Dr. Alan D. Scott Profile

Dr. Alan D. Scott

Engineering Fellow at Honeywell Aerospace

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Author

Publications (38)

Proceedings Article | 11 November 2020

The QEYSSAT mission: on-orbit demonstration of secure optical communications network technologies (Erratum)

A. Scott, T. Jennewein, J. Cain, I. D'Souza, B. Higgins, D. Hudson, H. Podmore, W. Soh

Proc. SPIE. 11532, Environmental Effects on Light Propagation and Adaptive Systems III

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Proceedings Article | 20 September 2020 Presentation + Paper

The QEYSSAT mission: on-orbit demonstration of secure optical communications network technologies

A. Scott, T. Jennewein, J. Cain, I. D'Souza, B. Higgins, D. Hudson, H. Podmore, W. Soh

Proc. SPIE. 11532, Environmental Effects on Light Propagation and Adaptive Systems III

KEYWORDS: Defense and security, Safety, Free space, Collimation, Optical communications, Optical tracking, Free space optics, Optical networks, Quantum key distribution, Network security

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SPIE Journal Paper | 18 March 2020

Quantum yield estimation for an electron-multiplying charge-coupled device from photon counting test data

Robert Gleisinger, Neil Rowlands, Alan Scott, Olivier Daigle

JATIS Vol. 6 Issue 01

KEYWORDS: Quantum efficiency, Electrons, Silicon, Charge-coupled devices, Ultraviolet radiation, Sensors, Electron multiplying charge coupled devices, Reflectivity, Photon counting, Crystals

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Proceedings Article | 20 July 2018 Paper

Ultraviolet sensitivity of a teledyne-e2v EMCCD

Neil Rowlands, Ken Smith, Olivier Daigle, Oleg Djazovski, Alan Scott, Alexander Beaton, Andrew Wilson

Proc. SPIE. 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII

KEYWORDS: Visible radiation, Sensors, Ultraviolet radiation, Photons, Silicon, Quantum efficiency, Photodiodes, Electron multiplying charge coupled devices

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Electron multiplying charged coupled devices (EMCCD’s) can provide significantly greater signal to noise ratios in low light conditions and/or for higher speed readout than traditional CCDs. Due to the electron multiplication before readout, the effective readout noise can be at the sub-electron level, enabling single photon counting. Traditional far UV (150 – 200 nm) imaging detectors have utilized micro-channel plates to detect usually scarce UV photons at low efficiency, amplify them into electron showers which strike a phosphor, allowing a silicon detector array to perform the final detection of the resulting visible light pulse. The typical efficiencies of UV photo detection with MCP systems ranges from a low of a few percent to as high as 25%. Given that the theoretical probability of absorption of UV photons in silicon is at least 30% in this wavelength range, then it should be possible to make use of a photon counting EMCCD to directly detect UV photons that is competitive with MCP performance. We approached Teledyne-e2v and they confirmed that a backside thinned EMCCD with their ‘astro no-coat’ process should provide reasonable quantum efficiency (ie. > 30%) in this range. The primary application in which we are interested is UV imaging of the aurora from space-based platforms. In this application there are system level advantages to replacing an MCP based detector with an EMCCD which is directly sensitive to UV illumination, namely the elimination of a high voltage power supply and higher spatial resolution. An MCP produces an electron shower which degrades image quality and also requires a relatively thick detector window which has to be accommodated in the imager optical design. We acquired five CCD201 engineering model EMCCDs with e2v’s ‘astro no-coat’ process, and incorporated one of these into a standard flexible liquid nitrogen cooled EMCCD camera produced by Nüvü Camēras. Once installed the EMCCD operation was confirmed with standard Nüvü Camēras test procedures. The camera was then mounted in a test vacuum chamber along with a McPherson UV monochromator so that the UV performance could be assessed. A NIST traceable photodiode was used for the absolute calibration. The resulting intrinsic QE was found to be 34% at 180 nm rising to 44% at 150 nm. The quantum yield was found to be quite low, only a few percent at 180 nm rising to only 1.13-1.18 at 150 nm. This is considerably lower than comparable results from CCDs where delta-doping has been used to improve the responsive quantum efficiency and also lower than a Teledyne-e2v CMOS sensor with the same surface treatment.

Proceedings Article | 17 May 2018 Paper

Spectral retrieval techniques for high-resolution Fourier-transform micro-spectrometers

Alaine Herrero-Bermello, Aitor Velasco, Hugh Podmore, Pavel Cheben, Jens Schmid, Siegfried Janz, María Calvo, Dan-Xia Xu, Alan Scott, Regina Lee

Proc. SPIE. 10683, Fiber Lasers and Glass Photonics: Materials through Applications

KEYWORDS: Waveguides, Interferometers, Calibration, Spectrometers, Silicon, Fourier transforms, Heterodyning, Spectral resolution, Transmittance

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Proceedings Article | 22 February 2018 Presentation + Paper

A compressive-sensing Fourier-transform on-chip Raman spectrometer

Hugh Podmore, Alan Scott, Regina Lee

Proc. SPIE. 10539, Photonic Instrumentation Engineering V

KEYWORDS: Microlens array, Waveguides, Calibration, Spectroscopy, Fourier transforms, Raman spectroscopy, Micromirrors, Integrated optics, Planar waveguides, Compressed sensing, Fourier-transform interferometers

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Proceedings Article | 29 August 2017 Paper

Simulation and optimization of the SWIFT stratospheric wind interferometer for transport studies on GCOM-A1

Alan Scott

Proc. SPIE. 10313, Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging

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Proceedings Article | 5 August 2016 Paper

The effect of proton radiation on the EMCCD for a low Earth orbit satellite mission

Ken Smith, Olivier Daigle, Alan Scott, Louis Piche, Danya Hudson

Proc. SPIE. 9915, High Energy, Optical, and Infrared Detectors for Astronomy VII

KEYWORDS: Telescopes, Clocks, Clocks, Stars, Cameras, Satellites, Space telescopes, Electron multiplying charge coupled devices, Charge-coupled devices, Radiation effects, Lead

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Proceedings Article | 27 July 2016 Paper

NUV performance of e2v large BICMOS array for CASTOR

Alan Scott, Alexander Beaton, Niladri Roy, Patrick Côté, John Hutchings

Proc. SPIE. 9915, High Energy, Optical, and Infrared Detectors for Astronomy VII

KEYWORDS: Stars, Sensors, Calibration, Video, Ultraviolet radiation, Silicon, Quantum efficiency, Photodiodes, Promethium, Large Synoptic Survey Telescope

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Proceedings Article | 24 July 2014 Paper

Update on the CASTOR mission concept: scientific opportunities in the Euclid and WFIRST era

Patrick Côté, Alan Scott

Proc. SPIE. 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray

KEYWORDS: Staring arrays, Telescopes, Mirrors, Astronomy, Sensors, Ultraviolet radiation, Image quality, Space telescopes, Spatial resolution, Large Synoptic Survey Telescope

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Proceedings Article | 23 July 2014 Paper

Candidate detector assessment for the CASTOR mission

Alan Scott, Patrick Cote, Neil Rowlands, Olivier Daigle

Proc. SPIE. 9154, High Energy, Optical, and Infrared Detectors for Astronomy VI

KEYWORDS: Staring arrays, Sensors, Ultraviolet radiation, Photons, Silicon, Quantum efficiency, Electron multiplying charge coupled devices, Charge-coupled devices, Silicon carbide, Back illuminated sensors

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Proceedings Article | 17 October 2013 Paper

A static birefringent interferometer for the measurement of upper atmospheric winds

Jeffery Langille, William Ward, William Gault, Alan Scott, Driss Touahri, Andrew Bell

Proc. SPIE. 8890, Remote Sensing of Clouds and the Atmosphere XVIII; and Optics in Atmospheric Propagation and Adaptive Systems XVI

KEYWORDS: Signal to noise ratio, Doppler effect, Interferometers, Calibration, Crystals, Wave plates, Charge-coupled devices, Wind measurement, Prototyping, Visibility

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Proceedings Article | 21 September 2012 Paper

Space environment challenges with the tunable Fabry-Perot etalon for the JWST fine guidance sensor

Craig Haley, Niladri Roy, Zeljko Osman, Neil Rowlands, Alan Scott

Proc. SPIE. 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave

KEYWORDS: Fabry–Perot interferometers, Ferroelectric materials, Sensors, Silicon, Control systems, Space telescopes, James Webb Space Telescope, Cryogenics, Prototyping, Electrochemical etching

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Proceedings Article | 21 September 2012 Paper

CASTOR: the Cosmological Advanced Survey Telescope for Optical and Ultraviolet Research

Patrick Côte, Alan Scott, Michael Balogh, Ron Buckingham, David Aldridge, Ray Carlberg, Weiguo Chen, Jean Dupuis, Clinton Evans, Laurent Drissen, Wes Fraser, Frederic Grandmont, Paul Harrison, John Hutchings, JJ Kavelaars, John-Thomas Landry, Christian Lange, Denis Laurin, Tarun Patel, Venka Pillay, Louis Piche, Andres Rader, Carmelle Robert, Marchin Sawicki, Robert Sorba, Guillaume Theriault, Ludovic Van Waerbeke

Proc. SPIE. 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave

KEYWORDS: Staring arrays, Telescopes, Mirrors, Sensors, Ultraviolet radiation, Space telescopes, Space operations, Galactic astronomy, Ultraviolet telescopes, Large Synoptic Survey Telescope

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Proceedings Article | 18 February 2011 Paper

Improved coupling to integrated spatial heterodyne spectrometers with applications to space

A. Scott, P. Bock, C. Ramos, B. Lamontagne, P. Cheben, M. Florjańczyk, I. Fernandez, S. Janz, A. Ortega-Monux, B. Solheim, D.-X. Xu

Proc. SPIE. 7928, Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS and Nanodevices X

KEYWORDS: Finite-difference time-domain method, Waveguides, Sensors, Etching, Remote sensing, Spectrometers, Fourier transforms, Heterodyning, Spectral resolution, Waveguide modes

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Proceedings Article | 28 August 2010 Paper

Tunable filter imager for JWST: etalon opto-mechanical design and test results

D. Touahri, P. Cameron, C. Evans, C. Haley, Z. Osman, A. Scott, N. Rowlands

Proc. SPIE. 7808, Infrared Remote Sensing and Instrumentation XVIII

KEYWORDS: Infrared imaging, Fabry–Perot interferometers, Ferroelectric materials, Imaging systems, Sensors, Coating, Infrared radiation, Tunable filters, James Webb Space Telescope, Cryogenics

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Proceedings Article | 11 August 2010 Paper

Speckle differential imagery performance using a JWST tunable filter etalon prototype

P. Ingraham, R. Doyon, M. Beaulieu, N. Rowlands, A. Scott

Proc. SPIE. 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave

KEYWORDS: Point spread functions, Fabry–Perot interferometers, Speckle, Sensors, Calibration, Capacitance, Space telescopes, Tunable filters, James Webb Space Telescope, Prototyping

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Proceedings Article | 11 August 2010 Paper

Characterization of the tunable filter imager etalon on the JWST Fine Guidance Sensor

Craig Haley, Clinton Evans, Eric Grant, Rodney Norman, Zeljko Osman, Neil Rowlands, Niladry Roy, Alan Scott, Driss Touahri

Proc. SPIE. 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave

KEYWORDS: Fabry–Perot interferometers, Electronics, Ferroelectric materials, Imaging systems, Sensors, Reflectivity, Control systems, Tunable filters, James Webb Space Telescope, Electrochemical etching

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Proceedings Article | 5 August 2010 Paper

The JWST tunable filter imager (TFI)

R. Doyon, J. Hutchings, N. Rowlands, C. Evans, E. Greenberg, C. Haley, A. Scott, D. Touahri, M. Beaulieu, D. Lafrenière, R. Abraham, E. Barton, P. Chayer, L. Ferrarese, A. Fullerton, R. Jayawardhana, D. Johnstone, A. Martel, A. W. M. R. Meyer, J. Pipher, K. Saad, M. Sawicki, A. Sivaramakrishnan, K. Volk

Proc. SPIE. 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave

KEYWORDS: Fabry–Perot interferometers, Imaging systems, Sensors, Coating, Coronagraphy, Exoplanets, Space telescopes, Spectral resolution, Tunable filters, James Webb Space Telescope

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Proceedings Article | 18 February 2010 Paper

Development of a slab waveguide spatial heterodyne spectrometer for remote sensing

Miroslaw Florjańczyk, Pavel Cheben, Siegfried Janz, Boris Lamontagne, Jean Lapointe, Alan Scott, Brian Solheim, Dan-Xia Xu

Proc. SPIE. 7594, MOEMS and Miniaturized Systems IX

KEYWORDS: Optical filters, Mach-Zehnder interferometers, Waveguides, Sensors, Calibration, Spectroscopy, Silicon, Fourier transforms, Detector arrays, Heterodyning

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Proceedings Article | 18 May 2009 Paper

Slab waveguide spatial heterodyne spectrometers for remote sensing from space

Miroslaw Florjanczyk, Pavel Cheben, Siegfried Janz, Boris Lamontagne, Jean Lapointe, Alan Scott, Brian Solheim, Dan-Xia Xu

Proc. SPIE. 7356, Optical Sensors 2009

KEYWORDS: Waveguides, Interferometers, Calibration, Remote sensing, Spectrometers, Silicon, Fourier transforms, Wavefronts, Heterodyning, Spectral resolution

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Proceedings Article | 24 February 2009 Paper

Micro-interferometer with high throughput for remote sensing

Alan Scott, Mirosław Florjańczyk, Pavel Cheben, Siegfried Janz, Brian Solheim, Dan-Xia Xu

Proc. SPIE. 7208, MOEMS and Miniaturized Systems VIII

KEYWORDS: Signal to noise ratio, Waveguides, Sensors, Calibration, Spectroscopy, Remote sensing, Silicon, Fourier transforms, Detector arrays, Spectral resolution

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Proceedings Article | 10 February 2009 Paper

Multi-aperture Fourier spectrometers in planar waveguides

Miroslaw Florjanczyk, Pavel Cheben, Siegfried Janz, Boris Lamontagne, Jean Lapointe, Alan Scott, Kenneth Sinclair, Brian Solheim, Dan-Xia Xu

Proc. SPIE. 7218, Integrated Optics: Devices, Materials, and Technologies XIII

KEYWORDS: Apodization, Mach-Zehnder interferometers, Fabry–Perot interferometry, Waveguides, Interferometers, Spectrometers, Silicon, Heterodyning, Spectral resolution, Planar waveguides

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Proceedings Article | 29 August 2008 Paper

Design and fabrication of large spectral waveband mirror coatings for scanning Fabry-Perot etalons

Clinton Evans, Michel Poirier, Alan Scott, Driss Touahri, Samir Ilias, Rene Doyon

Proc. SPIE. 7067, Advances in Thin-Film Coatings for Optical Applications V

KEYWORDS: Amorphous silicon, Refractive index, Mirrors, Fabry–Perot interferometers, Data modeling, Silica, Sensors, Silicon, Reflectivity, Spectral resolution

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Proceedings Article | 12 August 2008 Paper

Spatial heterodyne planar waveguide spectrometer: theory and design

Miroslaw Florjanczyk, Pavel Cheben, Siegfried Janz, Alan Scott, Brian Solheim, Dan-Xia Xu

Proc. SPIE. 7099, Photonics North 2008

KEYWORDS: Mach-Zehnder interferometers, Waveguides, Calibration, Spectroscopy, Error analysis, Fourier transforms, Heterodyning, Bismuth, Planar waveguides, Spectrometer engineering

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Proceedings Article | 12 July 2008 Paper

JWST tunable filter imager: etalon prototype test results

D. Touahri, P. Cameron, C. Evans, E. Greenberg, N. Rowlands, A. Scott, R. Doyon, M. Beaulieu, O. Djazovski

Proc. SPIE. 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter

KEYWORDS: Fabry–Perot interferometers, Ferroelectric materials, Imaging systems, Sensors, Spectroscopy, Coating, Tunable filters, James Webb Space Telescope, Cryogenics, Prototyping

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Proceedings Article | 12 July 2008 Paper

The JWST tunable filter imager (TFI)

R. Doyon, N. Rowlands, J. Hutchings, C. Evans, E. Greenberg, A. Scott, D. Touhari, M. Beaulieu, R. Abraham, L. Ferrarese, A. Fullerton, R. Jayawardhana, D. Johnston, M. R. Meyer, J. Pipher, M. Sawicki

Proc. SPIE. 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter

KEYWORDS: Mirrors, Fabry–Perot interferometers, Imaging systems, Sensors, Coating, Reflectivity, Coronagraphy, Exoplanets, Tunable filters, James Webb Space Telescope

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Proceedings Article | 9 July 2008 Paper

Optical-mechanical operation of the F2T2 filter: a tunable filter designed to search for First Light

Erin Mentuch, Alan Scott, Roberto Abraham, Elizabeth Barton, Matthew Bershady, Joss Bland-Hawthorn, David Crampton, René Doyon, Steve Eikenberry, Mike Gladders, Karl Glazebrook, Joe Jenson, Jeff Julian, Roger Julian, Jean-Paul Kneib, David Loop, Nick Raines, Neil Rowlands, J. D. Smith

Proc. SPIE. 7014, Ground-based and Airborne Instrumentation for Astronomy II

KEYWORDS: Observatories, Optical filters, Fabry–Perot interferometers, Gemini Observatory, Calibration, Spectroscopy, Image filtering, Tunable filters, Galactic astronomy, James Webb Space Telescope

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Proceedings Article | 30 October 2007 Paper

Planar waveguide spatial heterodyne spectrometer

Mirosław Florjańczyk, Pavel Cheben, Siegfried Janz, Alan Scott, Brian Solheim, Dan-Xia Xu

Proc. SPIE. 6796, Photonics North 2007

KEYWORDS: Apodization, Waveguides, Polarization, Birefringence, Interferometers, Glasses, Spectroscopy, Heterodyning, Planar waveguides, Absorption

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Proceedings Article | 26 October 2007 Paper

Spatial heterodyne spectrometer for FLEX

Alan Scott, Sheng-Hai Zheng, Stephen Brown, Andrew Bell

Proc. SPIE. 6744, Sensors, Systems, and Next-Generation Satellites XI

KEYWORDS: Signal to noise ratio, Optical design, Imaging systems, Sensors, Satellites, Spectroscopy, Distortion, Heterodyning, Spectral resolution, Spatial resolution

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Proceedings Article | 27 June 2006 Paper

Performance of F2T2 tandem tunable etalon

Alan Scott, Maniyar Javed, Roberto Abraham, Steve Eikenberry, Elizabeth Barton, Matthew Bershady, Joss Bland-Hawthorn, David Crampton, Rene Doyon, Jeff Julian, Roger Julian, Jean-Paul Kneib, David Loop, Nick Raines, Neil Rowlands, J. Smith

Proc. SPIE. 6269, Ground-based and Airborne Instrumentation for Astronomy

KEYWORDS: Telescopes, Fabry–Perot interferometers, Electronics, Digital signal processing, Gemini Observatory, Calibration, Control systems, Space telescopes, Spectral resolution, Device simulation

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Proceedings Article | 30 December 2004 Paper

Miniature spectrometers for planetary remote sensing

Alan Scott, Neil Rowlands, Andrew Bell

Proc. SPIE. 5660, Instruments, Science, and Methods for Geospace and Planetary Remote Sensing

KEYWORDS: Mirrors, Prisms, Fabry–Perot interferometers, Waveguides, Sensors, Remote sensing, Spectrometers, Fourier transforms, Heterodyning, Spectral resolution

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Proceedings Article | 12 October 2004 Paper

Tunable filters for JWST Fine Guidance Sensor

Neil Rowlands, Clinton Evans, Elliot Greenberg, Phil Gregory, Alan Scott, Simon Thibault, Michel Poirier, Rene Doyon, John Hutchings, Russ Alexander

Proc. SPIE. 5487, Optical, Infrared, and Millimeter Space Telescopes

KEYWORDS: Actuators, Fabry–Perot interferometers, Ferroelectric materials, Coating, Reflectivity, Transmittance, Tunable filters, Galactic astronomy, James Webb Space Telescope, Prototyping

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Proceedings Article | 30 September 2004 Paper

Tunable etalons and other applications of multi-application low-voltage piezoelectric instrument control electronics (MALICE)

Alan Scott, Rodney Norman, Liping Zhou

Proc. SPIE. 5492, Ground-based Instrumentation for Astronomy

KEYWORDS: Fabry–Perot interferometers, Electronics, Ferroelectric materials, Sensors, Calibration, Control systems, Tunable filters, Ozone, James Webb Space Telescope, Prototyping

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Proceedings Article | 2 February 2004 Paper

Data retrieval and error analysis study on the measurement of stratospheric winds with a Michelson interferometer

Yves Rochon, Peyman Rahnama, Ian McDade, Alan Scott, William Gault, Jennifer Lukovich

Proc. SPIE. 5234, Sensors, Systems, and Next-Generation Satellites VII

KEYWORDS: Doppler effect, Calibration, Transmittance, Chemical elements, Ozone, Atmospheric modeling, Wind measurement, Visibility, Nitrous oxide, Michelson interferometers

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Proceedings Article | 8 April 2003 Paper

Filters and calibration for the SWIFT instrument on GCOM-A1

William Gault, Ian McDade, Yves Rochon, Alan Scott

Proc. SPIE. 4881, Sensors, Systems, and Next-Generation Satellites VI

KEYWORDS: Telescopes, Mirrors, Fabry–Perot interferometers, Interferometers, Sensors, Calibration, Germanium, Space telescopes, Black bodies, Temperature metrology

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Proceedings Article | 12 December 2001 Paper

SWIFT: an infrared Doppler Michelson interferometer for measuring stratospheric winds

William Gault, Ian McDade, Gordon Shepherd, Reza Mani, Stephen Brown, Phil Gregory, Alan Scott, Yves Rochon, Wayne Evans

Proc. SPIE. 4540, Sensors, Systems, and Next-Generation Satellites V

KEYWORDS: Mid-IR, Fabry–Perot interferometers, Doppler effect, Calibration, Satellites, Germanium, Infrared radiation, Semiconducting wafers, Wind measurement, Michelson interferometers

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Proceedings Article | 21 February 2001 Paper

SWIFT instrument

Alan Scott, B. Mackay, Shiguang Wang, Neil Rowlands, G. Shepherd, W. Gault, Ian McDade, Yves Rochon

Proc. SPIE. 4150, Optical Remote Sensing of the Atmosphere and Clouds II

KEYWORDS: Optical filters, Fabry–Perot interferometers, Electronics, Doppler effect, Sensors, Satellites, Ozone, Stratosphere, Atmospheric modeling, Wind measurement

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Showing 5 of 38 publications

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