Dr. Timothy Ashley Profile

Dr. Timothy Ashley

at QinetiQ Ltd

SPIE Involvement:

Author

Publications (23)

Proceedings Article | 11 September 2010 Paper

Mid-infrared GaInSb quantum well laser structures: a comparison of their characterisation using photoluminescence, photo-modulated reflectance, and FTIR-based surface photovoltage spectroscopies

Natasha Fox, A. Andreev, G. Nash, T. Ashley, T. J. Hosea

Proceedings Volume 7755, 77550C (2010) https://doi.org/10.1117/12.861159

KEYWORDS: Quantum wells, Surface plasmons, Reflectivity, Luminescence, FT-IR spectroscopy, Mid-IR, Spectroscopy, Modulation, Gallium arsenide, Quantum cascade lasers

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Proceedings Article | 14 May 2007 Paper

Recent advances in negative luminescent technologies

Stuart Smith, Mary Haigh, Neil Gordon, James Edwards, David Hall, Alan Hydes, Andrew Graham, Jean Giess, Janet Hails, Geoffrey Nash, Tim Ashley

Proceedings Volume 6542, 65420Z (2007) https://doi.org/10.1117/12.723652

KEYWORDS: Silicon, Infrared cameras, Thermography, Infrared radiation, Infrared sensors, Temperature metrology, Mercury, Cadmium, Tellurium, Sensors

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Proceedings Article | 17 May 2006 Paper

Dilute antimonide nitrides for very long wavelength infrared applications

Tim Ashley, Louise Buckle, Gilbert Smith, Ben Murdin, Paul Jefferson, Louis F. Piper, Tim Veal, Chris McConville

Proceedings Volume 6206, 62060L (2006) https://doi.org/10.1117/12.667232

KEYWORDS: Nitrogen, Antimony, Gallium antimonide, Gallium nitride, Gallium, Indium nitride, Absorption, Long wavelength infrared, Plasma, Indium

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Proceedings Article | 17 May 2006 Paper

Integrated infrared detectors and readout circuits

John Cairns, Louise Buckle, Graham Pryce, Janet Hails, Jean Giess, Mark Crouch, David Hall, Alan Hydes, Andrew Graham, Andrew Wright, Colin Hollier, David Lees, Neil Gordon, Timothy Ashley

Proceedings Volume 6206, 620614 (2006) https://doi.org/10.1117/12.674017

KEYWORDS: Readout integrated circuits, Sensors, Silicon, Semiconducting wafers, Infrared detectors, Staring arrays, Infrared radiation, Crystals, Etching, Infrared sensors

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Proceedings Article | 31 May 2005 Paper

Photomultiplication with low excess noise factor in MWIR to optical fiber compatible wavelengths in cooled HgCdTe mesa diodes

Ralph Hall, Neil Gordon, Jean Giess, Janet Hails, Andrew Graham, David Herbert, David Hall, Paul Southern, John Cairns, David Lees, Timothy Ashley

Proceedings Volume 5783, (2005) https://doi.org/10.1117/12.603386

KEYWORDS: Mercury cadmium telluride, Ionization, Mid-IR, Diodes, Sensors, Silicon, Cadmium, Avalanche photodetectors, Doping, Short wave infrared radiation

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Proceedings Article | 31 May 2005 Paper

Progress in negative luminescent Hg_1-xCd_xTe diode arrays

Mary Haigh, Geoffrey Nash, Neil Gordon, James Edwards, Alan Hydes, David Hall, Andrew Graham, Jean Giess, Janet Hails, Tim Ashley

Proceedings Volume 5783, (2005) https://doi.org/10.1117/12.603292

KEYWORDS: Resistance, Silicon, Diodes, Solar concentrators, Cameras, Infrared cameras, Dry etching, Cadmium, Thermography, Mercury

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Proceedings Article | 22 October 2004 Paper

Optimizing indium aluminum antimonide LEDs and photodiodes for gas sensing applications

Harvey Hardaway, Tim Ashley, Louise Buckle, Martin Emeny, Graeme Masterton, Graham Pryce

Proceedings Volume 5564, (2004) https://doi.org/10.1117/12.560577

KEYWORDS: Light emitting diodes, Photodiodes, Resistance, Sensors, Diodes, Amplifiers, Aluminum, Indium, Carbon dioxide, Infrared sensors

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Proceedings Article | 30 August 2004 Paper

Long-wavelength infrared focal plane arrays fabricated from HgCdTe grown on silicon substrates

David Hall, Louise Buckle, Neil Gordon, Jean Giess, Janet Hails, John Cairns, Rebecca Lawrence, Andrew Graham, Ralph Hall, Corinne Maltby, Tim Ashley

Proceedings Volume 5406, (2004) https://doi.org/10.1117/12.545003

KEYWORDS: Silicon, Diodes, Semiconducting wafers, Staring arrays, Mercury cadmium telluride, Multiplexing, Sensors, Gallium arsenide, Infrared detectors, Metals

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Proceedings Article | 30 August 2004 Paper

Albion camera: a high-performance infrared imaging system

David Huckridge, Tim Ashley, John Beale, Ian Blenkinsop, Gavin Bowen, David Lees, Tim Phillips, Richard Price

Proceedings Volume 5406, (2004) https://doi.org/10.1117/12.548879

KEYWORDS: Cameras, Imaging systems, Sensors, Electronics, Calibration, Digital signal processing, Signal processing, Video, Video processing, Thermography

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Proceedings Article | 6 July 2004 Paper

Higher-operating-temperature high-performance infrared focal plane arrays

Tim Ashley, Neil Gordon

Proceedings Volume 5359, (2004) https://doi.org/10.1117/12.531398

KEYWORDS: Sensors, Diodes, Aluminum, Antimony, Solar concentrators, Mid-IR, Doping, Temperature metrology, Infrared radiation, Staring arrays

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Proceedings Article | 19 February 2004 Paper

Infrared negative luminescent devices and higher operating temperature detectors

Geoff Nash, Neil Gordon, David Hall, J. Chris Little, G. Masterton, J. Hails, J. Giess, L. Haworth, Martin Emeny, Tim Ashley

Proceedings Volume 5251, (2004) https://doi.org/10.1117/12.517147

KEYWORDS: Diodes, Thermography, Sensors, Infrared radiation, Infrared imaging, Infrared sensors, Solar concentrators, Aluminum, Infrared detectors, Antimony

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Proceedings Article | 10 October 2003 Paper

Epitaxial InSb for elevated temperature operation of large IR focal plane arrays

Tim Ashley, Theresa Burke, Martin Emeny, Neil Gordon, David Hall, David Lees, J. Chris Little, Daniel Milner

Proceedings Volume 5074, (2003) https://doi.org/10.1117/12.503527

KEYWORDS: Aluminum, Diodes, Antimony, Sensors, Indium, Staring arrays, Resistance, Temperature metrology, Etching, Solar concentrators

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Proceedings Article | 12 September 2003 Paper

Perspectives on dynamic infrared scene projection using positive and negative luminescence

Geoff Nash, Neil Gordon, Martin Emeny, Tim Ashley

Proceedings Volume 5092, (2003) https://doi.org/10.1117/12.512651

KEYWORDS: Solar concentrators, Infrared radiation, Photodiodes, Medium wave, Projection systems, Integrated optics, Sensors, Luminescence, Temperature metrology, Thermography

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Proceedings Article | 23 January 2003 Paper

Large-area IR negative luminescent devices

Geoff Nash, Tim Ashley, Neil Gordon, C. Jones, C. Maxey, R. Catchpole

Proceedings Volume 4820, (2003) https://doi.org/10.1117/12.451968

KEYWORDS: Solar concentrators, Semiconductors, Etching, Thermography, Integrated optics, Diodes, Sensors, Infrared radiation, Infrared cameras, Calibration

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Proceedings Article | 23 January 2003 Paper

Large-format MWIR focal plane arrays

Tim Ashley, Ronald Ballingall, John Beale, Ian Blenkinsop, Theresa Burke, Jim Firkins, David Hall, Leslie Hipwood, Colin Hollier, Peter Knowles, David Lees, J. Chris Little, Chris Shaw

Proceedings Volume 4820, (2003) https://doi.org/10.1117/12.451971

KEYWORDS: Sensors, Diodes, Staring arrays, Readout integrated circuits, Mid-IR, Silicon, Imaging systems, Indium, Imaging arrays, Doping

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Proceedings Article | 12 June 2002 Paper

Improved performance from InAlSb/InSb superlattice mid-infrared diode lasers

Tim Ashley, Alfred Adams, Peter Blood, Alexi Andreev, Theresa Burke, Eoin O'Reilly, Graham Pryce

Proceedings Volume 4646, (2002) https://doi.org/10.1117/12.470572

KEYWORDS: Aluminum, Antimony, Superlattices, Semiconductor lasers, Mid-IR, FT-IR spectroscopy, Heterojunctions, Temperature metrology, Physics, Molecular beam epitaxy

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Proceedings Article | 19 November 2001 Paper

Micromachined optical concentrators for IR negative-luminescent devices

Geoff Nash, Tim Ashley, Neil Gordon, T. Phillips, C. Maxey, C. Jones, R. Catchpole

Proceedings Volume 4446, (2001) https://doi.org/10.1117/12.448818

KEYWORDS: Solar concentrators, Etching, Infrared cameras, Semiconductors, Polymers, Infrared radiation, Plasma, Infrared sensors, Thermography, Mercury cadmium telluride

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Proceedings Article | 18 August 2000 Paper

Micromachined optical concentrators for IR LEDs

Geoff Nash, Tim Ashley, David Dutton, Neil Gordon, T. Phillips

Proceedings Volume 4179, (2000) https://doi.org/10.1117/12.395681

KEYWORDS: Solar concentrators, Etching, Semiconductors, Light emitting diodes, Polymers, Plasma, Lenses, Refractive index, Plasma etching, Gallium arsenide

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Proceedings Article | 17 July 2000 Paper

InSb focal plane array (FPAs) grown by molecular beam epitaxy (MBE)

Tim Ashley, Ian Baker, Theresa Burke, David Dutton, John Haigh, Leslie Hipwood, Richard Jefferies, Alan Johnson, Peter Knowles, J. Chris Little

Proceedings Volume 4028, (2000) https://doi.org/10.1117/12.391753

KEYWORDS: Sensors, Staring arrays, Doping, Semiconducting wafers, Diodes, Tellurium, Molecular beam epitaxy, Absorption, External quantum efficiency, Infrared detectors

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Proceedings Article | 20 April 1998 Paper

Optical concentrators for light-emitting diodes

Tim Ashley, David Dutton, Charles Elliott, Neil Gordon, T. Phillips

Proceedings Volume 3289, (1998) https://doi.org/10.1117/12.305488

KEYWORDS: Solar concentrators, Etching, Light emitting diodes, Semiconductors, Luminescence, Doping, Calibration, Oxygen, Plasma, Reactive ion etching

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Proceedings Article | 8 April 1998 Paper

Epitaxial structures for reduced cooling of high-performance infrared detectors

Tim Ashley, Neil Gordon

Proceedings Volume 3287, (1998) https://doi.org/10.1117/12.304486

KEYWORDS: Sensors, Infrared detectors, Mercury cadmium telluride, Diodes, Resistance, Indium, Doping, Heterojunctions, Aluminum, Infrared radiation

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Proceedings Article | 7 April 1998 Paper

4- to 10-um positive and negative luminescent diodes

Tim Ashley, J. Beswick, J. Crowder, David Dutton, Charles Elliott, Neil Gordon, Alan Johnson, C. Maxey, Graham Pryce, Chang Wang

Proceedings Volume 3279, (1998) https://doi.org/10.1117/12.304415

KEYWORDS: Sensors, Diodes, Thermography, Luminescence, Infrared radiation, Temperature metrology, Light emitting diodes, Imaging systems, Resistance, Solar concentrators

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Proceedings Article | 1 March 1991 Paper

Multilayer InSb diodes grown by molecular beam epitaxy for near-ambient temperature operation

Tim Ashley, A. Dean, Charles Elliott, M. Houlton, C. McConville, Howard Tarry, Colin Whitehouse

Proceedings Volume 1361, (1991) https://doi.org/10.1117/12.24426

KEYWORDS: Diodes, Molecular beam epitaxy, Silicon, Doping, Optoelectronic devices, Infrared radiation, Resistance, Infrared detection, Beryllium, Indium

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Showing 5 of 23 publications

Conference Committee Involvement (3)

Infrared Technology and Applications XXXVII

25 April 2011 | Orlando, Florida, United States

Infrared Technology and Applications XXXVI

5 April 2010 | Orlando, Florida, United States

Infrared Photoelectronics

30 August 2005 | Warsaw, Poland

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