Prof. Ekmel Özbay Profile

Prof. Ekmel Özbay

Director at Bilkent Univ

SPIE Involvement:

Conference Program Committee | Author | Editor

Publications (63)

Proceedings Article | 17 March 2023 Presentation

Scalable and efficient photonic designs using disordered metamaterial nanounits

Ekmel Özbay

Proceedings Volume PC12430, PC124301A (2023) https://doi.org/10.1117/12.2650148

KEYWORDS: Metamaterials, Absorption, Photocatalytic water splitting, Optical filters, Nanostructures, Nanorods, Nanoantennas, Metals, Bismuth, Ultraviolet radiation

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Proceedings Article | 17 March 2023 Presentation

Centimeter scale nanostructures: lithography-free metamaterials for photoconversion, photodetection, light emission, sensing, and filtering

Ekmel Ozbay

Proceedings Volume PC12431, PC124310H (2023) https://doi.org/10.1117/12.2661181

KEYWORDS: Nanostructures, Photodetectors, Metamaterials, Ultraviolet radiation, Photonics, Absorption, Thermal sensing, Optical filters, Nanophotonics, Nanolithography

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Proceedings Article | 30 May 2022 Poster

Switchable dual mode terahertz beamsplitter and perfect absorber

Veysel Erçağlar, Hodjat Hajian, Andriy Serebryannikov, Ekmel Özbay

Proceedings Volume PC12130, PC121301T (2022) https://doi.org/10.1117/12.2626623

KEYWORDS: Beam splitters, Terahertz radiation, Visible radiation, Resonators, Reflectivity, Graphene, Dielectric polarization, Vanadium, Spiral phase plates, Prisms

Proceedings Article | 10 March 2020 Presentation

Strong light-matter interaction in lithography-free metamaterial perfect absorbers: energy conversion, color filtering, and sensing applications (Conference Presentation)

Ekmel Özbay, Amir Ghobadi, Hodjat Hajian, Bayram Butun

Proceedings Volume 11289, 1128904 (2020) https://doi.org/10.1117/12.2554961

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Proceedings Article | 9 September 2019 Presentation + Paper

Low dark current diffusion limited planar type InGaAs photodetectors

M. Halit Dolas, Okan Atesal, M. Deniz Caliskan, Alpan Bek, Ekmel Ozbay

Proceedings Volume 11129, 111290D (2019) https://doi.org/10.1117/12.2528666

KEYWORDS: Diffusion, Indium gallium arsenide, Sensors, Photodetectors, Data modeling, Short wave infrared radiation, Zinc

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Proceedings Article | 5 September 2019 Presentation + Paper

Disordered and densely packed ITO nanorods as an excellent lithography-free optical solar reflector metasurface for the radiative cooling of spacecraft

Deniz Umut Yildirim, Amir Ghobadi, Mahmut Can Soydan, Okan Atesal, Ahmet Toprak, Mehmet Deniz Caliskan, Ekmel Ozbay

Proceedings Volume 11080, 110801Q (2019) https://doi.org/10.1117/12.2529003

KEYWORDS: Absorption, Space operations, Nanorods, Silica, Reflectors, Dielectrics, Plasmonics, Thermography, Infrared radiation, Sputter deposition, Metamaterials, Electromagnetic radiation, Radiative energy transfer

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Proceedings Article | 8 March 2019 Presentation

Strong light-matter interaction in lithography-free planar metamaterial perfect absorbers (Conference Presentation)

Ekmel Özbay, Amir Ghobadi, Hodjat Hajian, Bayram Butun

Proceedings Volume 10926, 109261R (2019) https://doi.org/10.1117/12.2508195

KEYWORDS: Metamaterials, Absorption, Nanostructures, Photovoltaics, Ultraviolet radiation, Electromagnetism, Thermal sensing, Photodetectors, Nanofabrication, Light-matter interactions

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Proceedings Article | 1 March 2019 Presentation + Paper

Normally-off p-GaN gate InAlN/GaN HEMTs grown on silicon substrates

Melisa Ekin Gulseren, Berkay Bozok, Gokhan Kurt, Omer Ahmet Kayal, Mustafa Ozturk, Sertac Ural, Bayram Butun, Ekmel Ozbay

Proceedings Volume 10918, 109181A (2019) https://doi.org/10.1117/12.2507398

KEYWORDS: Field effect transistors, Gallium nitride, Silicon, Aluminum, Etching, Transistors, Measurement devices, Heterojunctions, Doping, Epitaxy

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Proceedings Article | 17 September 2018 Presentation

Metamaterial based nanobiosensors, nanophotodetectors, and perfect absorbers (Conference Presentation)

Ekmel Özbay

Proceedings Volume 10719, 107190D (2018) https://doi.org/10.1117/12.2323751

KEYWORDS: Metamaterials, Plasmonics, Resonance enhancement, Metals, Photodetectors, Lithography, Biosensing, Bacteria, Surface enhanced Raman spectroscopy, Raman scattering

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Proceedings Article | 23 May 2018 Presentation

Metamaterial-based nanobiosensors, nanophotodetectors and perfect absorbers (Conference Presentation)

Ekmel Özbay

Proceedings Volume 10671, 106711Q (2018) https://doi.org/10.1117/12.2305871

KEYWORDS: Metamaterials, Plasmonics, Resonance enhancement, Metals, Photodetectors, Lithography, Biosensing, Bacteria, Surface enhanced Raman spectroscopy, Raman scattering

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Proceedings Article | 14 May 2018 Presentation + Paper

Field test and fading measurement of a distributed acoustic sensor system over a 50 km-long fiber

Faruk Uyar, Tolga Kartaloglu, Ibrahim Ozdur, Ekmel Ozbay

Proceedings Volume 10654, 106540D (2018) https://doi.org/10.1117/12.2304735

KEYWORDS: Signal to noise ratio, Data acquisition, Acoustics, Sensors, Sensing systems, Polarization, Signal detection, Distributed computing, Fiber lasers, Laser stabilization

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Proceedings Article | 14 March 2018 Presentation

Metal-insulator-metal multilayer-based ultra-broadband perfect absorbers: from non-uniform texturing to nano-hole plasmonic units (Conference Presentation)

Amir Ghobadi, Bayram Bütün, Ekmel Özbay

Proceedings Volume 10528, 105281F (2018) https://doi.org/10.1117/12.2291469

KEYWORDS: Plasmonics, Absorption, Metals, Lithography, Atomic layer deposition, Photonics, Light wave propagation, Black bodies, Metamaterials, Lithium

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Light manipulation in sub wavelength geometries is an attribute that nano photonics offers. Propagation and guiding, beaming, and confinement of the light are the most studied concepts in this area. Design of an ideal “black body” absorber with absorption of unity is one of the ultimate goals in the field of sub wavelength light confinement. Up to now, several methods and architectures are exploited to obtain high performance black absorber. One of the most commonly used approaches is to utilize metal-insulator (MI) multilayer stack. It was theoretically demonstrated that the use of periodic MI pairs can provide impedance matching in a broad frequency range [1]. Later, It was theoretically and experimentally proved that Cr-SiO2 multilayer can provide highest light absorption over 90% in a broad wavelength range between 400 nm-1400 nm [2]. In this paper, we demonstrate a facile, lithography free, and large scale compatible fabrication route to fabricate ultra-broadband wide angle perfect absorber based on metal-insulator-metal-insulator (MIMI) stack design. 600 nm bandwidth (400 nm – 1000 nm) is attained utilizing this planar design. This design is later improved by intro-duction of non-uniform texturing [3] and employing disordered nano hole plasmonic patterns where the overall process is large scale compatible and lithography free. Our findings show that the optimized design can retain light absorption above 0.9 over a wide range wavelength of 400 nm – 1490 nm, as shown in Fig. 1. To the best of our knowledge, this bandwidth is the highest among other reported studies that employ this multilayer architec-ture. Fig. 1: The measured absorption spectra for a) planar, b) non-uniform texturing, and c) nanohole plasmonic cases. REFERENCES 1. Mattiucci, N.; Bloemer, M. J.; Aközbek, N.; D’Aguanno, G. Impedance Matched Thin Metamaterials Make Metals Absorbing. Sci. Rep. 2013, 3, 3203. 2. Deng, H.; Li, Z.; Stan, L.; Rosenmann, D.; Czaplewski, D. Broadband Perfect Absorber Based on One Ultrathin Layer of Refractory Metal. Opt. Lett. 2015, 40 (11), 2592–2595. 3. Ghobadi A.; Dereshgi, S, A.; Hajian, H.; Bozok, B.; Butun, B.; and Ozbay, E. Ultra-broadband, wide angle absorber utilizing metal insulator multilayers stack with a multi-thickness metal surface texture. Sci. Rep. 2017, 7, 4755.

Proceedings Article | 8 June 2017 Presentation

Controlling coherence in epsilon-near-zero metamaterials (Conference Presentation)

Humeyra Caglayan, Hodjat Hajian, Ekmel Ozbay

Proceedings Volume 10227, 102270I (2017) https://doi.org/10.1117/12.2264372

KEYWORDS: Metamaterials, Refractive index, Waveguides, Electromagnetism, Microwave radiation, Phase velocity, Dispersion, Polarization, Integrated photonics, Optical components

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Recently, metamaterials with near-zero refractive index have attracted much attention. Light inside these materials experiences no spatial phase change and extremely large phase velocity, makes these peculiar systems applicable for realizing directional emission, tunneling waveguides, large-area single-mode devices and electromagnetic cloaks. In addition, epsilon-near-zero (ENZ) metamaterials can also enhance light transmission through a subwavelength aperture. Impedance-matched all-dielectric zero-index metamaterials which exhibit Dirac cone dispersions at center of the Brillouin zone, have been experimentally demonstrated at microwave regime and optical frequencies for transverse-magnetic (TM) polarization of light. More recently, it has been also proved that these systems can be realized in a miniaturized in-plane geometry useful for integrated photonic applications, i.e. these metamaterials can be integrated with other optical elements, including waveguides, resonators and interferometers. In this work, using a zero-index metamaterial at the inner and outer sides of a subwavelength aperture, we numerically and experimental study light transmission through and its extraction from the aperture. The metamaterial consists of a combination of two double-layer arrays of scatterers with dissimilar subwavelength dimensions. The metamaterial exhibits zero-index optical response in microwave region. Our numerical investigation shows that the presence of the metamaterial at the inner side of the aperture leads to a considerable increase in the transmission of light through the subwavelength aperture. This enhancement is related to the amplification of the amplitude of the electromagnetic field inside the metamaterial which drastically increases the coupling between free space and the slit. By obtaining the electric field profile of the light passing through the considered NZI/aperture/NZI system at this frequency we found out that in addition to the enhanced transmission there is an excellent beaming of the extracted light from the structure. We have theoretically and experimentally shown that using a zero-index metamaterial at the inner and outer sides of a metallic subwavelength slit can considerably enhance the transmission of light through the aperture and beam its extraction, respectively. This work has been supported by TUBITAK under Project No 114E505. The author H.C. also acknowledges partial support from the Turkish Academy of Sciences.

Proceedings Article | 5 May 2017 Paper

Plasmonic enhanced terahertz time-domain spectroscopy system for identification of common explosives

Yiğit Demirağ, Bayram Bütün, Ekmel Özbay

Proceedings Volume 10210, 1021012 (2017) https://doi.org/10.1117/12.2264953

KEYWORDS: Principal component analysis, Explosives, Antennas, Terahertz radiation, Plasmonics, Terahertz spectroscopy, Spectroscopy, Surface plasmons, Absorption, Humidity, Data modeling, Expectation maximization algorithms

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Proceedings Article | 27 April 2017 Paper

Modeling of thermal sensitivity of a fiber optic gyroscope coil with practical quadrupole winding

Serdar Ogut, Berk Osunluk, Ekmel Ozbay

Proceedings Volume 10208, 1020806 (2017) https://doi.org/10.1117/12.2258030

KEYWORDS: Fiber optic gyroscopes, Finite element methods, Fiber optics sensors, Sensors, Error analysis, Environmental sensing, Thermal modeling, Homogenization, Temperature metrology, Fiber optics, Structured optical fibers, Phase shifts, Adhesives, Cladding, Electro optical modeling, Coating

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Proceedings Article | 21 May 2014 Paper

Comparison of terahertz technologies for detection and identification of explosives

René Beigang, Sandra Biedron, Slawomir Dyjak, Frank Ellrich, Magnus Haakestad, Daniel Hübsch, Tolga Kartaloglu, Ekmel Ozbay, Frank Ospald, Norbert Palka, Uroš Puc, Elżbieta Czerwińska, Asaf Sahin, Aleksander Sešek, Janez Trontelj, Andrej Švigelj, Hakan Altan, Arthur van Rheenen, Michał Walczakowski

Proceedings Volume 9102, 91020C (2014) https://doi.org/10.1117/12.2050367

KEYWORDS: Terahertz radiation, Absorption, Explosives, Spectroscopy, Electronics, Spectroscopes, Crystals, Sensors, Antennas, Absorbance

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SPIE Journal Paper | 21 March 2014 Open Access

Special Section Guest Editorial: Terahertz Physics and Applications

Mehdi Anwar, Joseph Melinger, Ekmel Ozbay, Masayoshi Tonouchi

OE, Vol. 53, Issue 03, 031201, (March 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.3.031201

KEYWORDS: Terahertz radiation, Physics, Terahertz spectroscopy, Electronics, Spectroscopy, Nondestructive evaluation, Antennas, Electromagnetism, Crystals, Analytical research

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Proceedings Article | 11 September 2013 Paper

Plasmonic nanoparticle based nanobiosensors and nanophotodetectors

Neval Cinel, Serkan Bütün, Ekmel Özbay

Proceedings Volume 8808, 88080R (2013) https://doi.org/10.1117/12.2022335

KEYWORDS: Photodetectors, Sensors, Plasmonics, Aluminum, Ultraviolet radiation, Nanoparticles, Gallium nitride, Biosensing, Refractive index, Bacteria

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Proceedings Article | 15 March 2013 Paper

Broadband quarter-wave plates at near-infrared using high-contrast gratings

Mehmet Mutlu, Ahmet Akosman, Gokhan Kurt, Mutlu Gokkavas, Ekmel Ozbay

Proceedings Volume 8633, 86330O (2013) https://doi.org/10.1117/12.2009347

KEYWORDS: Finite-difference time-domain method, Silicon, Polarization, Waveguides, Refractive index, Magnetism, Dispersion, Wave propagation, Sapphire, Linear polarizers

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Proceedings Article | 21 February 2013 Paper

Plasmonic nanoparticle based nanobiosensors and nanophotodetectors

Neval Cinel, Serkan Bütün, Ekmel Özbay

Proceedings Volume 8632, 86321P (2013) https://doi.org/10.1117/12.2012439

KEYWORDS: Photodetectors, Sensors, Plasmonics, Aluminum, Ultraviolet radiation, Nanoparticles, Gallium nitride, Bacteria, Biosensing, Refractive index

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SPIE Journal Paper | 5 October 2012

Simultaneously opening transmission channels with negative and positive phase velocities for the stacked subwavelength apertures in fishnet metamaterials with hybrid unit lattices

Atilla Cakmak, Evrim Colak, Ekmel Özbay

JNP, Vol. 6, Issue 01, 061608, (October 2012) https://doi.org/10.1117/12.10.1117/1.JNP.6.061608

KEYWORDS: Dielectrics, Resonators, Aluminum, Magnetism, Metamaterials, Metals, Wave propagation, Silicon carbide, Microwave radiation, Phase velocity

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SPIE Journal Paper | 25 September 2012 Open Access

Special Section Guest Editorial: Selected Papers from the 4th Mediterranean Conference on Nanophotonics

Zeev Zalevsky, Ekmel Özbay, Ibrahim Abdulhalim

JNP, Vol. 6, Issue 01, 061699, (September 2012) https://doi.org/10.1117/12.10.1117/1.JNP.6.061699

KEYWORDS: Nanophotonics, Photonic crystals, Nanotechnology, Electro optics, Metamaterials, Plasmonics, Photonic crystal devices, Photonic devices, Logic devices, Plasmonic couplers

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SPIE Journal Paper | 31 July 2012

Nanofabrication and plasma polymerization assisted surface modification of a transducer based on localized surface plasmon resonance of gold nanostructure arrays for biosensor applications

Adil Burak Turhan, Ekmel Özbay, Demet Ataman, Yasin Sen, Mehmet Mutlu

JNP, Vol. 6, Issue 01, 061602, (July 2012) https://doi.org/10.1117/12.10.1117/1.JNP.6.061602

KEYWORDS: Plasma, Nanostructures, Gold, Polymerization, Electronic design automation, Transducers, Sensors, Nanofabrication, Neodymium, Surface plasmons

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SPIE Journal Paper | 26 July 2012

Absorption enhancement in InGaN-based photonic crystal-implemented solar cells

Tamara Gundogdu, Mutlu Gökkavas, Ekmel Özbay

JNP, Vol. 6, Issue 01, 061603, (July 2012) https://doi.org/10.1117/12.10.1117/1.JNP.6.061603

KEYWORDS: Absorption, Solar cells, Indium gallium nitride, Photonic crystals, Polarization, Etching, Solar energy, Nanophotonics, Crystals, Indium

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Proceedings Article | 1 May 2012 Open Access

Science meets magic: photonic metamaterials

Ekmel Ozbay

Proceedings Volume 8423, 842302 (2012) https://doi.org/10.1117/12.924808

KEYWORDS: Metamaterials, Terahertz radiation, Dielectric polarization, Magnetism, Chiral metamaterials, Refractive index, Dielectrics, Photonic metamaterials, Electromagnetism, Radio propagation

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Proceedings Article | 22 February 2012 Paper

Science meets magic: photonic metamaterials

Ekmel Ozbay

Proceedings Volume 8269, 82690L (2012) https://doi.org/10.1117/12.916557

KEYWORDS: Metamaterials, Terahertz radiation, Dielectric polarization, Magnetism, Chiral metamaterials, Refractive index, Dielectrics, Photonic metamaterials, Electromagnetism, Radio propagation

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Proceedings Article | 12 February 2011 Paper

SILVER nano-cylinders designed by EBL used as label free LSPR nano-biosensors

Neval Cinel, Serkan Bütün, Ekmel Özbay

Proceedings Volume 7911, 79111I (2011) https://doi.org/10.1117/12.879139

KEYWORDS: Electron beam lithography, Silver, Sensors, Biosensors, Reflection, Nanoparticles, Bacteria, Coating, Surface plasmons, Biosensing

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SPIE Journal Paper | 1 January 2011

Enhanced transmission of electromagnetic waves through split-ring resonator-shaped apertures

Levent Sahin, Koray Aydin, Gonul Sayan, Ekmel Ozbay

JNP, Vol. 5, Issue 01, 051812, (January 2011) https://doi.org/10.1117/12.10.1117/1.3599873

KEYWORDS: Electromagnetic radiation, Metals, Microwave radiation, Antennas, Waveguides, Surface plasmons, Wave propagation, Transmitters, Electromagnetism, Near field scanning optical microscopy

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SPIE Journal Paper | 1 January 2011 Open Access

Special Section Guest Editorial: Selected Papers from the 3rd Mediterranean Conference on Nanophotonics

Zeev Zalevsky, Ekmel Ozbay, Ibrahim Abdulhalim

JNP, Vol. 5, Issue 01, 051899, (January 2011) https://doi.org/10.1117/12.10.1117/1.3599054

KEYWORDS: Nanophotonics, Nanotechnology, Electro optics, Research facilities, Metamaterials, Fabrication, Lanthanum

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Proceedings Article | 30 August 2010 Paper

Photonic metamaterial absorber designs for infrared solar cell applications

Kamil Boratay Alici, Ekmel Ozbay

Proceedings Volume 7772, 77721B (2010) https://doi.org/10.1117/12.860223

KEYWORDS: Metamaterials, Photonic metamaterials, Magnetism, Infrared radiation, Absorption, Metals, Terahertz radiation, Split ring resonators, Solar cells, Absorbance

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SPIE Journal Paper | 1 July 2010

Observation of cavity structures in composite metamaterials

Humeyra Caglayan, Ekmel Özbay

JNP, Vol. 4, Issue 01, 041790, (July 2010) https://doi.org/10.1117/12.10.1117/1.3475763

KEYWORDS: Metamaterials, Wave propagation, Composites, Radio propagation, Free space, Electromagnetism, Electromagnetic radiation, Magnetism, Refraction, Microwave radiation

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SPIE Journal Paper | 1 July 2010 Open Access

Guest Editorial: Selected Papers from the 2nd Mediterranean Conference on Nanophotonics

Zeev Zalevsky, Ekmel Ozbay, Ibrahim Abdulhalim

JNP, Vol. 4, Issue 01, 041799, (July 2010) https://doi.org/10.1117/12.10.1117/1.3475730

KEYWORDS: Nanophotonics, Physics, Electronics engineering, Nanotechnology, Electro optics, Research facilities, Waveguides, Current controlled current source

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Proceedings Article | 29 April 2010 Paper

Metamaterial-based cloaking with sparse distribution of spiral resonators

K. Guven, E. Saenz, R. Gonzalo, E. Ozbay, S. Tretyakov

Proceedings Volume 7711, 771111 (2010) https://doi.org/10.1117/12.855099

KEYWORDS: Waveguides, Particles, Metals, Electromagnetism, Metamaterials, Wave propagation, Radio propagation, Electromagnetic radiation, Scattering, Magnetism

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SPIE Journal Paper | 1 November 2009 Open Access

Guest Editorial: Mediterranean Nanophotonics

Zeev Zalevsky, Ekmel Ozbay, Ibrahim Abdulhalim

JNP, Vol. 3, Issue 01, 031799, (November 2009) https://doi.org/10.1117/12.10.1117/1.3271457

KEYWORDS: Nanophotonics, Fabrication, Nanotechnology, Electro optics, Nanolithography, Research facilities, Sensors, Modulation, Current controlled current source

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Proceedings Article | 27 May 2009 Paper

The magical world of metamaterials

Humeyra Caglayan, Ekmel Ozbay

Proceedings Volume 7366, 73660X (2009) https://doi.org/10.1117/12.821407

KEYWORDS: Metamaterials, Refractive index, Refraction, Reflection, Magnetism, Negative refraction, Microwave radiation, Electromagnetism, Phase velocity, Dielectrics

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Proceedings Article | 6 May 2008 Paper

Negative refraction and subwavelength focusing using left-handed composite metamaterials

Ekmel Ozbay, Koray Aydin

Proceedings Volume 6987, 698703 (2008) https://doi.org/10.1117/12.785560

KEYWORDS: Metamaterials, Refractive index, Refraction, Negative refraction, Reflection, Magnetism, Composites, Prisms, Dielectrics, Split ring resonators

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Proceedings Article | 28 January 2008 Paper

Negative refraction and subwavelength focusing using left-handed composite metamaterials

Ekmel Ozbay, Koray Aydin

Proceedings Volume 6901, 690104 (2008) https://doi.org/10.1117/12.777405

KEYWORDS: Metamaterials, Refractive index, Refraction, Negative refraction, Reflection, Magnetism, Composites, Prisms, Microwave radiation, Dielectrics

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SPIE Journal Paper | 1 October 2007

Experimental study of subwavelength focusing by left-handed metamaterials with a negative refractive index

Ekmel Özbay, Koray Aydin

JNP, Vol. 1, Issue 01, 011695, (October 2007) https://doi.org/10.1117/12.10.1117/1.2805841

KEYWORDS: Metamaterials, Refractive index, Refraction, Interfaces, Negative refraction, Lenses, Near field optics, Magnetism, Superlenses, Prisms

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Proceedings Article | 23 May 2007 Paper

Experimental demonstration of sub-wavelength imaging by left handed metamaterials

Ekmel Ozbay

Proceedings Volume 6593, 659312 (2007) https://doi.org/10.1117/12.723936

KEYWORDS: Metamaterials, Negative refraction, Photonic crystals, Electromagnetism, Refraction, Solids, Antennas, Magnetism, Composites, Split ring resonators

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SPIE Journal Paper | 1 January 2007 Open Access

Guest Editorial: Selected Papers from the First Joint Israeli-Turkish Workshop on Nanophotonics

Zeev Zalevsky, Ekmel Ozbay, Ibrahim Abdulhalim

JNP, Vol. 1, Issue 01, 011699, (January 2007) https://doi.org/10.1117/12.10.1117/1.2805217

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Proceedings Article | 1 March 2006 Paper

Labyrinth-based left-handed metamaterials and subwavelength focusing of electromagnetic waves

Ekmel Ozbay, Irfan Bulu, Humeyra Caglayan

Proceedings Volume 6128, 612813 (2006) https://doi.org/10.1117/12.649548

KEYWORDS: Metamaterials, Magnetism, Antennas, Electromagnetic radiation, Refraction, Receivers, Free space, Split ring resonators, Negative refraction, Plasma

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Proceedings Article | 11 November 2005 Paper

Development of left-handed composite materials and negative refracting photonic crystals with subwavelength focusing

Ekmel Ozbay

Proceedings Volume 6005, 60050A (2005) https://doi.org/10.1117/12.630087

KEYWORDS: Photonic crystals, Negative refraction, Electromagnetism, Refraction, Composites, Solids, Metamaterials, Dielectrics, Antennas, Magnetism

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Proceedings Article | 25 October 2005 Paper

Design, fabrication, and characterization of high-performance solar-blind AlGaN photodetectors

Ekmel Ozbay

Proceedings Volume 6013, 601307 (2005) https://doi.org/10.1117/12.630086

KEYWORDS: Sensors, Photodiodes, Aluminum, Gallium, Gallium nitride, Photodetectors, Picosecond phenomena, Etching, Ultraviolet radiation, Quantum efficiency

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Proceedings Article | 12 October 2005 Paper

Negative refraction and subwavelength focusing using photonic crystals

Ekmel Ozbay

Proceedings Volume 5950, 59500J (2005) https://doi.org/10.1117/12.620663

KEYWORDS: Negative refraction, Photonic crystals, Interfaces, Refraction, Dielectrics, Refractive index, Crystals, Finite-difference time-domain method, Wave propagation, Antennas

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Proceedings Article | 28 September 2005 Paper

EU NoE-METAMORPHOSE: metamaterials research activities

Ekmel Ozbay

Proceedings Volume 5955, 59550D (2005) https://doi.org/10.1117/12.621313

KEYWORDS: Metamaterials, Electromagnetism, Microwave radiation, Chemical elements, Modeling, Nanotechnology, Radio optics, Imaging systems, Networks

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Proceedings Article | 28 September 2005 Paper

Observation of negative refraction and negative phase velocity in true left-handed metamaterials

Ekmel Ozbay

Proceedings Volume 5955, 595502 (2005) https://doi.org/10.1117/12.620264

KEYWORDS: Phase velocity, Negative refraction, Magnetism, Refractive index, Refraction, Metamaterials, Plasma, Phase shifts, Solids, Phase measurement

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Proceedings Article | 7 July 2005 Paper

Observation of negative refraction and negative phase velocity in true left-handed metamaterials

Ekmel Ozbay, K. Aydin, K. Guven, I. Bulu

Proceedings Volume 5840, (2005) https://doi.org/10.1117/12.608006

KEYWORDS: Phase velocity, Negative refraction, Magnetism, Refractive index, Refraction, Metamaterials, Plasma, Phase shifts, Solids, Phase measurement

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Proceedings Article | 13 April 2005 Paper

Negative refraction and subwavelength focusing using photonic crystals

Ekmel Ozbay, Koray Aydin, K. Alici, Kaan Guven

Proceedings Volume 5733, (2005) https://doi.org/10.1117/12.582778

KEYWORDS: Negative refraction, Interfaces, Photonic crystals, Refraction, Refractive index, Dielectrics, Finite-difference time-domain method, Wave propagation, Antennas, Anisotropy

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Proceedings Article | 13 April 2005 Paper

Highly directional enhanced radiation from sources embedded inside two- and three-dimensional photonic crystals

Humeyra Caglayan, Irfan Bulu, Ekmel Ozbay

Proceedings Volume 5733, (2005) https://doi.org/10.1117/12.587503

KEYWORDS: Photonic crystals, Antennas, Dielectrics, Wave propagation, Crystals, Solids, Free space, Radio propagation, Finite-difference time-domain method, Light emitting diodes

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Proceedings Article | 25 March 2005 Paper

High-performance solar-blind AlGaN photodetectors

Ekmel Ozbay, Turgut Tut, Necmi Biyikli

Proceedings Volume 5732, (2005) https://doi.org/10.1117/12.582491

KEYWORDS: Sensors, Photodiodes, Aluminum, Gallium, Gallium nitride, Photodetectors, Etching, Picosecond phenomena, Ultraviolet radiation, Quantum efficiency

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Proceedings Article | 21 June 2004 Paper

Investigation of AlGaN buffer layers on sapphire grown by MOVPE

Philipp van Gemmern, Yilmaz Dikme, Necmi Biyikli, Holger Kalisch, Ekmel Ozbay, Rolf Jansen, Michael Heuken

Proceedings Volume 5366, (2004) https://doi.org/10.1117/12.529952

KEYWORDS: Aluminum, Aluminum nitride, Sapphire, Spectroscopy, Gallium, Hydrogen, Light emitting diodes, Reflectivity, Transmittance, Optical testing

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Proceedings Article | 14 August 2003 Paper

Ultrafast and highly efficient resonant-cavity-enhanced photodiodes

Ekmel Ozbay, Ibrahim Kimukin, Necmi Biyikli

Proceedings Volume 5246, (2003) https://doi.org/10.1117/12.511202

KEYWORDS: Quantum efficiency, Photodetectors, Palladium, Mirrors, Photodiodes, Sensors, Reflectivity, Indium gallium arsenide, Gallium arsenide, Absorption

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Proceedings Article | 9 July 2003 Paper

Physics and applications of defect structures in photonic crystals

Ekmel Ozbay, Kaan Guven, Mehmet Bayindir

Proceedings Volume 5000, (2003) https://doi.org/10.1117/12.480055

KEYWORDS: Photonic crystals, Waveguides, Photons, Finite-difference time-domain method, Wave propagation, Dispersion, Radio propagation, Solids, Dielectrics, Switches

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Proceedings Article | 21 May 2002 Paper

High-speed visible-blind GaN-based ITO-Schottky photodiodes

Necmi Biyikli, Ibrahim Kimukin, Tolga Kartaloglu, Orhan Aytur, Ekmel Ozbay

Proceedings Volume 4650, (2002) https://doi.org/10.1117/12.467678

KEYWORDS: Photodiodes, Gallium nitride, Quantum efficiency, Gold, Ultraviolet radiation, Palladium, Thin films, Picosecond phenomena, Transparency, Microwave radiation

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Proceedings Article | 25 April 2002 Paper

Coupled cavities in photonic crystals

Ekmel Ozbay, Mehmet Bayindir, Ertugrul Cubukcu, Irhan Bulu

Proceedings Volume 4655, (2002) https://doi.org/10.1117/12.463865

KEYWORDS: Photonic crystals, Waveguides, Photons, Wave propagation, Dispersion, Radio propagation, Switching, Switches, Crystals, Dielectrics

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Proceedings Article | 13 April 2000 Paper

High-speed GaAs-based resonant-cavity-enhanced 1.3-um photodetector

Ekmel Ozbay, Ibrahim Kimukin, Necmi Biyikli, Gary Tuttle

Proceedings Volume 3948, (2000) https://doi.org/10.1117/12.382116

KEYWORDS: Quantum efficiency, Photodetectors, Mirrors, Gallium arsenide, Sensors, Photodiodes, Electrons, Telecommunications, Absorption, Metals

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Proceedings Article | 7 April 1999 Paper

Ultrafast photodetectors with near-unity quantum efficiency

Goekhan Ulu, Mutlu Goekkavas, M. Selim Unlu, Necmi Biyikli, Ekmel Ozbay, Orhan Aytur, Richard Mirin, David Christensen

Proceedings Volume 3629, (1999) https://doi.org/10.1117/12.344569

KEYWORDS: Sensors, Quantum efficiency, Photodetectors, Absorption, Reflectivity, Picosecond phenomena, Mirrors, Diffusion, Semiconducting wafers, Ultrafast phenomena

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Proceedings Article | 7 April 1999 Paper

High-speed high-efficiency resonant-cavity-enhanced photodiodes

Ekmel Ozbay, Ibrahim Kimukin, Necmi Biyikli, Orhan Aytur, Mutlu Goekkavas, Goekhan Ulu, M. Selim Unlu, Richard Mirin, Kristine Bertness, David Christensen, Elias Towe, Gary Tuttle

Proceedings Volume 3629, (1999) https://doi.org/10.1117/12.344566

KEYWORDS: Photodiodes, Quantum efficiency, Gallium arsenide, Mirrors, Etching, Photodetectors, Reflectivity, Telecommunications, Metals, Picosecond phenomena

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Proceedings Article | 26 March 1999 Paper

Widely tunable resonant cavity enhanced detectors built around photonic crystals

Burak Temelkuran, Ekmel Ozbay

Proceedings Volume 3620, (1999) https://doi.org/10.1117/12.343753

KEYWORDS: Photonic crystals, Sensors, Microwave radiation, Crystals, Mirrors, Dielectrics, Absorption, Antennas, Network security, Reflectivity

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Proceedings Article | 22 December 1997 Paper

Ultrafast resonant-cavity-enhanced Schottky photodiodes

M. Selim Unlu, Bora Onat, Mutlu Goekkavas, Ekmel Ozbay, Erhan Ata, Elias Towe, Gary Tuttle, Richard Mirin, David Christensen

Proceedings Volume 3290, (1997) https://doi.org/10.1117/12.298261

KEYWORDS: Quantum efficiency, Photodiodes, Picosecond phenomena, Metals, Absorption, Sensors, Dielectrics, Photodetectors, Gallium arsenide, Gold

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Proceedings Article | 19 August 1994 Paper

All-electronic generation and detection of terahertz free-space pulses and their application to a terahertz spectroscopy system

J. Bostak, David Bloom, Daniel van der Weide, B. Auld, Ekmel Ozbay

Proceedings Volume 2211, (1994) https://doi.org/10.1117/12.183017

KEYWORDS: Terahertz radiation, Signal detection, Picosecond phenomena, Antennas, Spectroscopy, Terahertz spectroscopy, Fabry–Perot interferometers, Integrated circuits, Manufacturing, Phase measurement

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Proceedings Article | 2 June 1994 Paper

All-electronic generation and detection of terahertz free-space pulses and their application to a terahertz spectroscopy system

David Bloom, J. Bostak, Daniel van der Weide, B. Auld, Ekmel Ozbay

Proceedings Volume 2145, (1994) https://doi.org/10.1117/12.177141

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Proceedings Article | 15 October 1993 Paper

Ultrafast measurements of 200-GHz GaAs Schottky photodiodes

Katheryn Li-Dessau, E. Ozbay, A. Hou, J. Sheridan, David Bloom

Proceedings Volume 2022, (1993) https://doi.org/10.1117/12.158576

KEYWORDS: Photodiodes, Microwave radiation, Sensors, Picosecond phenomena, Photodetectors, Diodes, Gallium arsenide, Electro optics, Oscilloscopes, Doping

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Showing 5 of 63 publications

Proceedings Volume Editor (5)

SPIE Conference Volume | 8 July 2016

Metamaterials X

SPIE Conference Volume | 15 May 2014

Metamaterials IX

SPIE Conference Volume | 28 April 2010

Metamaterials V

SPIE Conference Volume | 28 May 2008

Metamaterials III

SPIE Conference Volume | 26 September 2005

Metamaterials

Conference Committee Involvement (47)

Photonic and Phononic Properties of Engineered Nanostructures XV

25 January 2025 | San Francisco, California, United States

Photonic and Phononic Properties of Engineered Nanostructures XIV

29 January 2024 | San Francisco, California, United States

Metamaterials XIV

26 April 2023 | Prague, Czech Republic

Photonic and Phononic Properties of Engineered Nanostructures XIII

30 January 2023 | San Francisco, California, United States

Photonic and Phononic Properties of Engineered Nanostructures XII

24 January 2022 | San Francisco, California, United States

Metamaterials XIII

19 April 2021 | Online Only, Czech Republic

Photonic and Phononic Properties of Engineered Nanostructures XI

6 March 2021 | Online Only, California, United States

Photonic and Phononic Properties of Engineered Nanostructures X

3 February 2020 | San Francisco, California, United States

Metamaterials

3 April 2019 | Prague, Czech Republic

Photonic and Phononic Properties of Engineered Nanostructures IX

4 February 2019 | San Francisco, California, United States

Photonic and Phononic Properties of Engineered Nanostructures VIII

29 January 2018 | San Francisco, California, United States

Photonic and Phononic Properties of Engineered Nanostructures VII

30 January 2017 | San Francisco, California, United States

Quantum Sensing and Nano Electronics and Photonics XIV

29 January 2017 | San Francisco, California, United States

Metamaterials

4 April 2016 | Brussels, Belgium

Photonic and Phononic Properties of Engineered Nanostructures VI

15 February 2016 | San Francisco, California, United States

Quantum Sensing and Nano Electronics and Photonics XIII

14 February 2016 | San Francisco, California, United States

Photonic and Phononic Properties of Engineered Nanostructures V

9 February 2015 | San Francisco, California, United States

Quantum Sensing and Nanophotonic Devices XII

8 February 2015 | San Francisco, California, United States

Metamaterials

14 April 2014 | Brussels, Belgium

Photonic and Phononic Properties of Engineered Nanostructures IV

3 February 2014 | San Francisco, California, United States

Quantum Sensing and Nanophotonic Devices XI

2 February 2014 | San Francisco, California, United States

Photonic and Phononic Properties of Engineered Nanostructures III

3 February 2013 | San Francisco, California, United States

Photonic and Phononic Properties of Engineered Nanostructures II

23 January 2012 | San Francisco, California, United States

Integrated Photonics: Materials, Devices and Applications

18 April 2011 | Prague, Czech Republic

Photonic and Phononic Properties of Engineered Nanostructures

24 January 2011 | San Francisco, California, United States

Metamaterials

12 April 2010 | Brussels, Belgium

Photonic and Phononic Crystal Materials and Devices IX

26 January 2010 | San Francisco, California, United States

Photonic Materials, Devices, and Applications

4 May 2009 | Dresden, Germany

Metamaterials IV

20 April 2009 | Prague, Czech Republic

Photonic and Phononic Crystal Materials and Devices VIII

27 January 2009 | San Jose, California, United States

Metamaterials

7 April 2008 | Strasbourg, France

Photonic Crystal Materials and Devices VII

21 January 2008 | San Jose, California, United States

Optoelectronic Devices: Physics, Fabrication, and Application IV

11 September 2007 | Boston, MA, United States

Photonic Materials, Devices, and Applications

2 May 2007 | Maspalomas, Gran Canaria, Spain

Metamaterials

16 April 2007 | Prague, Czech Republic

Photonic Crystal Materials and Devices VI

22 January 2007 | San Jose, California, United States

Nanomaterial Synthesis and Integration for Sensors, Electronics, Photonics, and Electro-Optics

1 October 2006 | Boston, Massachusetts, United States

Optoelectronic Devices: Physics, Fabrication, and Application III

1 October 2006 | Boston, Massachusetts, United States

Photonic Crystal Materials and Devices IV

23 January 2006 | San Jose, California, United States

Nanosensing: Materials and Devices II

23 October 2005 | Boston, MA, United States

Photonic Crystals and Fibers

30 August 2005 | Warsaw, Poland

Metamaterials

30 August 2005 | Warsaw, Poland

Photonic Materials, Devices, and Applications

9 May 2005 | Sevilla, Spain

Photonic Crystal Materials and Devices III

24 January 2005 | San Jose, California, United States

Nanosensing: Materials and Devices

25 October 2004 | Philadelphia, Pennsylvania, United States

Photonic Crystal Materials and Devices II

26 January 2004 | San Jose, CA, United States

Photonic Crystal Materials and Devices

29 January 2003 | San Jose, CA, United States

Showing 5 of 47 Conference Committees

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