Prof. A. G. Unil Perera Profile

Prof. A. G. Unil Perera

Regents’ Professor at Georgia State Univ

SPIE Involvement:

Author

Publications (37)

Proceedings Article | 21 February 2020 Paper

Quantification of infrared spectral markers for ulcerative colitis using sera

A. G. Unil Perera, Hemendra Ghimire

Proceedings Volume 11236, 112360T (2020) https://doi.org/10.1117/12.2545096

KEYWORDS: Decision support systems, Statistical analysis, Absorbance, Infrared radiation, Proteins, Spectroscopy, Diagnostics, Infrared spectroscopy, FT-IR spectroscopy, Data modeling

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Proceedings Article | 9 September 2019 Presentation + Paper

Threshold wavelength extension with dark current reduction in infrared detectors

A. G. Unil Perera, Hemendra Ghimire

Proceedings Volume 11128, 1112809 (2019) https://doi.org/10.1117/12.2531639

KEYWORDS: Sensors, Infrared detectors, 3D modeling, Quantum well infrared photodetectors, Aluminum, Photodetectors, Infrared sensors, Infrared radiation, Sensor performance, Gallium arsenide

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Proceedings Article | 30 May 2017 Presentation + Paper

Infrared spectroscopy as a screening technique for colitis

Jitto Titus, Hemendra Ghimire, Emilie Viennois, Didier Merlin, A. G. Unil Perera

Proceedings Volume 10247, 102470C (2017) https://doi.org/10.1117/12.2264462

KEYWORDS: Inflammation, Endoscopy, Colon, Infrared radiation, Biological research, Infrared signatures, Attenuated total reflectance, FT-IR spectroscopy, Spectroscopy, Absorbance, Spectral resolution, Proteins, Infrared spectroscopy, Sensing systems, Diagnostics, Biomedical optics, Colorectal cancer

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SPIE Journal Paper | 7 February 2017

Extended wavelength infrared photodetectors

Dilip Chauhan, A. G. Unil Perera, Lianhe Li, Li Chen, Suraj Khanna, Edmund Linfield

OE, Vol. 56, Issue 09, 091605, (February 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.9.091605

KEYWORDS: Aluminum, Sensors, Gallium, Infrared radiation, Photodetectors, Infrared photography, Infrared detectors, Phonons, Lithium, Heterojunctions

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Proceedings Article | 3 February 2017 Paper

Mid-infrared detection in p-GaAs/AlGaAs heterostructures with a current blocking barrier

Dilip Chauhan, A. G. Unil Perera, Lianhe Li, Li Chen, Edmund Linfield

Proceedings Volume 10036, 1003615 (2017) https://doi.org/10.1117/12.2242898

KEYWORDS: Heterojunctions, Mid-IR, Photovoltaics, Sensors, Aluminum, Gallium, Optical filters, Photodetectors, Infrared detectors, Infrared imaging

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Proceedings Article | 12 May 2016 Paper

Infrared photodetector with wavelength extension beyond the spectral limit

A. G. Perera, Dilip Chauhan, Yan-Feng Lao, Lianhe Li, Suraj Khanna, Edmund Linfield

Proceedings Volume 9844, 98440X (2016) https://doi.org/10.1117/12.2225264

KEYWORDS: Optical filters, Sensors, Solar energy, Infrared radiation, Photodetectors, Infrared detectors, FT-IR spectroscopy, Infrared photography, Temperature metrology, Infrared sensors

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Proceedings Article | 29 March 2013 Paper

Multi-spectral InAs/GaAs-based quantum dot infrared photodetector with quaternary (InAlGaAs) capping operates at low bias voltage

Sourav Adhikary, Subhananda Chakrabarti, Yigit Aytac, A.G.U. Perera

Proceedings Volume 8634, 86340V (2013) https://doi.org/10.1117/12.2002730

KEYWORDS: Photodetectors, Infrared radiation, Quantum dots, Infrared photography, Gallium arsenide, Indium arsenide, Quantum well infrared photodetectors, Long wavelength infrared, Infrared imaging, Mid-IR

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Proceedings Article | 15 October 2012 Paper

Effect of nucleation period on the physical properties of InN epilayers

S. Gamage, M. K. Senevirathna, R. Atalay, A. G. Perera, A. Melton, I. Ferguson, N. Dietz

Proceedings Volume 8484, 84841I (2012) https://doi.org/10.1117/12.930363

KEYWORDS: Indium nitride, Raman spectroscopy, Spectroscopy, Dielectrics, X-ray diffraction, FT-IR spectroscopy, Optoelectronics, Reflectance spectroscopy, Chemical vapor deposition, Nitrogen

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Proceedings Article | 15 October 2012 Paper

Effect of V/III molar ratio on the structural and optical properties of InN epilayers grown by HPCVD

Ramazan Atalay, Max Buegler, Sampath Gamage, M. K. Senevirathna, Bahadir Küçükgök, Andrew Melton, Axel Hoffmann, A. G. Unil Perera, Ian Ferguson, Nikolaus Dietz

Proceedings Volume 8484, 84840X (2012) https://doi.org/10.1117/12.930199

KEYWORDS: Indium nitride, Raman spectroscopy, Phonons, FT-IR spectroscopy, Infrared spectroscopy, Optoelectronics, Crystals, X-ray diffraction, Reflectance spectroscopy, Spectroscopy

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Proceedings Article | 31 May 2012 Paper

Demonstration of high responsivity(~2.16 A/W) and detectivity(~1011 Jones) in the long wavelength (~10.2μm) from InGaAs/GaAs quantum dot infrared photodetector with quaternary InAlGaAs capping

Subhananda Chakrabarti, Sourav Adhikary, Nilanjan Halder, Yigit Aytac, A. G. Perera

Proceedings Volume 8353, 835338 (2012) https://doi.org/10.1117/12.918988

KEYWORDS: Gallium arsenide, Heterojunctions, Quantum dots, Quantum well infrared photodetectors, Infrared detectors, Infrared radiation, Photodetectors, Infrared photography, Quantum IR detectors, Molecular beam epitaxy

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Proceedings Article | 24 January 2011 Paper

Room temperature photovoltaic response of split-off band infrared detectors with a graded barrier

A. G. U. Perera, S. Matsik, D. P. Pitigala, Y. F. Lao, S. P. Khanna, L. H. Li, E. Linfield, Z. Wasilewski, M. Buchanan, X. H. Wu, H. C. Liu

Proceedings Volume 7945, 79451I (2011) https://doi.org/10.1117/12.870047

KEYWORDS: Sensors, Photovoltaics, Solar energy, Superlattices, Gallium arsenide, Infrared detectors, Aluminum, Infrared sensors, Absorption, Scattering

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Proceedings Article | 4 May 2010 Paper

Spin split-off band-based high operating temperature IR detectors in 3-5 µm and beyond

A. G. Perera, S. Matsik, M. Shishodia, R. Jayasinghe, P. K. D. D. Pitigala

Proceedings Volume 7660, 766030 (2010) https://doi.org/10.1117/12.850234

KEYWORDS: Sensors, Absorption, Scattering, Doping, Infrared detectors, Phonons, Gallium nitride, Terahertz radiation, Gallium arsenide, Sensor performance

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Proceedings Article | 29 April 2010 Paper

Performance enhancements of dye sensitized nanostructured solar cells using PbS quantum dots

P. K. D. D. P. Pitigala, K. Tennakone, A. G. U. Perera

Proceedings Volume 7683, 768318 (2010) https://doi.org/10.1117/12.851812

KEYWORDS: Lead, Zinc oxide, Quantum dots, Solar cells, Semiconductors, Absorption, Nanostructuring, Dysprosium, Dye sensitized solar cells, Molecules

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Proceedings Article | 23 January 2010 Paper

GaAs and GaN based high operating temperature spin split-off band infrared detectors

A. G. Unil Perera, S. Matsik, M. Shishodia, R. Jayasinghe

Proceedings Volume 7608, 760823 (2010) https://doi.org/10.1117/12.847241

KEYWORDS: Sensors, Scattering, Absorption, Gallium nitride, Terahertz radiation, Doping, Gallium arsenide, Phonons, Infrared detectors, Infrared sensors

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Proceedings Article | 28 August 2009 Paper

Al fraction induced effects on the capacitance characteristics of n+-GaN/AlxGa1-xN IR detectors

Laura Byrum, Gamini Ariyawansa, Ranga Jayasinghe, Nikolaus Dietz, A. G. Unil Perera, Steven Matsik, Ian Ferguson, Andrew Bezinger, Hui Chun Liu

Proceedings Volume 7467, 74670W (2009) https://doi.org/10.1117/12.828156

KEYWORDS: Capacitance, Aluminum, Sensors, Infrared detectors, Gallium nitride, Heterojunctions, Absorption, Ultraviolet radiation, Infrared sensors, Interfaces

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Proceedings Article | 3 September 2008 Paper

Uncooled semiconductor detectors for IR to UV remote sensing

A. G. Unil Perera

Proceedings Volume 7082, 70820A (2008) https://doi.org/10.1117/12.797228

KEYWORDS: Sensors, Infrared sensors, Quantum dots, Temperature metrology, Infrared detectors, Ultraviolet radiation, Capacitors, Gallium arsenide, Absorption, Infrared detection

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Proceedings Article | 11 March 2008 Paper

Ultraviolet-to-infrared dual-band detectors based on quantum dot and heterojunction structures

A. G. Unil Perera

Proceedings Volume 6984, 698432 (2008) https://doi.org/10.1117/12.792385

KEYWORDS: Ultraviolet radiation, Sensors, Infrared sensors, Infrared radiation, Infrared detectors, Gallium nitride, Heterojunctions, Quantum dots, Aluminum, Ultraviolet detectors

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Proceedings Article | 26 September 2007 Paper

Dual band HEIWIP detectors with nitride materials

A. Unil Perera, Gamini Ariyawansa, Ranga Jayasinghe, Laura Byrum, Nikolaus Dietz, Steven Matsik, Ian Ferguson, Hui Luo, Andrew Bezinger, Hui Chun Liu

Proceedings Volume 6678, 66780S (2007) https://doi.org/10.1117/12.734731

KEYWORDS: Ultraviolet radiation, Sensors, Infrared radiation, Infrared sensors, Ultraviolet detectors, Absorption, Modulation, Gallium nitride, Aluminum, Etching

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Proceedings Article | 2 February 2007 Paper

III-V based THz detectors and plasmon effects

A. Perera

Proceedings Volume 6479, 64790O (2007) https://doi.org/10.1117/12.693068

KEYWORDS: Sensors, Terahertz radiation, Plasmons, Absorption, Metals, Gallium arsenide, Doping, Gallium nitride, Aluminum, Oxides

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Proceedings Article | 18 November 2005 Paper

Heterojunction detectors for terahertz applications

A. G. Perera

Proceedings Volume 6010, 601004 (2005) https://doi.org/10.1117/12.629927

KEYWORDS: Sensors, Terahertz radiation, Doping, Gallium arsenide, Absorption, Aluminum, Heterojunctions, Interfaces, Gallium nitride, Quantum well infrared photodetectors

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Proceedings Article | 29 September 2005 Paper

Quantum structures for multiband photon detection

A. G. U. Perera

Proceedings Volume 5957, 59570W (2005) https://doi.org/10.1117/12.620635

KEYWORDS: Sensors, Gallium arsenide, Infrared detectors, Near infrared, Quantum dots, Quantum wells, Silicon, Heterojunctions, Photodetectors, Infrared radiation

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Proceedings Article | 4 November 2004 Paper

Three-color quantum dots in a well infrared photodetector

Sanjay Krishna, Sunil Raghavan, Greg von Winckel, Andreas Stintz, Gamini Ariyawansa, Steven Matsik, Unil Perera, Dang Le, David Cardimona

Proceedings Volume 5543, (2004) https://doi.org/10.1117/12.561344

KEYWORDS: Sensors, Quantum dots, Quantum wells, Infrared radiation, Infrared sensors, Mid-IR, Long wavelength infrared, Far infrared, Gallium arsenide, Quantum well infrared photodetectors

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Proceedings Article | 1 July 2003 Paper

Resonant cavity enhanced GaAs/AlGaAs IR detectors

Dmitrii Esaev, S. Matsik, M. Rinzan, A. G. Unil Perera, Hui Liu, Zbigniew Wasilewski, Margaret Buchanan

Proceedings Volume 4999, (2003) https://doi.org/10.1117/12.475401

KEYWORDS: Absorption, Doping, Sensors, Gallium arsenide, Skin, Infrared detectors, Aluminum, Solids, Etching, Infrared sensors

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Proceedings Article | 1 July 2003 Paper

Evolution of quantum detectors from VLWIR to FIR

A. G. Unil Perera

Proceedings Volume 4999, (2003) https://doi.org/10.1117/12.479619

KEYWORDS: Sensors, Absorption, Doping, Gallium arsenide, Infrared detectors, Quantum well infrared photodetectors, Aluminum, Silicon, Infrared sensors, Far infrared

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Proceedings Article | 12 June 2001 Paper

Heterojunction interfacial workfunction detectors for far-infrared applications

A. G. Unil Perera, S. Matsik, Viatcheslav Letov, Hui Liu, Aidong Shen, Ming Gao, Zbigniew Wasilewski, Margaret Buchanan, S. Rolfe

Proceedings Volume 4288, (2001) https://doi.org/10.1117/12.429422

KEYWORDS: Sensors, Quantum well infrared photodetectors, Absorption, Doping, Capacitance, Gallium arsenide, Heterojunctions, Aluminum, Interfaces, Far infrared

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Proceedings Article | 29 November 2000 Paper

Novel Si homojunction far-infrared detectors

W. Shen, A. G. Unil Perera

Proceedings Volume 4086, (2000) https://doi.org/10.1117/12.408411

KEYWORDS: Sensors, Silicon, Doping, Quantum efficiency, Absorption, Performance modeling, Physics, Infrared sensors, Diffusion, Far infrared

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Proceedings Article | 8 April 1999 Paper

Novel far-infrared detectors for space applications

A. G. Unil Perera, W. Shen, Hui Liu, Margaret Buchanan, William Schaff

Proceedings Volume 3725, (1999) https://doi.org/10.1117/12.344746

KEYWORDS: Sensors, Quantum efficiency, Gallium arsenide, Silicon, Interfaces, Information operations, Absorption, Space telescopes, Doping, Far infrared

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Proceedings Article | 21 August 1998 Paper

GaAs homojunction far-infrared detectors for astronomy applications

A. G. Unil Perera, W. Shen, M. Francombe, Mark Shure, Hui Liu, Margaret Buchanan, William Schaff

Proceedings Volume 3354, (1998) https://doi.org/10.1117/12.317293

KEYWORDS: Sensors, Quantum efficiency, Absorption, Gallium arsenide, Doping, Silicon, Scattering, Astronomy, Staring arrays, Far infrared

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Proceedings Article | 11 August 1998 Paper

Si homojunction internal photoemission far-infrared detectors

A. G. Unil Perera, W. Shen, Hui Liu, Margaret Buchanan, Michael Tanner, Kang Wang

Proceedings Volume 3553, (1998) https://doi.org/10.1117/12.318097

KEYWORDS: Sensors, Silicon, Doping, Quantum efficiency, Absorption, Performance modeling, Infrared sensors, Molecular beam epitaxy, Staring arrays, Far infrared

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Proceedings Article | 8 April 1998 Paper

High-performance GaAs homojunction far-infrared detectors

A. G. Unil Perera, W. Shen, Hui Liu, Margaret Buchanan, William Schaff

Proceedings Volume 3287, (1998) https://doi.org/10.1117/12.304491

KEYWORDS: Sensors, Absorption, Quantum efficiency, Gallium arsenide, Doping, Silicon, Interfaces, Multilayers, Scattering, Far infrared

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Proceedings Article | 22 October 1996 Paper

GaAs homojunction interfacial workfunction internal photoemission far-infrared detectors

Henry Yuan, A. G. Unil Perera, M. Francombe, Sisira Gamage, Hui Liu, Margaret Buchanan, William Schaff

Proceedings Volume 2816, (1996) https://doi.org/10.1117/12.255156

KEYWORDS: Sensors, Doping, Gallium arsenide, Quantum efficiency, Absorption, Temperature metrology, Photons, Silicon, Neon, Interfaces

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Proceedings Article | 17 June 1996 Paper

Infrared detection with spontaneous pulsing in multiquantum well structures

A. G. Unil Perera, S. Matsik, M. Francombe

Proceedings Volume 2746, (1996) https://doi.org/10.1117/12.243035

KEYWORDS: Electrons, Quantum wells, Absorption, Sensors, Ionization, Infrared radiation, Capacitors, Diodes, Infrared detection, Quantum efficiency

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Proceedings Article | 1 September 1995 Paper

Homojunction interfacial workfunction internal photoemission (HIWIP) infrared detectors

A. G. Unil Perera

Proceedings Volume 2554, (1995) https://doi.org/10.1117/12.218183

KEYWORDS: Sensors, Silicon, Absorption, Scattering, Interfaces, Doping, Neodymium, Quantum efficiency, Infrared detectors, Internal quantum efficiency

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Proceedings Article | 16 June 1995 Paper

Nonlinear dynamics in a neural network (parallel) processor

A. G. Unil Perera, S. Matsik, S. Betarbet

Proceedings Volume 2488, (1995) https://doi.org/10.1117/12.211986

KEYWORDS: Diodes, Neurons, Parallel computing, Interfaces, Neural networks, Nonlinear dynamics, Capacitance, Nonlinear filtering, Linear filtering, Brain mapping

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Proceedings Article | 6 June 1995 Paper

Novel homojunction interfacial workfunction internal photoemission (HIWIP) tunable far-infrared detectors for astronomy

A. G. Unil Perera, Henry Yuan, Jeong-Woo Choe, M. Francombe

Proceedings Volume 2475, (1995) https://doi.org/10.1117/12.211244

KEYWORDS: Sensors, Neodymium, Silicon, Electrons, Germanium, Absorption, Doping, Scattering, Quantum efficiency, Interfaces

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Proceedings Article | 1 October 1991 Paper

IR detection at wavelengths up to 200 microns in extrinsic semiconductor devices

A. G. U. Perera

Proceedings Volume 1576, 15766I (1991) https://doi.org/10.1117/12.2297947

KEYWORDS: Silicon, Sensors, Germanium, Infrared detection, Semiconductors, Indium gallium arsenide, Absorption, Far infrared, Statistical analysis, Transition metals

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Proceedings Article | 1 September 1990 Paper

Photon detection with parallel-asynchronous processing

Darryl Coon, A. G. Unil Perera

Proceedings Volume 1360, (1990) https://doi.org/10.1117/12.24176

KEYWORDS: Image processing, Sensors, Photodetectors, Signal processing, Silicon, Diodes, Infrared detectors, Visual communications, Data modeling, Semiconducting wafers

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Showing 5 of 37 publications

Conference Committee Involvement (3)

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

25 April 2011 | Orlando, Florida, United States

Energy Harvesting and Storage: Materials, Devices, and Applications

5 April 2010 | Orlando, Florida, United States

Quantum Sensing: Evolution and Revolution from Past to Future

27 January 2003 | San Jose, CA, United States

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