Dr. Gilbert W. Smith Profile

Dr. Gilbert W. Smith

Finance Director at Malvern Optical Ltd

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Author

Publications (16)

Proceedings Article | 28 August 2010 Paper

A 2x2 multi-chip reconfigurable MOEMS mask: a stepping stone to large format microshutter arrays for coded aperture applications

Mark McNie, Alan Brown, David King, Gilbert Smith, Neil Gordon, Stephen Riches, Stanley Rogers

Proceedings Volume 7818, 78180G (2010) https://doi.org/10.1117/12.860436

KEYWORDS: Microopto electromechanical systems, Imaging systems, Mid-IR, Mirrors, Coded aperture imaging, Photomasks, Sensors, Modulation, Modulators, Coded apertures

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Proceedings Article | 25 September 2009 Paper

Retro-reflective communications over a kilometre range using a MEMS-based optical tag

Andrew Scott, Kevin Ridley, David Jones, Mark McNie, Gilbert Smith, Kevin Brunson, Andrew Lewin, Keith Lewis

Proceedings Volume 7480, 74800L (2009) https://doi.org/10.1117/12.835073

KEYWORDS: Modulators, Modulation, Micromirrors, Sensors, Logic, Silicon, Telecommunications, Fabry–Perot interferometers, Microelectromechanical systems, Signal detection

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Proceedings Article | 25 August 2009 Paper

A scalable multi-chip architecture to realise large-format microshutter arrays for coded aperture applications

Mark McNie, David King, Gilbert Smith, Steven Stone, Alan Brown, Neil Gordon, Christopher Slinger, Kevin Cannon, Stephen Riches, Stanley Rogers

Proceedings Volume 7468, 74680E (2009) https://doi.org/10.1117/12.829105

KEYWORDS: Microopto electromechanical systems, Mirrors, Mid-IR, Imaging systems, Silicon, Fabry–Perot interferometers, Coded aperture imaging, Microelectromechanical systems, Coded apertures, Semiconducting wafers

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Proceedings Article | 19 February 2009 Paper

Large area transmissive modulator for a remotely interrogated MEMS-based optical tag

Mark McNie, Andrew Scott, Nicola Price, David Combes, Gilbert Smith, Kevin Ridley, Kevin Brunson, David Jones, Keith Lewis

Proceedings Volume 7208, 720806 (2009) https://doi.org/10.1117/12.809199

KEYWORDS: Modulators, Mirrors, Retroreflectors, Silicon, Modulation, Microopto electromechanical systems, Switching, Fabry–Perot interferometers, Surface micromachining, Microelectromechanical systems

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Proceedings Article | 19 August 2008 Paper

A large area reconfigurable MOEMS microshutter array for coded aperture imaging systems

Mark McNie, David King, Nicola Price, David Combes, Gilbert Smith, Alan Brown, Neil Gordon, Steven Stone, Kevin Brunson, Keith Lewis, Christopher Slinger, Stanley Rogers

Proceedings Volume 7096, 70960D (2008) https://doi.org/10.1117/12.794996

KEYWORDS: Microopto electromechanical systems, Mirrors, Imaging systems, Mid-IR, Coded aperture imaging, Electrodes, Fabry–Perot interferometers, Control systems, Silicon, Image resolution

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Proceedings Article | 26 September 2007 Paper

Reconfigurable mask for adaptive coded aperture imaging (ACAI) based on an addressable MOEMS microshutter array

Mark McNie, David Combes, Gilbert Smith, Nicola Price, Kevin Ridley, Keith Lewis, Chris Slinger, Stanley Rogers

Proceedings Volume 6714, 67140B (2007) https://doi.org/10.1117/12.735894

KEYWORDS: Mirrors, Microopto electromechanical systems, Coded aperture imaging, Mid-IR, Switching, Electrodes, Modulators, Imaging systems, Silicon, Fabry–Perot interferometers

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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 | 8 December 2004 Paper

Micromachined modulator arrays for use in free-space optical communication systems

Keith Lewis, Kevin Ridley, Mark McNie, Gilbert Smith, Andrew Scott

Proceedings Volume 5614, (2004) https://doi.org/10.1117/12.578552

KEYWORDS: Modulators, Silicon, Modulation, Microopto electromechanical systems, Mirrors, Free space optical communications, Telecommunications, Fabry–Perot interferometers, Free space optics, Quantum wells

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Proceedings Article | 30 November 2004 Paper

Integrated micromachined filters for wavelength division multiplexing

Keith Lewis, Gilbert Smith, Mark McNie

Proceedings Volume 5618, (2004) https://doi.org/10.1117/12.578554

KEYWORDS: Silicon, Etching, Photomasks, Optical filters, Wavelength division multiplexing, Mirrors, Electronic filtering, Tunable filters, Refractive index, Reflectivity

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Proceedings Article | 30 May 2003 Paper

Nodular defects in sputtered coatings

Keith Lewis, Gilbert Smith, Alan Pidduck

Proceedings Volume 4932, (2003) https://doi.org/10.1117/12.472405

KEYWORDS: Sputter deposition, Silicon, Ion beams, Optical coatings, Dense wavelength division multiplexing, Optical parametric oscillators, Plasma, Silicon films, Optical filters, Ions

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Proceedings Article | 9 April 2002 Paper

Design issues for tunable filters for optical telecommunications

Keith Lewis, Gilbert Smith, Ian Mason, Katie Rochester

Proceedings Volume 4679, (2002) https://doi.org/10.1117/12.461728

KEYWORDS: Electro optics, Tunable filters, Refractive index, Liquid crystals, Optical filters, Telecommunications, Polymers, Dielectrics, Thermal optics, Temperature metrology

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Proceedings Article | 13 November 2000 Paper

Nanodispersed liquid crystal polymer composites for optically tunable filters

Keith Lewis, Ian Mason, Ian Sage, K. Lymer, Gilbert Smith

Proceedings Volume 4104, (2000) https://doi.org/10.1117/12.406475

KEYWORDS: Liquid crystals, Refractive index, Polymers, Composites, Tunable filters, Mirrors, Electro optics, Optical filters, Molecules, Fabry–Perot interferometers

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Proceedings Article | 11 December 1998 Paper

X-ray optics of in-situ synchrotron topography studies of the early stages of relaxation in epitaxial InGaAs on GaAs

Brian Tanner, Andrew Keir, Peter Moeck, Colin Whitehouse, Gareth Lacey, Andrew Johnson, Gilbert Smith, Graham Clark

Proceedings Volume 3448, (1998) https://doi.org/10.1117/12.332496

KEYWORDS: Reflection, Crystals, Silicon, Laser crystals, Gallium arsenide, Phase contrast, Indium gallium arsenide, Diffraction, Synchrotron radiation, Distortion

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Proceedings Article | 4 May 1998 Paper

Intrinsically matched 50-ohm laser arrays with greater than 100% quantum efficiencies for optically coupled transistors and low-loss fiber optic links

Stephen Ayling, David Wight, Michael Allenson, Keith Hilton, Gilbert Smith

Proceedings Volume 3285, (1998) https://doi.org/10.1117/12.307608

KEYWORDS: Transistors, Photodiodes, Fiber optics, Quantum efficiency, Resistors, Resistance, Laser damage threshold, Semiconductor lasers, External quantum efficiency, Phased array optics

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Proceedings Article | 12 January 1998 Paper

16-channel (1- to 16-GHz) microwave spectrum analyzer device based on a phased array of GaAs/AlGaAs electro-optic waveguide delay lines

John Heaton, Chris Watson, Sylvia Jones, Michelle Bourke, Colin Boyne, Gilbert Smith, David Wight

Proceedings Volume 3278, (1998) https://doi.org/10.1117/12.298207

KEYWORDS: Waveguides, Spectrum analysis, Diffraction, Electro optics, Phased arrays, Modulators, Phased array optics, Cladding, Microscopes, Electrodes

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Proceedings Article | 19 June 1995 Paper

Optoelectronic nanostructures: physics and technology

Heinz Schweizer, Uwe Griesinger, Volker Haerle, Frank Adler, Manfred Burkard, Frank Barth, Juergen Hommel, Christiane Kaden, Janos Kovac, Justus Kuhn, Bernd Klepser, Georg Lehr, Freek Prins, Ferdinand Scholz, Manfred Pilkuhn, Josef Straka, Alfred Forchel, Gilbert Smith

Proceedings Volume 2399, (1995) https://doi.org/10.1117/12.212517

KEYWORDS: Laser damage threshold, Etching, Photomasks, Nanostructures, Semiconductors, Laser resonators, Quantum efficiency, Resonators, Ions, Dry etching

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Nanostructures based on III-V semiconductor materials have reached a status which enables basic physical studies on size effects in device and in nanostructures. The expected benefits of high modulation bandwidth, low laser threshold, and improved linewidth enhancement factor in DFB lasers, to say only a few, which are believed to be based mainly on the changed density of states (DOS) function in low dimensions might be counterbalanced by altered carrier energy relaxation and k-space filling in those structures. To investigate systematically size effects and device aspects, a continuous change of structure and active device size is needed from 2D to 0D dimensions. This requirement can be met by high resolution electron beam lithography in conjunction with low damage etch processes and epitaxial overgrowth. In this presentation we discuss the technology and design considerations of lasers with low dimensional active regions as well as DOS effects and device relevant carrier relaxation effects. The technology part will focus especially on low damage etch processes such as RIE- ECR. Nearly damage free structuring processes can be demonstrated. Based on this low damage dry etch process we obtained electrically pumped wire DFB lasers with relatively high output power (up to 6 mW) and operation temperature (60 degrees C). Time resolved optical ps-spectroscopy as well as high excitation spectroscopy on wire and dot nanostructures demonstrate strongly changed k-space filling and carrier relaxation mechanisms in low dimensions and represent a serious limitation of device speed. Results obtained from electrically pumped wire DFB lasers confirm the carrier relaxation and k-space filling effects in device structures which have been observed by optical pump experiments in nanostructures. Despite the band filling effects in low dimensional structures, the wire DFB lasers show clearly the expected feature of gain coupling and enhanced differential gain which might demonstrate the applicability of mesoscopic laser devices in common data communication approaches.

Showing 5 of 16 publications

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