Prof. Juejun Hu Profile

Prof. Juejun Hu

Professor at Massachusetts Institute of Technology

SPIE Involvement:

Conference Program Committee | Editorial Board Member: Journal of Optical Microsystems | Author | Special Event Speaker

Publications (73)

Proceedings Article | 13 March 2024 Presentation

Multifunctional metasurface flat optics for imaging and sensing

Fan Yang, Hung-I Lin, Juejun Hu, Tian Gu

Proceedings Volume PC12896, PC128960V (2024) https://doi.org/10.1117/12.3012807

KEYWORDS: Flat optics, Wavefronts, Nanoantennas

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Proceedings Article | 13 March 2024 Presentation + Paper

Monolithic beam combined quantum cascade laser arrays with integrated arrayed waveguide gratings

Tushar Sanjay Karnik, Laurent Diehl, Khoi Phuong Dao, Qingyang Du, Christian Pfluegl, Daryoosh Vakhshoori, Juejun Hu

Proceedings Volume 12905, 129050L (2024) https://doi.org/10.1117/12.3000223

KEYWORDS: Quantum cascade lasers, Arrayed waveguide gratings, Mid infrared

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Proceedings Article | 13 March 2024 Presentation

Advancing metasurfaces towards new frontiers: nonvolatile reconfigurable optics

Hyun Jung Kim, Kiumars Aryana, Scott Bartram, Stephen Borg, William Humphreys, Cosmin-Constantin Popescu, Steven Vitale, Hyung Bin Bae, Taewoo Lee, Tian Gu, Juejun Hu

Proceedings Volume PC12896, PC128960D (2024) https://doi.org/10.1117/12.2692087

KEYWORDS: Free space optics, Transmission electron microscopy, Interfaces, Fabrication, Design and modelling, Circuit switching, Adaptive optics, Thermal modeling, Temperature distribution, Spectroscopes

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Proceedings Article | 13 March 2024 Presentation + Paper

Deep learning-based approach for multi-functional fabrication-friendly metasurfaces

Akira Ueno, Hung-I Lin, Fan Yang, Sensong An, Louis Martin-Monier, Mikhail Shalaginov, Tian Gu, Juejun Hu

Proceedings Volume 12897, 1289708 (2024) https://doi.org/10.1117/12.3002724

KEYWORDS: Design, Fabrication, Collimators, Neural networks, Beam divergence, Manufacturing, Deep learning, Metalenses

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Proceedings Article | 9 March 2024 Presentation

Scaling up phase change material-based devices: expanding dimensions for adaptive optics

Kiumars Aryana, Hyun Jung Kim, Cosmin-Constantin Popescu, Steven Vitale, Hyung Bin Bae, Taewoo Lee, Tian Gu, Juejun Hu

Proceedings Volume PC12890, PC128900W (2024) https://doi.org/10.1117/12.2692982

KEYWORDS: Adaptive optics, Circuit switching, Thermal modeling, Switching, Power consumption, Photonic integrated circuits, Optical discs, Optical components, Instrument modeling, Glasses

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Proceedings Article | 28 June 2023 Open Access

The Massachusetts LEAP network: building a template for a hands-on advanced manufacturing hub in integrated photonics

Drew Weninger, Samuel Serna, Sajan Saini, Luigi Ranno, Erik Verlage, Samuel Bechtold, Pablo Bedoya-Rios, Juejun Hu, Lionel Kimerling, Anuradha Agarwal

Proceedings Volume 12723, 127231Y (2023) https://doi.org/10.1117/12.2670834

KEYWORDS: Integrated photonics, Virtual reality, Education and training, Manufacturing, Photonics, Industry, Design and modelling, Tolerancing, Prototyping, Photonic integrated circuits

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Proceedings Article | 15 June 2023 Presentation

Dynamic light shaping using active optical metasurfaces

Fan Yang, Cosmin-Constantin Popescu, Carlos Ríos Ocampo, Yifei Zhang, Mikhail Shalaginov, Hung-I Lin, Sensong An, Hyun Jung Kim, Matthew Julian, Calum Williams, Kiumars Aryana, Scott Bartram, Stephen Borg, William Humphreys, Clara Rivero-Baleine, Paul Miller, Christopher Roberts, Steven Vitale, Hualiang Zhang, Juejun Hu, Tian Gu

Proceedings Volume PC12514, PC125140A (2023) https://doi.org/10.1117/12.2664410

KEYWORDS: Active optics, Optical components, Nanoantennas, Integrated optics

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Proceedings Article | 15 June 2023 Presentation

P-ACTIVE (PCM-based actively tunable filter) project at NASA

Hyun Jung Kim, Stephen Borg, Scott Bartram, William Humphreys, Juejun Hu, Tian Gu, Matthew Julian, Calum Williams

Proceedings Volume PC12514, PC1251403 (2023) https://doi.org/10.1117/12.2655485

KEYWORDS: Tunable filters, Thermal sensing, Space operations, Optical filters, Mid-IR, Lead, Infrared signatures, Image filtering, Chemical species, Biological and chemical sensing

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Proceedings Article | 14 June 2023 Presentation + Paper

Wide field-of-view long-wave infrared metalenses

Hung-I Lin, Jeffrey Geldmeier, Erwan Baleine, Fan Yang, Sensong An, Clara Rivero-Baleine, Tian Gu, Juejun Hu

Proceedings Volume 12530, 125300I (2023) https://doi.org/10.1117/12.2661943

KEYWORDS: Zinc selenide, Thermography, Long wavelength infrared, Design and modelling, Silicon, Metalenses, Transmittance, Semiconducting wafers, Modulation transfer functions, Deep reactive ion etching

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SPIE Journal Paper | 23 May 2023 Open Access

Wide field-of-view metalens: a tutorial

Fan Yang, Mikhail Shalaginov, Hung-I Lin, Sensong An, Anu Agarwal, Hualiang Zhang, Clara Rivero-Baleine, Tian Gu, Juejun Hu

AP, Vol. 5, Issue 03, 033001, (May 2023) https://doi.org/10.1117/12.10.1117/1.AP.5.3.033001

KEYWORDS: Design and modelling, Metalenses, Lenses, Monochromatic aberrations, Lens design, Distortion, Photonics, Imaging systems, Chromatic aberrations, Solids

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Proceedings Article | 17 March 2023 Poster

Nonvolatile band switching using transparent phase-change materials on Bragg structures

Nicholas Nobile, Chuanyu Lian, Hongyi Sun, Brian Mills, Cosmin Constantin Popescu, Juejun Hu, Carlos Ríos, Nathan Youngblood

Proceedings Volume PC12424, PC124240U (2023) https://doi.org/10.1117/12.2647868

KEYWORDS: Switching, Waveguides, Phase shift keying, Resonators, Refractive index, Modulation, Bragg gratings, Wavelength division multiplexing, Photons, Optical components

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Proceedings Article | 17 March 2023 Presentation

Phase change reconfigurable optical wavefront synthesis system

Hyun Jung Kim, Kiumars Aryana, Scott Bartram, Stephen Borg, William Humphreys, Cosmin-Constantin Popescu, Tian Gu, Juejun Hu, Steven Vitale

Proceedings Volume PC12432, PC124320N (2023) https://doi.org/10.1117/12.2647764

KEYWORDS: Wavefronts, Silicon, Tunable filters, Switching, Sensors, Remote sensing, Optical fabrication equipment, Optical fabrication, Optical communications, Light scattering

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Proceedings Article | 17 March 2023 Presentation

Fisheye-metalens stereo camera

Mikhail Shalaginov, Hung-I Lin, Fan Yang, Drew Weninger, Sensong An, Anuradha Agarwal, Juejun Hu, Tian Gu

Proceedings Volume PC12432, PC124320R (2023) https://doi.org/10.1117/12.2650997

KEYWORDS: Stereoscopic cameras, Sensors, Panoramic photography, Image resolution, Diffraction, Three dimensional sensing, Silica, Robotics, Optical components, Mixed reality

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Proceedings Article | 15 March 2023 Presentation + Paper

Metasurface optics enabled computational sensing

Fan Yang, Hung-I Lin, Mikhail Shalaginov, Juejun Hu, Tian Gu

Proceedings Volume 12438, 1243808 (2023) https://doi.org/10.1117/12.2647615

KEYWORDS: Point spread functions, Polarization, Design and modelling, Image deconvolution, Wavefronts, Optical sensing, Transmittance, Signal intensity, Prior knowledge, Incident light

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Proceedings Article | 15 March 2023 Presentation + Paper

Learning from failure: boosting cycling endurance of optical phase change materials

Cosmin-Constantin Popescu, Steven Vitale, Christopher Roberts, Paul Miller, Kiumars Aryana, Myungkoo Kang, Kathleen Richardson, Hyun Jung Kim, William Humphreys, Tian Gu, Juejun Hu

Proceedings Volume 12431, 124310B (2023) https://doi.org/10.1117/12.2657208

KEYWORDS: Photonics, Quantum photonics, Lithium, Switching, Optical switching, Chalcogenides, Silicon, Crystals, Phase shift keying, Transistors

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Proceedings Article | 6 March 2023 Presentation

High-performance, low-cost optical coherence tomography (OCT) on a silicon photonic chip platform

Diana Mojahed, Maarten Peters, Juejun Hu

Proceedings Volume PC12374, PC1237406 (2023) https://doi.org/10.1117/12.2650916

KEYWORDS: Optical coherence tomography, Silicon photonics, Spectroscopy, Spectral resolution, Waveguides, Spectrometer engineering, Scanners, Phased array optics, Optical switching, Interferometers

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Proceedings Article | 3 October 2022 Presentation + Paper

New phase change materials for active photonics

Cosmin Constantin-Popescu, Mikhail Shalaginov, Fan Yang, Hung-I Lin, Sensong An, Christopher Roberts, Paul Miller, Myungkoo Kang, Kathleen Richardson, Hualiang Zhang, Clara Rivero-Baleine, Hyun Jung Kim, Tian Gu, Steven Vitale, Juejun Hu

Proceedings Volume 12196, 1219606 (2022) https://doi.org/10.1117/12.2631038

KEYWORDS: Crystals, Photonics, Switching, Lithium, Absorption, Photonic crystals, Electronics, Refractive index, Germanium, Chalcogenides

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Proceedings Article | 3 October 2022 Presentation + Paper

Ultra-low energy programmable non-volatile silicon photonics based on phase-change materials with graphene heaters

Zhuoran Fang, Rui Chen, Jiajiu Zheng, Asir Intisar Khan, Kathryn Neilson, Sarah Geiger, Dennis Callahan, Michael Moebius, Abhi Saxena, Michelle Chen, Carlos Rios, Juejun Hu, Eric Pop, Arka Majumdar

Proceedings Volume 12196, 1219602 (2022) https://doi.org/10.1117/12.2632208

KEYWORDS: Graphene, Phase shifts, Switching, Silicon photonics, Waveguides, Switches, Microrings, Photonics, Wavelength tuning

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Proceedings Article | 3 October 2022 Presentation + Paper

Non-mechanical reconfigurable zoom metalenses

Fan Yang, Hung-I Lin, Mikhail Shalaginov, Katherine Stoll, Sensong An, Clara Rivero-Baleine, Myungkoo Kang, Anuradha Agarwal, Kathleen Richardson, Hualiang Zhang, Juejun Hu, Tian Gu

Proceedings Volume 12196, 1219605 (2022) https://doi.org/10.1117/12.2634252

KEYWORDS: Zoom lenses, Polarization, Lens design, Image quality, Waveguides, Mid-IR, Distortion, Telescopes, Optical components, Image sensors

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Proceedings Article | 3 October 2022 Open Access

Online collaborative approach to teaching hands-on photonic integrated circuit (PIC) device testing (Conference Presentation)

Juejun Hu, Jerome Michon, Mikhail Shalaginov, Gillian Micale, Jaime Cardenas, Jelena Notaros, Milica Notaros, Jifeng Liu, Samuel Serna, Pradnya Nagarkar, Lionel Kimerling, Anuradha Agarwal

Proceedings Volume PC12213, PC1221301 (2022) https://doi.org/10.1117/12.2633210

KEYWORDS: Photonic integrated circuits, Integrated photonics, Video, Modulators, Light sources, Design for manufacturing, Waveguides, Wafer testing, Visualization, Resonators

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Proceedings Article | 5 March 2022 Presentation

Phase-change-material (PCM)-based actively tunable filters for both terrestrial and spaceborne platforms

Hyun Jung Kim, Stephen Borg, William Humphreys, Matthew Julian, Calum Williams, David Bombara, Yifei Zhang, Juejun Hu, Tian Gu

Proceedings Volume PC12011, PC1201102 (2022) https://doi.org/10.1117/12.2607826

KEYWORDS: Tunable filters, Phase shift keying, Optical filters, Mid-IR, Solid state electronics, Optical components, Ultraviolet radiation, Ultrafast phenomena, Thin films, Thermography

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Proceedings Article | 5 March 2022 Presentation + Paper

Ultra-broadband, high-efficiency, and wafer-scale fiber-to-chip coupling using free-form micro-optical reflectors

Shaoliang Yu, Luigi Ranno, Qingyang Du, Samuel Serna, Colin McDonough, Nicholas Fahrenkopf, Tian Gu, Juejun Hu

Proceedings Volume 12006, 1200604 (2022) https://doi.org/10.1117/12.2605054

KEYWORDS: Waveguides, Reflectors, Tolerancing, Optical fibers, Photonics, Packaging, Fiber couplers, Integrated optics, Geometrical optics, Free space optics

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Proceedings Article | 5 March 2022 Presentation + Paper

Understanding wide field-of-view metalenses

Fan Yang, Mikhail Shalaginov, Sensong An, Hualiang Zhang, Tian Gu, Juejun Hu

Proceedings Volume 12011, 1201108 (2022) https://doi.org/10.1117/12.2607381

KEYWORDS: Monochromatic aberrations, Algorithm development, Optical components, Distortion, Colorimetry, Panoramic photography, Imaging systems, Chemical elements, Optimization (mathematics), Image resolution

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Proceedings Article | 3 March 2022 Presentation + Paper

Phase change materials: the 'silicon' for analog photonic computing?

Carlos Ríos, Yifei Zhang, Qingyang Du, Cosmin-Constantin Popescu, Mikhail Shalaginov, Paul Miller, Christopher Roberts, Myungkoo Kang, Kathleen Richardson, Tian Gu, Steven Vitale, Juejun Hu

Proceedings Volume 12019, 1201909 (2022) https://doi.org/10.1117/12.2613410

KEYWORDS: Switching, Silicon, Integrated photonics, Optical computing, Lithium, Antimony, Switches, Photonic devices, Chalcogenides, Silicon photonics

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Proceedings Article | 1 August 2021 Presentation

On-chip optical tweezers based on free-form optics

Jinsheng Lu, Shaoliang Yu, Vincent Ginis, Simon Kheifets, Soon Wei Daniel Lim, Min Qiu, Tian Gu, Juejun Hu, Federico Capasso

Proceedings Volume 11798, 117981O (2021) https://doi.org/10.1117/12.2594988

KEYWORDS: Optical tweezers, Freeform optics, Reflectivity, Optical design, Integrated optics, Waveguides, Two photon polymerization, Reflectors, Photonic integrated circuits, Particles

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Proceedings Article | 1 August 2021 Presentation + Paper

Electrically-switchable foundry-processed phase change photonic devices

Carlos Ríos, Yifei Zhang, Qingyang Du, Cosmin-Constantin Popescu, Mikhail Shalaginov, Paul Miller, Christopher Roberts, Myungkoo Kang, Kathleen Richardson, Sensong An, Clayton Fowler, Hualiang Zhang, Tian Gu, Steven Vitale, Juejun Hu

Proceedings Volume 11796, 117961Z (2021) https://doi.org/10.1117/12.2592021

KEYWORDS: Switching, Silicon, Antimony, Photonic devices, Waveguides, Phase shifts, Phase shift keying, Integrated photonics, Crystals, Switches

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SPIE Journal Paper | 26 January 2021 Open Access

Structurally and morphologically engineered chalcogenide materials for optical and photonic devices

Casey Schwarz, Stephen Kuebler, Clara Rivero-Baleine, Brandon Triplett, Myungkoo Kang, Quentin Altemose, Cesar Blanco, Kathleen Richardson, Qingyang Du, Skylar Deckoff-Jones, Juejun Hu, Yifei Zhang, Ying Pan, Carlos Ríos

JOM, Vol. 1, Issue 01, 013502, (January 2021) https://doi.org/10.1117/12.10.1117/1.JOM.1.1.013502

KEYWORDS: Tellurium, Selenium, Arsenic, Antimony, Etching, Germanium, Crystals, Optical lithography, GRIN lenses, Chalcogenides

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SPIE Journal Paper | 26 November 2020 Open Access

High spatial and temporal resolution synthetic aperture phase microscopy

Cheng Zheng, Di Jin, Yanping He, Hongtao Lin, Juejun Hu, Zahid Yaqoob, Peter T. So, Renjie Zhou

AP, Vol. 2, Issue 06, 065002, (November 2020) https://doi.org/10.1117/12.10.1117/1.AP.2.6.065002

KEYWORDS: Temporal resolution, Microscopy, Synthetic aperture microscopy, Video, Digital micromirror devices, Diffraction, Scanning electron microscopy, Objectives, Image resolution, Coherence imaging

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Proceedings Article | 12 October 2020 Presentation + Paper

Tunable infrared spectral imaging system

Christine Wang, Nolan Peard, Dennis Callahan, Joy Perkinson, Neil Patel, John LeBlanc, Qingyang Du, Takian Fakhrul, Caroline Ross, Juejun Hu

Proceedings Volume 11537, 1153703 (2020) https://doi.org/10.1117/12.2570591

KEYWORDS: Imaging systems, Infrared imaging, Infrared radiation, Imaging spectroscopy, Optical filters, Molybdenum, Infrared signatures, Polarizers, Long wavelength infrared, Thermography

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Proceedings Article | 20 August 2020 Presentation + Paper

Reconfigurable all-dielectric metalens for diffraction-limited imaging

Mikhail Shalaginov, Sensong An, Yifei Zhang, Fan Yang, Peter Su, Vladimir Liberman, Jeffrey Chou, Christopher Roberts, Myungkoo Kang, Carlos Rios, Qingyang Du, Clayton Fowler, Anuradha Agarwal, Kathleen Richardson, Clara Rivero-Baleine, Hualiang Zhang, Juejun Hu, Tian Gu

Proceedings Volume 11461, 114610M (2020) https://doi.org/10.1117/12.2565267

KEYWORDS: Active optics, Switching, Image resolution, Refractive index, Etching, Electron beam lithography

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Proceedings Article | 4 May 2020 Presentation

Advanced imaging optics enabled by ultra-thin, all-dielectric metasurfaces (Conference Presentation)

Tian Gu, Mikhail Shalaginov, Sensong An, Fan Yang, Qingyang Du, Yifei Zhang, Clayton Fowler, Clara Rivero-Baleine, Hualiang Zhang, Juejun Hu

Proceedings Volume 11403, 1140303 (2020) https://doi.org/10.1117/12.2559877

KEYWORDS: Imaging systems, Nanostructuring, Polarization, Wavefronts, Control systems

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Proceedings Article | 3 May 2020 Presentation

High-performance reconfigurable meta-optics based on optical phase change materials (Rising Researcher) (Conference Presentation)

Tian Gu, Mikhail Shalaginov, Sensong An, Sawyer Campbell, Yifei Zhang, Carlos Ríos, Lei Kang, Myungkoo Kang, Claudia Gonçalves, Clara Rivero-Baleine, Kathleen Richardson, Douglas Werner, Hualiang Zhang, Juejun Hu

Proceedings Volume 11389, 113890O (2020) https://doi.org/10.1117/12.2557439

KEYWORDS: Imaging systems, Optical properties, Photonic devices, Optical switching, Transparency, Glasses, Switching, Transition metals, Solid state physics

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Proceedings Article | 26 February 2020 Presentation + Paper

2D-material-enabled multifunctional mid-IR optoelectronics

Skylar Deckoff-Jones, Yixiu Wang, Hongtao Lin, Wenzhuo Wu, Juejun Hu

Proceedings Volume 11284, 112841U (2020) https://doi.org/10.1117/12.2543619

KEYWORDS: Mid-IR, Waveguides, Modulators, Sensors, Crystals, Refractive index, Tellurium, Modulation, Photodetectors, Photonic crystals

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Proceedings Article | 26 February 2020 Presentation + Paper

Filling in the missing link: monolithic optical isolators on silicon with high performance, broadband operation, and polarization diversity

Juejun Hu, Yan Zhang, Qingyang Du, Chuangtang Wang, Takian Fakhrul, Yifei Zhang, Shuyuan Liu, Longjiang Deng, Claudia Goncalves, Cesar Blanco, Kathleen Richardson, Duanni Huang, Paolo Pintus, John Bowers, Caroline Ross, Lei Bi

Proceedings Volume 11289, 112891L (2020) https://doi.org/10.1117/12.2553949

KEYWORDS: Optical isolators, Waveguides, Silicon, Magneto-optics, Polarization, Garnet, Oxides, Integrated optics, Molybdenum, Magnetism

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Proceedings Article | 12 September 2019 Presentation + Paper

Designing nonvolatile integrated photonics with low-loss optical phase change materials

Yifei Zhang, Qihang Zhang, Jeffrey Chou, Junying Li, Christopher Roberts, Myungkoo Kang, Claudia Gonçalves, Richard Soref, Carlos Ríos, Mikhail Shalaginov, Kathleen Richardson, Tian Gu, Vladimir Liberman, Juejun Hu

Proceedings Volume 11081, 110811S (2019) https://doi.org/10.1117/12.2528993

KEYWORDS: Integrated photonics, Geometrical optics, Integrated optics, Switching, Switches, Crystals, Photonic crystals, Photonic crystal devices, Attenuators

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Proceedings Article | 9 September 2019 Presentation

High-performance mid-IR metasurface optics (Conference Presentation)

Mikhail Shalaginov, Sensong An, Hanyu Zheng, Li Zhang, Clayton Fowler, Jun Ding, Tian Gu, Hualiang Zhang, Juejun Hu

Proceedings Volume 11080, 1108005 (2019) https://doi.org/10.1117/12.2527527

KEYWORDS: Mid-IR, Free space optics, Thermography, Absorption, Molecules, Molecular spectroscopy, Atmospheric optics, Atmospheric sensing, Spectroscopic atmospheric monitoring techniques, Biomedical optics

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Proceedings Article | 9 September 2019 Presentation

Time domain modeling of bi-anisotropic media and phase change materials with generalized dispersion (Conference Presentation)

Ludmila Prokopeva, Vladimir Liberman, Jeffrey Chou, Christopher Roberts, Mikhail Shalaginov, Yifei Zhang, Juejun Hu, Zhaxylyk Kudyshev, Alexander Kildishev

Proceedings Volume 11080, 1108006 (2019) https://doi.org/10.1117/12.2529097

KEYWORDS: Dispersion, Mathematical modeling, Homogenization, Crystals, Differential equations, Convolution, Metals, Graphene, Photonics, Rapid manufacturing

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Proceedings Article | 2 July 2019 Open Access

A modular laboratory curriculum for teaching integrated photonics to students with diverse backgrounds

Samuel Serna, Nancy Hidalgo, Janice Tjan, Kevin McComber, Lionel Kimerling, Erik Verlage, Julie Diop, Juejun Hu, Sajan Saini, Anu Agarwal, Gerald Gagnon, Stefan Preble, Gregory Howland, Matthew van Niekerk, Jeff Steidle, Karl Mcnulty, Jaime Cardenas, Meiting Song, Miloš Popović, Anatoly Khilo, Pradnya Nagarkar, Farhad Vazehgoo, Ira Moskowitz, Guiru Gu, Cheryl Schnitzer, Edward Deveney, Thomas Kling, Douglas Petkie, Jacob Longacre

Proceedings Volume 11143, 111431C (2019) https://doi.org/10.1117/12.2523867

KEYWORDS: Waveguides, Photonics, Photonic integrated circuits, Integrated photonics, Resonators, Wave propagation, Infrared cameras, Cameras, Engineering education, Silicon

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Proceedings Article | 14 May 2019 Presentation + Paper

Scalable laser-written Ge-As-Pb-Se chalcogenide glass-ceramic films and the realization of infrared gradient refractive index elements

Myungkoo Kang, Teodor Malendevych, Gufan Yin, Ian Murray, Martin Richardson, Juejun Hu, Ilya Mingareev, Kathleen Richardson

Proceedings Volume 10998, 109980E (2019) https://doi.org/10.1117/12.2518771

KEYWORDS: Heat treatments, Refractive index, Crystals, Laser irradiation, Glasses, Laser crystals, GRIN lenses, Nanocrystals, Infrared radiation, Optical components

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Proceedings Article | 14 May 2019 Presentation

High-index-contrast dielectric metasurface optics for MWIR imaging (Conference Presentation)

Mikhail Shalaginov, Sensong An, Lan Li, Hanyu Zheng, Jun Ding, Li Zhang, Clara Rivero-Baleine, Tian Gu, Hualiang Zhang, Juejun Hu

Proceedings Volume 10998, 109980G (2019) https://doi.org/10.1117/12.2516557

KEYWORDS: Mid-IR, Dielectrics, Visible radiation, Near infrared, Optics manufacturing, Night vision, Biosensing, Electromagnetism, Infrared imaging, Infrared radiation

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Proceedings Article | 13 May 2019 Presentation + Paper

Chip-scale high-performance digital Fourier Transform (dFT) spectrometers

Derek Kita, Brando Miranda, Carlos Ríos, David Favela, David Bono, Jérôme Michon, Hongtao Lin, Tian Gu, Juejun Hu

Proceedings Volume 10983, 1098306 (2019) https://doi.org/10.1117/12.2518437

KEYWORDS: Spectrometers, Spectroscopes, Signal to noise ratio, Switches, Spectral resolution, Spectrum analysis, Waveguides, Fourier transforms, Mach-Zehnder interferometers, Chemical elements

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Proceedings Article | 13 May 2019 Paper

Reshaping light: reconfigurable photonics enabled by broadband low-loss optical phase change materials

Yifei Zhang, Jeffrey Chou, Mikhail Shalaginov, Carlos Rios, Christopher Roberts, Paul Robinson, Bridget Bohlin, Qingyang Du, Qihang Zhang, Junying Li, Myungkoo Kang, Claudia Gonçalves, Kathleen Richardson, Tian Gu, Vladimir Liberman, Juejun Hu

Proceedings Volume 10982, 109820Q (2019) https://doi.org/10.1117/12.2513385

KEYWORDS: Switching, Switches, Photonics, Crystals, Mid-IR, Defense and security, Refractive index, Waveguides, Scanning electron microscopy, Optical switching

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Proceedings Article | 4 March 2019 Presentation

On-chip supercontinuum light source integrated broadband photonic sensors (Conference Presentation)

Juejun Hu

Proceedings Volume 10921, 1092106 (2019) https://doi.org/10.1117/12.2505831

KEYWORDS: Sensors, Light sources, Photodetectors, Chalcogenide glass, Spectroscopy, Selenium, Tellurium, Nonlinear optical glasses, Infrared photography, Infrared radiation

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Proceedings Article | 4 March 2019 Presentation + Paper

Laser-induced modification of local refractive index in infrared glass-ceramic films

Ilya Mingareev, Myungkoo Kang, Teodor Malendevych, Gufan Yin, Juejun Hu, Kathleen Richardson, Martin Richardson

Proceedings Volume 10906, 109060X (2019) https://doi.org/10.1117/12.2513462

KEYWORDS: Refractive index, Heat treatments, Laser irradiation, Crystals, Infrared radiation, Glasses, Laser processing, Transmittance, GRIN lenses, Laser crystals

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Proceedings Article | 4 March 2019 Presentation + Paper

Integrated photonics put at full stretch: flexible and stretchable photonic devices enabled by optical and mechanical co-design

Lan Li, Hongtao Lin, Shutao Qiao, Yizhong Huang, Junying Li, Jerome Michon, Carlos Alonso-Ramos, Laurent Vivien, Anupama Yadav, Kathleen Richardson, Nanshu Lu, Tian Gu, Juejun Hu

Proceedings Volume 10922, 109220M (2019) https://doi.org/10.1117/12.2505830

KEYWORDS: Waveguides, Photonic devices, Integrated optics, Sensors, Resonators, Polymers, Photodetectors, Glasses, Integrated photonics, Epoxies

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Proceedings Article | 17 September 2018 Presentation

Ultra-thin, reconfigurable meta-optics using optical phase change materials (Conference Presentation)

Mikhail Shalaginov, Yifei Zhang, Sensong An, Jeffrey Chou, Qingyang Du, Anupama Yadav, Myungkoo Kang, Cesar Blanco, Peter Su, Megan Driggers, Andrew Kirk, Erwan Baleine, Anuradha Agarwal, Clara Rivero-Baleine, Vladimir Liberman, Kathleen Richardson, Hualiang Zhang, Juejun Hu, Tian Gu

Proceedings Volume 10719, 1071911 (2018) https://doi.org/10.1117/12.2323580

KEYWORDS: Crystals, Photonic crystal devices, Photonic crystals, Optical properties, Photonic devices, Optical components, Optical switching, Tellurium, Selenium, Transparency

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Proceedings Article | 23 May 2018 Presentation

Reconfigurable photonics enabled by optical phase change materials (Conference Presentation)

Yifei Zhang, Jeffrey Chou, Qihang Zhang, Junying Li, Huashan Li, Qingyang Du, Anupama Yadav, Myungkoo Kang, Cesar Blanco, Huikai Zhong, Mikhail Shalaginov, Jeffrey Grossman, Richard Soref, Vladimir Liberman, Kathleen Richardson, Juejun Hu, Tian Gu

Proceedings Volume 10686, 1068606 (2018) https://doi.org/10.1117/12.2314894

KEYWORDS: Photonics, Photonic devices, Optical properties, Crystals, Photonic crystal devices, Photonic crystals, Optical switching, Dielectrics, Tellurium, Selenium

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Proceedings Article | 8 May 2018 Presentation + Paper

Advances in infrared GRIN: a review of novel materials towards components and devices

Kathleen Richardson, Myungkoo Kang, Laura Sisken, Anupama Yadav, Cesar Blanco, Michael Antia, Spencer Novak, Charmayne Smith, Andy Buff, Antoine Lepicard, Marc Dussauze, Casey Schwarz, Stephen Kuebler, Chris Grabill, Carlo Pantano, Theresa Mayer, Alexej Pogrebnyakov, Clara Rivero-Baleine, Andrew Kirk, Samantha Mensah, Megan Driggers, Juejun Hu, Pao-Tai Lin, Anuradha Agarwal, Cheng Li, Weiwei Deng

Proceedings Volume 10627, 106270A (2018) https://doi.org/10.1117/12.2304608

KEYWORDS: Glasses, Crystals, Refractive index, GRIN lenses, Infrared radiation, Chalcogenide glass, Ceramics, Heat treatments, Nanocomposites, Ions

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Proceedings Article | 8 May 2018 Presentation + Paper

Thermal conductivity of chalcogenide glasses measured by Raman spectroscopy

Anupama Yadav, Derek Kita, Peter Su, Antoine Lepicard, Anuradha Murthy Agarwal, Juejun Hu, Marc Dussauze, Kathleen Richardson

Proceedings Volume 10627, 106270P (2018) https://doi.org/10.1117/12.2305089

KEYWORDS: Raman spectroscopy, Selenium, Germanium, Glasses, Chalcogenide glass, Thin films, Raman scattering, Silicon, High temperature raman spectroscopy

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Proceedings Article | 14 March 2018 Presentation

Chalcogenide glass-on-2D-materials photonics (Conference Presentation)

Hongtao Lin, Yi Song, Yizhong Huang, Derek Kita, Skylar Deckoff-Jones, Kaiqi Wang, Lan Li, Junying Li, Hanyu Zheng, Zhengqian Luo, Spencer Novak, Anupama Yadav, Chung-Che Huang, Haozhe Wang, Ren-Jye Shiue, Dirk Englund, Tian Gu, Daniel Hewak, Kathleen Richardson, Jing Kong, Juejun Hu

Proceedings Volume 10537, 105370W (2018) https://doi.org/10.1117/12.2287588

KEYWORDS: Mid-IR, Photonics, Chalcogenide glass, Graphene, Silicon, Phosphorus, Silicon photonics, Chalcogenides, Integrated photonics, Singular optics

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Proceedings Article | 14 March 2018 Presentation

Broadband low-loss optical phase change materials and devices (Conference Presentation)

Yifei Zhang, Jeffery Chou, Junying Li, Qingyang Du, Qihang Zhang, Huikai Zhong, Anupama Yadav, Myungkoo Kang, Zhuoran Fang, Hanyu Zheng, Mikhail Shalaginov, Tian Gu, Kathleen Richardson, Vladimir Liberman, Juejun Hu

Proceedings Volume 10541, 105410H (2018) https://doi.org/10.1117/12.2297139

KEYWORDS: Dielectrics, Optical properties, Refractive index, Solid state electronics, Chalcogenides, Optical switching, Optical components, Photonics systems, Switches

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Proceedings Article | 28 April 2017 Open Access

The mid-IR silicon photonics sensor platform (Conference Presentation)

Lionel Kimerling, Juejun Hu, Anuradha Agarwal

Proceedings Volume 10107, 101070J (2017) https://doi.org/10.1117/12.2257723

KEYWORDS: Sensor networks, Pattern recognition, Reflectivity, Manufacturing, Sensors, Mid-IR, Silicon photonics, Waveguides, Internet, Optical sensors

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Advances in integrated silicon photonics are enabling highly connected sensor networks that offer sensitivity, selectivity and pattern recognition. Cost, performance and the evolution path of the so-called ‘Internet of Things’ will gate the proliferation of these networks. The wavelength spectral range of 3-8um, commonly known as the mid-IR, is critical to specificity for sensors that identify materials by detection of local vibrational modes, reflectivity and thermal emission. For ubiquitous sensing applications in this regime, the sensors must move from premium to commodity level manufacturing volumes and cost. Scaling performance/cost is critically dependent on establishing a minimum set of platform attributes for point, wearable, and physical sensing. Optical sensors are ideal for non-invasive applications. Optical sensor device physics involves evanescent or intra-cavity structures for applied to concentration, interrogation and photo-catalysis functions. The ultimate utility of a platform is dependent on sample delivery/presentation modalities; system reset, recalibration and maintenance capabilities; and sensitivity and selectivity performance. The attributes and performance of a unified Glass-on-Silicon platform has shown good prospects for heterogeneous integration on materials and devices using a low cost process flow. Integrated, single mode, silicon photonic platforms offer significant performance and cost advantages, but they require discovery and qualification of new materials and process integration schemes for the mid-IR. Waveguide integrated light sources based on rare earth dopants and Ge-pumped frequency combs have promise. Optical resonators and waveguide spirals can enhance sensitivity. PbTe materials are among the best choices for a standard, waveguide integrated photodetector. Chalcogenide glasses are capable of transmitting mid-IR signals with high transparency. Integrated sensor case studies of i) high sensitivity analyte detection in solution; ii) gas sensing in air and iii) on-chip spectrometry provide good insight into the tradeoffs being made en route to ubiquitous sensor deployment in an Internet of Things.

Proceedings Article | 27 July 2016 Presentation

Subwavelength engineered fiber-to-chip silicon-on-sapphire interconnects for mid-infrared applications (Conference Presentation)

Carlos Alonso-Ramos, Zhaohong Han, Xavier Le Roux, Hongtao Lin, Vivek Singh, Pao Tai Lin, Dawn Tan, Eric Cassan, Delphine Marris-Morini, Laurent Vivien, Kazumi Wada, Juejun Hu, Anuradha Agarwal, Lionel C. Kimerling

Proceedings Volume 9891, 98911J (2016) https://doi.org/10.1117/12.2229350

KEYWORDS: Mid-IR, Silicon, Silicon photonics, Sensors, Absorption spectroscopy, Photonic integrated circuits, Sapphire, Lab on a chip

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The mid-Infrared wavelength range (2-20 µm), so-called fingerprint region, contains the very sharp vibrational and rotational resonances of many chemical and biological substances. Thereby, on-chip absorption-spectrometry-based sensors operating in the mid-Infrared (mid-IR) have the potential to perform high-precision, label-free, real-time detection of multiple target molecules within a single sensor, which makes them an ideal technology for the implementation of lab-on-a-chip devices. Benefiting from the great development realized in the telecom field, silicon photonics is poised to deliver ultra-compact efficient and cost-effective devices fabricated at mass scale. In addition, Si is transparent up to 8 µm wavelength, making it an ideal material for the implementation of high-performance mid-IR photonic circuits. The silicon-on-insulator (SOI) technology, typically used in telecom applications, relies on silicon dioxide as bottom insulator. Unfortunately, silicon dioxide absorbs light beyond 3.6 µm, limiting the usability range of the SOI platform for the mid-IR. Silicon-on-sapphire (SOS) has been proposed as an alternative solution that extends the operability region up to 6 µm (sapphire absorption), while providing a high-index contrast. In this context, surface grating couplers have been proved as an efficient means of injecting and extracting light from mid-IR SOS circuits that obviate the need of cleaving sapphire. However, grating couplers typically have a reduced bandwidth, compared with facet coupling solutions such as inverse or sub-wavelength tapers. This feature limits their feasibility for absorption spectroscopy applications that may require monitoring wide wavelength ranges. Interestingly, sub-wavelength engineering can be used to substantially improve grating coupler bandwidth, as demonstrated in devices operating at telecom wavelengths. Here, we report on the development of fiber-to-chip interconnects to ZrF4 optical fibers and integrated SOS circuits with 500 nm thick Si, operating around 3.8 µm wavelength. Results on facet coupling and sub-wavelength engineered grating coupler solutions in the mid-IR regime will be compared.

SPIE Journal Paper | 17 May 2016 Open Access

Special Section Guest Editorial:2-D Materials for Optics and Photonics

Han Zhang, Edmund Kelleher, Juejun Hu

OE, Vol. 55, Issue 08, 081301, (May 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.8.081301

KEYWORDS: Graphene, Photonics, Fiber lasers, Mode locking, Pulsed laser operation, Bismuth, Physics, Ultrafast phenomena, Dielectrics, Nonlinear optics

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Proceedings Article | 4 March 2016 Paper

Mid-IR high-index dielectric Huygens metasurfaces

Jun Ding, Li Zhang, Han Ren, Mi Zhou, Yuankun Lin, Juejun Hu, Hualiang Zhang

Proceedings Volume 9742, 97421I (2016) https://doi.org/10.1117/12.2212883

KEYWORDS: Mid-IR, Dielectrics, Resonators, Magnetism, Optoelectronic devices, Microwave radiation, Plasmonics, Refractive index, Optical components, Holography, Terahertz radiation, Ions, Phase shifts, Tellurium

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Proceedings Article | 1 March 2016 Paper

Monolithic on-chip nonreciprocal photonics based on magneto-optical thin films

Juejun Hu, Xue Yin Sun, Qingyang Du, Mehmet Onbasli, Caroline Ross

Proceedings Volume 9750, 97500W (2016) https://doi.org/10.1117/12.2209658

KEYWORDS: Photonics, Thin films, Optical isolators, Semiconductors, Silicon, Magnetism, Crystals, Garnet, Waveguides, Resonators

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Proceedings Article | 13 November 2014 Paper

Substrate-blind photonic integration based on high-index glass materials

Hongtao Lin, Lan Li, Yi Zou, Qingyang Du, Okechukwu Ogbuu, Charmayne Smith, Erick Koontz, David Musgraves, Kathleen Richardson, Juejun Hu

Proceedings Volume 9277, 92770T (2014) https://doi.org/10.1117/12.2073972

KEYWORDS: Resonators, Glasses, Waveguides, Graphene, Photonic crystals, Mid-IR, Photonic crystal devices, Bioalcohols, Absorption, Titanium dioxide

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Proceedings Article | 8 March 2014 Paper

Demonstration of high-performance, sub-micron chalcogenide glass photonic devices by thermal nanoimprint

Yi Zou, Loise Moreel, Jie Zhou, Danning Zhang, Hongtao Lin, Lan Li, Qingyang Du, Juejun Hu, Sylvain Danto, Kathleen Richardson, J. David Musgraves, Kevin Dobson, Robert Birkmire

Proceedings Volume 8988, 898806 (2014) https://doi.org/10.1117/12.2040454

KEYWORDS: Resonators, Microrings, Waveguides, Nanoimprint lithography, Photonic devices, Glasses, Chalcogenide glass, Polymers, Silicon, Lithography

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Proceedings Article | 8 March 2014 Paper

Chip-to-chip optical interconnects based on flexible integrated photonics

Lan Li, Yi Zou, Hongtao Lin, Juejun Hu, Xiaochen Sun, Ning-Ning Feng, Sylvain Danto, Kathleen Richardson, Tian Gu, Michael Haney

Proceedings Volume 8991, 89910T (2014) https://doi.org/10.1117/12.2037812

KEYWORDS: Waveguides, Optical interconnects, Photonics, Glasses, Packaging, Adhesives, Optical alignment, Laser bonding, Vertical cavity surface emitting lasers, Resonators

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Proceedings Article | 8 March 2014 Paper

ZrO2-TiO2 thin films and resonators for mid-infrared integrated photonics

Feipeng Jiang, Ningyuan Duan, Hongtao Lin, Lan Li, Juejun Hu, Lei Bi, Haipeng Lu, Xiaolong Weng, Jianliang Xie, Longjiang Deng

Proceedings Volume 8988, 89880S (2014) https://doi.org/10.1117/12.2038415

KEYWORDS: Thin films, Waveguides, Zirconium dioxide, Resonators, Absorption, Oxygen, Mid-IR, Integrated photonics, Sputter deposition, Crystals

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Proceedings Article | 7 March 2014 Paper

Planar chalcogenide glass mid-infrared photonics

Hongtao Lin, Lan Li, Yi Zou, Fei Deng, Chaoying Ni, Sylvain Danto, J. David Musgraves, Kathleen Richardson, Stephen Kozacik, Maciej Murakowski, Dennis Prather, Juejun Hu

Proceedings Volume 8974, 89740D (2014) https://doi.org/10.1117/12.2035688

KEYWORDS: Mid-IR, Waveguides, Chalcogenide glass, Resonators, Transparency, Photonics, Photonic crystals, Mirrors, Integrated optics, Silicon

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Proceedings Article | 15 October 2013 Paper

Nanoscale optical features via hot-stamping of As2Se3 glass

Sylvain Danto, Erick Koontz, Yi Zou, Tony Ogbuu, Benn Gleason, Peter Wachtel, Jonathan Musgraves, Juejun Hu, Kathleen Richardson

Proceedings Volume 8884, 88841T (2013) https://doi.org/10.1117/12.2029274

KEYWORDS: Glasses, Thin films, Semiconducting wafers, Nanoimprint lithography, Silicon, Scanning electron microscopy, Dewetting, Crystals, Photomicroscopy, Wafer-level optics

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Proceedings Article | 12 March 2013 Paper

Chalcogenide glass planar photonics: from mid-IR sensing to 3-D flexible substrate integration

Hongtao Lin, Lan Li, Yi Zou, Okechukwu Ogbuu, Sylvain Danto, J. David Musgraves, Kathleen Richardson, Juejun Hu

Proceedings Volume 8600, 86000K (2013) https://doi.org/10.1117/12.2000683

KEYWORDS: Mid-IR, Resonators, Chalcogenide glass, Waveguides, Photonics, Glasses, Transparency, Silicon, Polymers, Photonic devices

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Proceedings Article | 20 November 2012 Paper

Chalcogenide glass based integrated photonics

Lan Li, Hongtao Lin, Yi Zou, Okechukwu Ogbuu, Sylvain Danto, J. David Musgraves, Kathleen Richardson, Juejun Hu

Proceedings Volume 8564, 85640T (2012) https://doi.org/10.1117/12.2000678

KEYWORDS: Waveguides, Mid-IR, Resonators, Chalcogenide glass, Glasses, Silicon, Transparency, Photonics, Polymers, Integrated photonics

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Proceedings Article | 3 June 2011 Paper

Photothermal nano-cavities for ultra-sensitive chem-bio detection

Juejun Hu, J. David Musgrave, Nathan Carlie, Anu Agarwal, Kathleen Richardson, Lionel Kimerling

Proceedings Volume 8018, 80180W (2011) https://doi.org/10.1117/12.883123

KEYWORDS: Chalcogenide glass, Thermography, Absorption, Spectroscopy, Sensors, Infrared radiation, Resonators, Silicon, Infrared spectroscopy, Thermal optics

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Proceedings Article | 17 May 2011 Paper

Resonant cavity enhancement of polycrystalline PbTe films for IR detectors on Si-ROICs

Jianfei Wang, Timothy Zens, Juejun Hu, Piotr Becla, Anuradha Agarwal, Lionel Kimerling

Proceedings Volume 8034, 80340K (2011) https://doi.org/10.1117/12.884081

KEYWORDS: Photodetectors, Sensors, Quantum efficiency, Mid-IR, Mirrors, Silicon, Reflectivity, Readout integrated circuits, Absorption, Staring arrays

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Proceedings Article | 24 January 2011 Paper

Development of chipscale chalcogenide glass based infrared chemical sensors

Juejun Hu, J. David Musgraves, Nathan Carlie, Bogdan Zdyrko, Igor Luzinov, Anu Agarwal, Kathleen Richardson, Lionel Kimerling

Proceedings Volume 7945, 79452C (2011) https://doi.org/10.1117/12.871399

KEYWORDS: Absorption, Sensors, Waveguides, Chalcogenide glass, Infrared radiation, Resonators, Microfluidics, Carbon, Infrared sensors, Chemical fiber sensors

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Proceedings Article | 17 January 2011 Paper

Monolithic integration of chalcogenide glass/iron garnet waveguides and resonators for on-chip nonreciprocal photonic devices

Lei Bi, Juejun Hu, Gerald Dionne, Lionel Kimerling, C. Ross

Proceedings Volume 7941, 794105 (2011) https://doi.org/10.1117/12.875184

KEYWORDS: Waveguides, Garnet, Resonators, Photonic devices, Silicon, Silicon films, Bismuth, Transmittance, Optical isolators, Crystals

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Proceedings Article | 12 February 2010 Paper

Fabrication and characterization of As2S3/Y3Fe5O12 and Y3Fe5O12/SOI strip-loaded waveguides for integrated optical isolator applications

Lei Bi, Juejun Hu, Lionel Kimerling, C. Ross

Proceedings Volume 7604, 760406 (2010) https://doi.org/10.1117/12.841832

KEYWORDS: Waveguides, Silicon, Crystals, Optical isolators, Resonators, Magnetism, Oxides, Integrated optics, Silicon films, Wave propagation

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Proceedings Article | 25 February 2009 Paper

Integrating optics and micro-fluidic channels using femtosecond laser irradiation

T. Anderson, J. Hu, M. Ramme, J. Choi, C. Faris, N. Carlie, A. Agarwal, L. Petit, L. Kimerling, K. Richardson, M. Richardson

Proceedings Volume 7203, 72030I (2009) https://doi.org/10.1117/12.815306

KEYWORDS: Glasses, Femtosecond phenomena, Refractive index, Chalcogenide glass, Microfluidics, Waveguides, Sensors, Integrated optics, Channel projecting optics, Wet etching

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Proceedings Article | 10 February 2009 Paper

As2S3/Sr(Ti0.7Co0.3)O3 and As2S3/Sr(Ti0.6Fe0.4)O3 strip-loaded waveguides for integrated magneto-optical isolator applications

Lei Bi, Hyun-Suk Kim, Juejun Hu, Lionel Kimerling, C. Ross

Proceedings Volume 7218, 721803 (2009) https://doi.org/10.1117/12.809392

KEYWORDS: Waveguides, Absorption, Optical isolators, Silicon, Refractive index, Magnetism, Molybdenum, Ellipsometry, Transmittance, Ferromagnetics

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Proceedings Article | 12 February 2008 Paper

Design, fabrication, and integration of HIC glass waveguides on a silicon platform

Juejun Hu, Nathan Carlie, Ning-Ning Feng, Laeticia Petit, Anu Agarwal, Kathleen Richardson, Lionel Kimerling

Proceedings Volume 6896, 68960Z (2008) https://doi.org/10.1117/12.763588

KEYWORDS: Waveguides, GRIN lenses, Cladding, Glasses, Optical lithography, Silicon, Scattering, Semiconducting wafers, Photoresist materials, Fabrication

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Proceedings Article | 14 February 2007 Paper

Low-loss integrated planar chalcogenide waveguides for chemical sensing

Juejun Hu, Vladimir Tarasov, Nathan Carlie, Rong Sun, Laeticia Petit, Anu Agarwal, Kathleen Richardson, Lionel Kimerling

Proceedings Volume 6444, 64440N (2007) https://doi.org/10.1117/12.696996

KEYWORDS: Waveguides, Absorption, Sensors, Microfluidics, Chalcogenides, Antimony, Germanium, Carbon, Biological and chemical sensing, Chalcogenide glass

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