrays for photon counting applications

E. Egerton, Ashok Sood, Robert Bell, Yash Puri, Jacob Roginsky, Melville Ulmer, Bruce Wessels, Timothy Cook

Proceedings Volume 6389, 63890R (2006) https://doi.org/10.1117/12.692774

KEYWORDS: Silicon, Gallium nitride, Ultraviolet radiation, Etching, Staring arrays, Microchannel plates, Photon counting, Sensors, Quantum efficiency, Ions

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Proceedings Article | 8 September 2006 Paper

Paper

A full-spectrum 3D noise-based infrared imaging sensor model

Robert Richwine, Ashok Sood, Yash Puri, Harry Heckathorn, Larry Wilson, Jules Goldspiel

Proceedings Volume 6297, 62970A (2006) https://doi.org/10.1117/12.682837

KEYWORDS: Sensors, 3D modeling, Staring arrays, Nonuniformity corrections, Data modeling, Motion models, Point spread functions, 3D image processing, Infrared sensors, Image sensors

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Proceedings Article | 7 September 2006 Paper

Paper

Design considerations of ROIC for single color LWIR and multicolor IR focal plane arrays

Ashok Sood, James Egerton, Yash Puri, Latika Becker, Timothy Cook, Fouad Kiamilev

Proceedings Volume 6294, 62940A (2006) https://doi.org/10.1117/12.684641

KEYWORDS: Readout integrated circuits, Sensors, Staring arrays, Mercury cadmium telluride, Long wavelength infrared, Amplifiers, Silicon, Photodiodes, CMOS sensors, Interference (communication)

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Proceedings Article | 17 May 2006 Paper

Paper

Development of high performance radiation hardened antireflection coatings for LWIR and multicolor IR focal plane arrays

Ashok Sood, Yash Puri, Latika Becker, Meimei Tidrow, Raymond Balcerak, Gregory Brill, Priyalal Wijewarnasuriya, Nibir Dhar, Paul Boieriu, Chad Fulk, Siva Sivananthan, Joseph Yehoda, Steve Finke

Proceedings Volume 6206, 620615 (2006) https://doi.org/10.1117/12.667812

KEYWORDS: Silicon, Antireflective coatings, Silicon films, Long wavelength infrared, Semiconducting wafers, Ozone, Staring arrays, Thin films, Coating, Diamond

Read Abstract +

Proceedings Article | 10 May 2006 Paper

Paper

Design and demonstration of ultra high speed fiber-optic links for EO/IR sensors for tethered robotic applications

Robert Bell, Ashok Sood, Yash Puri

Proceedings Volume 6201, 62011Z (2006) https://doi.org/10.1117/12.673309

KEYWORDS: Fiber optics, Transmitters, Sensors, Receivers, Vertical cavity surface emitting lasers, Robotics, Connectors, Fiber optics sensors, Multimode fibers, Optical fiber cables

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Proceedings Article | 3 March 2006 Paper

Paper

Growth and characterization of AlGaN/GaN epitaxial layers by MOCVD on SiC substrates for RF device applications

Ashok Sood, Rajwinder Singh, Yash Puri, Frederick Clarke, Oleg Laboutin, Paul Deluca, Roger Wesler, Jie Deng, James C. M. Hwang

Proceedings Volume 6121, 61210D (2006) https://doi.org/10.1117/12.651122

KEYWORDS: Field effect transistors, Semiconducting wafers, Etching, Gallium nitride, Metalorganic chemical vapor deposition, Resistance, Silicon carbide, Spatial light modulators, Reflectivity, Transistors

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Proceedings Article | 3 March 2006 Paper

Paper

Solar-blind AlGaN 256×256 p-i-n detectors and focal plane arrays

M. Reine, A. Hairston, P. Lamarre, K. Wong, S. Tobin, A. Sood, C. Cooke, M. Pophristic, S. Guo, B. Perez, R. Singh, C. Eddy, U. Chowdhury, M. Wong, R. Dupuis, T. Li, S. DenBaars

Proceedings Volume 6121, 61210R (2006) https://doi.org/10.1117/12.654793

KEYWORDS: Ultraviolet radiation, Quantum efficiency, Back illuminated sensors, Staring arrays, Photodiodes, Gallium nitride, PIN photodiodes, Readout integrated circuits, Aluminum, Sapphire

Read Abstract +

Proceedings Article | 23 February 2006 Paper

Paper

Solar-blind AlGaN 256x256 p-i-n detectors and focal plane arrays

M. Reine, A. Hairston, P. Lamarre, K. Wong, S. Tobin, A. Sood, C. Cooke, M. Pophristic, S. Guo, B. Peres, R. Singh, C. Eddy, U. Chowdhury, M. Wong, R. Dupuis, T. Li, S. DenBaars

Proceedings Volume 6119, 611901 (2006) https://doi.org/10.1117/12.653645

KEYWORDS: Ultraviolet radiation, Quantum efficiency, Staring arrays, Back illuminated sensors, Photodiodes, Gallium nitride, PIN photodiodes, Readout integrated circuits, Aluminum, Sapphire

Read Abstract +

Proceedings Article | 9 September 2005 Paper

Paper

Advances in multi-color large area focal plane array sensors for standoff detection

Ashok Sood, Yash Puri, Robert Richwine, Latika Becker, Nibir Dhar, Siva Sivanathan, Jerrold Zimmerman

Proceedings Volume 5881, 58810N (2005) https://doi.org/10.1117/12.639822

KEYWORDS: Staring arrays, Sensors, Mercury cadmium telluride, Long wavelength infrared, Mid-IR, Infrared sensors, Microbolometers, Imaging systems, Standoff detection, Silicon

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Proceedings Article | 4 November 2004 Paper

Paper

Design and Development of High Speed Fiber-Optic Transmit and Receive Network for Commercial and Military Applications

Ashok Sood, Sriraj Bhadra, Paul Smith, Yash Puri, Mitchell Cross, Jason Ueda, Rakesh Patel, Jiang Liu, Wayne Chang, George Simonis, David Plant, Andrew Kirk, Joshua Schwartz

Proceedings Volume 5556, (2004) https://doi.org/10.1117/12.560671

KEYWORDS: Fiber optics, Network architectures, Connectors, Transmitters, Receivers, Vertical cavity surface emitting lasers, Channel projecting optics, Fiber optic networks, Switches, Defense technologies

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Proceedings Article | 22 October 2004 Paper

Paper

Design and development of high-performance radiation-hardened antireflection coatings for LWIR HgCdTe focal plane arrays

Ashok Sood, E. James Egerton, Sriraj Bhadra, Yash Puri, Gregory Brill, Priyalal Wijewarnasuriya, Yuanping Chan, Nibir Dhar, Meimei Tidrow, Dave Christian, Paul LoVecchio

Proceedings Volume 5564, (2004) https://doi.org/10.1117/12.565138

KEYWORDS: Silicon, Antireflective coatings, Long wavelength infrared, Mercury cadmium telluride, Silicon films, Staring arrays, Diamond, Thin film coatings, Thin films, Detector arrays

Read Abstract +

Proceedings Article | 22 October 2004 Paper

Paper

Design and development of multicolor detector arrays

Ashok Sood, E. James Egerton, Yash Puri, Enrico Bellotti, Latika Becker, Raymond Balcerak, Siva Sivananthan

Proceedings Volume 5564, (2004) https://doi.org/10.1117/12.565140

KEYWORDS: Mercury cadmium telluride, Sensors, 3D modeling, Staring arrays, Arsenic, Chemical elements, Instrument modeling, Mercury, Detector arrays, Infrared detectors

Read Abstract +

Multi-color infrared (IR) focal planes are required for high performance sensor applications. These sensors will require multi-color focal plane arrays (FPA) that will cover various wavelengths of interest in MWIR/LWIR and LWIR/VLWIR bands. There has been a significant progress in HgCdTe detector technology for multi-color MWIR/LWIR and LWIR/VLWIR focal plane arrays [1,2,3]. Two-color IR FPA eliminate the complexity of multiple single-color IR FPAs and provide a significant reduction of weight and power in a simpler, reliable and affordable systems. The complexity of multicolor IR detector MWIR/LWIR makes the device optimization by trial and error not only impractical but also merely impossible. Too many different geometrical and physical variables need to be considered at the same time. Additionally material characteristics are only relatively controllable and depend on the process repeatability. In this context the ability of performing simulation experiments where only one or a few parameters are carefully controlled is paramount for a quantum improvement of a new generation of multicolor detectors for various applications. Complex multi-color detector pixels cannot be designed and optimized by using a conventional 1D models. Several additional physical phenomena need to be taken into account. In designing a conventional photovoltaic IR detector array, a trade off exists on the choice of the pixel pitch, the pixel area and its height. The main goal of the device optimization is to reduce the pixel cross talk while keeping a high filling factor and detection efficiency. If the pixel height is made comparable to the lateral pixel dimension the contribution of the lateral photocurrent and lateral generation-recombination current becomes relevant and a full 2D simulation needs to be performed. It also important to point out that the few attempts to perform 2D simulations have reached the conclusion that for advanced IR arrays a full 3D approach should be used. The most challenging aspect of the array design and simulation is the pixel cross-talk effects. Since this is caused by the interaction with the four nearest neighboring pixels, even a description based on a 2D simulation model in most cases is not adequate. It is consequently important to include results from 3D simulation models as a guide to build lower dimensionality models.

Proceedings Article | 20 October 2004 Paper

Paper

Development of high-performance AlGaN/GaN high-electron mobility transistors for RF applications

Ashok Sood, Elwood Egerton, Yash Puri, Frederick Clarke, James Hwang, Amir Dabiran, Peter Chow, Tom Anderson, Avi Gupta, Andy Souzis, Ilya Zwieback

Proceedings Volume 5550, (2004) https://doi.org/10.1117/12.561584

KEYWORDS: Field effect transistors, Silicon carbide, Gallium nitride, Crystals, Semiconducting wafers, Transistors, Silicon, Doping, Gallium arsenide, Amplifiers

Read Abstract +

Proceedings Article | 1 November 1990 Paper

Paper

Automation of IRFPA production processes

James Egerton, Nancy Dieselman, William Higgins, Peter Zimmermann, Ashok Sood

Proceedings Volume 1339, (1990) https://doi.org/10.1117/12.23026

KEYWORDS: Manufacturing, Staring arrays, Sensors, Liquid phase epitaxy, Mercury cadmium telluride, Silicon, Infrared radiation, Wafer manufacturing, Control systems, Process control

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Showing 5 of 121 publications

Proceedings Volume Editor (17)

SPIE Conference Volume | 31 October 2023

Infrared Sensors, Devices, and Applications XIII

SPIE Conference Volume | 19 October 2022

Infrared Sensors, Devices, and Applications XII

SPIE Conference Volume | 17 August 2021

Infrared Sensors, Devices, and Applications XI

SPIE Conference Volume | 24 September 2020

Infrared Sensors, Devices, and Applications X

SPIE Conference Volume | 4 November 2019

Infrared Sensors, Devices, and Applications IX

Showing 5 of 17 publications

Conference Committee Involvement (54)

Infrared Sensors, Devices, and Applications XIV

20 August 2024 | San Diego, California, United States

Image Sensing Technologies: Materials, Devices, Systems, and Applications XI

22 April 2024 | National Harbor, Maryland, United States

Energy Harvesting and Storage: Materials, Devices, and Applications XIV

22 April 2024 | National Harbor, Maryland, United States

Infrared Sensors, Devices, and Applications XIII

22 August 2023 | San Diego, California, United States

Energy Harvesting and Storage: Materials, Devices, and Applications XIII

2 May 2023 | Orlando, Florida, United States

Image Sensing Technologies: Materials, Devices, Systems, and Applications X

1 May 2023 | Orlando, Florida, United States

Infrared Sensors, Devices, and Applications XII

24 August 2022 | San Diego, California, United States

Energy Harvesting and Storage: Materials, Devices, and Applications XII

5 April 2022 | Orlando, Florida, United States

Image Sensing Technologies: Materials, Devices, Systems, and Applications IX

4 April 2022 | Orlando, Florida, United States

Infrared Sensors, Devices, and Applications XI

4 August 2021 | San Diego, California, United States

Image Sensing Technologies: Materials, Devices, Systems, and Applications VIII

12 April 2021 | Online Only, Florida, United States

Energy Harvesting and Storage: Materials, Devices, and Applications XI

12 April 2021 | Online Only, Florida, United States

Infrared Sensors, Devices, and Applications X

24 August 2020 | Online Only, California, United States

Image Sensing Technologies: Materials, Devices, Systems, and Applications VII

27 April 2020 | Online Only, California, United States

Energy Harvesting and Storage: Materials, Devices, and Applications X

27 April 2020 | Online Only, California, United States

Infrared Sensors, Devices, and Applications IX

14 August 2019 | San Diego, California, United States

Image Sensing Technologies: Materials, Devices, Systems, and Applications VI

15 April 2019 | Baltimore, MD, United States

Energy Harvesting and Storage: Materials, Devices, and Applications IX

15 April 2019 | Baltimore, MD, United States

Infrared Sensors, Devices, and Applications VIII

22 August 2018 | San Diego, California, United States

Image Sensing Technologies: Materials, Devices, Systems, and Applications V

16 April 2018 | Orlando, FL, United States

Energy Harvesting and Storage: Materials, Devices, and Applications VIII

15 April 2018 | Orlando, FL, United States

Infrared Sensors, Devices, and Applications VII

9 August 2017 | San Diego, California, United States

Infrared Sensors, Devices, and Applications VI

31 August 2016 | San Diego, California, United States

Energy Harvesting and Storage: Materials, Devices, and Applications VII

19 April 2016 | Baltimore, MD, United States

Terahertz Physics, Devices, and Systems X: Advanced Applications in Industry and Defense

17 April 2016 | Baltimore, MD, United States

Infrared Sensors, Devices, and Applications V

12 August 2015 | San Diego, California, United States

Terahertz Physics, Devices, and Systems IX: Advanced Applications in Industry and Defense

22 April 2015 | Baltimore, MD, United States

Energy Harvesting and Storage: Materials, Devices, and Applications VI

21 April 2015 | Baltimore, MD, United States

Infrared Sensors, Devices, and Applications IV

18 August 2014 | San Diego, California, United States

Terahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense

5 May 2014 | Baltimore, MD, United States

Energy Harvesting and Storage: Materials, Devices, and Applications V

5 May 2014 | Baltimore, MD, United States

Infrared Sensors, Devices, and Applications III

26 August 2013 | San Diego, California, United States

Terahertz Physics, Devices, and Systems VII: Advanced Applications in Industry and Defense

29 April 2013 | Baltimore, Maryland, United States

Energy Harvesting and Storage: Materials, Devices, and Applications IV

29 April 2013 | Baltimore, Maryland, United States

Infrared Sensors, Devices, and Applications II

14 August 2012 | San Diego, California, United States

Energy Harvesting and Storage: Materials, Devices, and Applications III

23 April 2012 | Baltimore, Maryland, United States

Terahertz Physics, Devices, and Systems VI: Advance Applications in Industry and Defense

23 April 2012 | Baltimore, Maryland, United States

Infrared Sensors, Devices, and Applications

23 August 2011 | San Diego, California, United States

Energy Harvesting and Storage: Materials, Devices, and Applications II

25 April 2011 | Orlando, Florida, United States

Infrared Detector Devices and Photoelectronic Imagers V

5 August 2010 | San Diego, California, United States

Micro- and Nanotechnology Sensors, Systems, and Applications II

5 April 2010 | Orlando, Florida, United States

Infrared Detector Devices and Photoelectronic Imagers IV

5 August 2009 | San Diego, California, United States

Micro- and Nanotechnology Sensors, Systems, and Applications

15 April 2009 | Orlando, Florida, United States

Optics and Photonics in Global Homeland Security V

14 April 2009 | Orlando, Florida, United States

Infrared and Photoelectronic Imagers and Detector Devices III

11 August 2008 | San Diego, California, United States

Micro (MEMS) and Nanotechnologies for Space, Defense, and Security II

18 March 2008 | Orlando, Florida, United States

Optics and Photonics in Global Homeland Security IV

17 March 2008 | Orlando, Florida, United States

Infrared and Photoelectronic Imagers and Detectors III

26 August 2007 | San Diego, California, United States

Optics and Photonics in Global Homeland Security III

10 April 2007 | Orlando, Florida, United States

Infrared and Photoelectronic Imagers and Detector Devices II

13 August 2006 | San Diego, California, United States

Optics and Photonics in Global Homeland Security II

19 April 2006 | Orlando (Kissimmee), Florida, United States

Optics and Photonics in Global Homeland Security

29 March 2005 | Orlando, Florida, United States

Infrared Detector Materials and Devices

4 August 2004 | Denver, Colorado, United States

Optics and Photonics in Global Homeland Security 2003

2 December 2003 | Washington, DC, United States

Showing 5 of 54 Conference Committees

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