Dr. James F. Christian Profile

Dr. James F. Christian

Chief Scientist, Semiconductors & Magnetic Sensors at Radiation Monitoring Devices Inc

SPIE Involvement:

Author

Publications (41)

Proceedings Article | 4 October 2022 Presentation + Paper

Improved performance and longevity of large volume thallium bromide devices

H. Kim, L. Cirignano, J. F. Christian, A. Kargar, Y. Ogorodnik, S. Kim, M. Breen, M. R. Squillante, K. Shah

Proceedings Volume 12241, 1224106 (2022) https://doi.org/10.1117/12.2635925

KEYWORDS: Sensors, Cesium, Thallium, Semiconductors, Gamma radiation, Spectroscopy, Signal detection, Sensor performance, Amplifiers, Signal generators

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Proceedings Article | 4 October 2022 Presentation + Paper

Thermal neutron detection with lithium-based semiconductors

Alireza Kargar, Huicong Hong, Joshua Tower, Paul Guggenheim, Eric Qian, Conner Brown, Mathew Breen, James Christian, Kanai Shah, Eric Lukosi, Robert Golduber, Jake Gallagher, Amine Benkechkache, Mercouri Kanatzidis, Michael Squillante

Proceedings Volume 12241, 1224108 (2022) https://doi.org/10.1117/12.2632318

KEYWORDS: Sensors, Crystals, Lithium, Semiconductors, Transmittance, Gold, Gamma radiation, Selenium, Electrons, Semiconducting wafers

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Proceedings Article | 3 October 2022 Presentation

Performance characterizations of position-sensitive virtual Frisch-grid TlBr detectors (Conference Presentation)

Aleksey Bolotnikov, Conner Brown, Gabriella Carini, James Christian, Leonard Cirignano, Connie-Rose Deane, Alfred Dellapenna, Grzegorz Deptuch, Jack Fried, Sven Herrmann, Hadong Kim, Giovanni Pinaroli, Alireza Kargar, Martin Koslowsky, Piotr Maj, Victor Manthena, Alexander Miller, Sandeep Miriala, Eric Raguzina, Kanai Shah, Michael Squillante, Martin Smith, Andrew Valente, Evan Weststrate

Proceedings Volume PC12241, PC122410D (2022) https://doi.org/10.1117/12.2635899

KEYWORDS: Sensors, Crystals, Semiconductors, Semiconductor materials, Ions, Gamma radiation, Electric field sensors

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SPIE Journal Paper | 14 December 2017 Open Access

Compact dual-mode diffuse optical system for blood perfusion monitoring in a porcine model of microvascular tissue flaps

Seung Yup Lee, Julia Pakela, Michael Helton, Karthik Vishwanath, Yooree Chung, Noah Kolodziejski, Christopher Stapels, Daniel McAdams, Daniel Fernandez, James Christian, Jameson O'Reilly, Dana Farkas, Brent Ward, Stephen Feinberg, Mary-Ann Mycek

JBO, Vol. 22, Issue 12, 121609, (December 2017) https://doi.org/10.1117/12.10.1117/1.JBO.22.12.121609

KEYWORDS: Optical fibers, Skin, Arteries, Tissue optics, Blood, Blood circulation, Tissues, Surgery, Diffuse reflectance spectroscopy, Reflectivity

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Proceedings Article | 7 September 2017 Presentation + Paper

Neutron detection with plastic scintillators coupled to solid state photomultiplier detectors

James Christian, Erik Johnson, Daniel Fernandez, Samuel Vogel, Rebecca Frank, Graham Stoddard, Christopher Stapels, Jorge Pereira, Remco Zegers

Proceedings Volume 10393, 1039307 (2017) https://doi.org/10.1117/12.2276991

KEYWORDS: Sensors, Scintillation, Signal processing, Detector development, Magnetism, Signal detection, Sensor performance, Gamma radiation, Liquids, Scintillators

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Proceedings Article | 29 August 2017 Presentation + Paper

Conceptual design of the SMART dosimeter

Erik Johnson, Sam Vogel, Rebecca Frank, Graham Stoddard, Alonzo Vera, David Alexander, James Christian

Proceedings Volume 10397, 103970T (2017) https://doi.org/10.1117/12.2276283

KEYWORDS: Particles, Space operations, Sensors, Algorithm development, Scintillators, Silicon photomultipliers, Satellite communications, Satellites, Scintillation, Ions

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Proceedings Article | 24 August 2017 Presentation + Paper

Development of the LunaH-Map miniature neutron spectrometer

Erik Johnson, Craig Hardgrove, Richard Starr, Sam Vogel, Rebecca Frank, Graham Stoddard, Stephen West, James Christian

Proceedings Volume 10392, 103920H (2017) https://doi.org/10.1117/12.2276273

KEYWORDS: Hydrogen, Spectroscopy, Sensors, Digital signal processing, Detector development, Electronics

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Proceedings Article | 14 March 2017 Paper

A capillary-mimicking optical tissue phantom for diffuse correlation spectroscopy

Jameson O'Reilly, Noah Kolodziejski, Daniel McAdams, Dan Fernandez, Christopher Stapels, James Christian

Proceedings Volume 10056, 1005613 (2017) https://doi.org/10.1117/12.2252498

KEYWORDS: Tissue optics, Capillaries, Spectroscopes, Biomedical optics, 3D printing, Diagnostics, Field spectroscopy, Tissues, Numerical simulations, Optical tomography, Arteries, Liquids, Switches, Spectroscopy

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Proceedings Article | 17 February 2017 Paper

Design verification of a compact system for detecting tissue perfusion using bimodal diffuse optical technologies

Julia Pakela, Taylor Hedrick, Seung Yup Lee, Karthik Vishwanath, Sara Zanfardino, Yooree Chung, Michael Helton, Noah Kolodziejski, Christopher Stapels, Daniel McAdams, Daniel Fernandez, James Christian, Stephen Feinberg, Mary-Ann Mycek

Proceedings Volume 10072, 1007217 (2017) https://doi.org/10.1117/12.2252811

KEYWORDS: Tissue optics, Diffuse reflectance spectroscopy, Reflectance spectroscopy, Tissues, Liquids, Biomedical optics, Spectroscopy, Optical properties, Fiber optics, Blood circulation, Data analysis, Reflectivity, In vivo imaging, Scattering

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Proceedings Article | 17 February 2017 Paper

In vivo preclinical verification of a multimodal diffuse reflectance and correlation spectroscopy system for sensing tissue perfusion

Julia Pakela, Seung Yup Lee, Taylor Hedrick, Karthik Vishwanath, Michael Helton, Yooree Chung, Noah Kolodziejski, Christopher Staples, Daniel McAdams, Daniel Fernandez, James Christian, Jameson O'Reilly, Dana Farkas, Brent Ward, Stephen Feinberg, Mary-Ann Mycek

Proceedings Volume 10072, 100720U (2017) https://doi.org/10.1117/12.2252620

KEYWORDS: Sensing systems, Reflectance spectroscopy, Tissues, Blood circulation, Blood, In vivo imaging, Diffuse reflectance spectroscopy, Spectroscopes, Tissue optics, Arteries, Skin, Optical fibers, Reflectivity

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Proceedings Article | 14 February 2017 Paper

Novel diffuse optics system for continuous tissue viability monitoring: extended recovery in vivo testing in a porcine flap model

Seung Yup Lee, Julia Pakela, Taylor Hedrick, Karthik Vishwanath, Michael Helton, Yooree Chung, Noah Kolodziejski, Christopher Stapels, Daniel McAdams, Daniel Fernandez, James Christian, Jameson O'Reilly, Dana Farkas, Brent Ward, Stephen Feinberg, Mary-Ann Mycek

Proceedings Volume 10054, 1005413 (2017) https://doi.org/10.1117/12.2252295

KEYWORDS: Tissues, Reflectance spectroscopy, Arteries, Tissue optics, In vivo imaging, Diffuse reflectance spectroscopy, Blood circulation, Surgery, Fiber optics, Veins, Reflectivity, Spectroscopy, Skin, Optical correlators

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Proceedings Article | 17 March 2016 Presentation + Paper

Instrument to detect syncope and the onset of shock

Daniel McAdams, Noah Kolodziejski, Christopher Stapels, Daniel Fernandez, Matthew Podolsky, Dana Farkas, James Christian, Michael Joyner, Christopher Johnson, Norman Paradis

Proceedings Volume 9707, 970706 (2016) https://doi.org/10.1117/12.2212803

KEYWORDS: Blood circulation, Spectroscopes, Speckle, Capillaries, Near infrared, Human subjects, Prototyping, Instrument modeling, Tissues, Blood, Skin, Blood pressure, Tissue optics, Sensors, Heart, Scattering, Oxygen

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Proceedings Article | 7 March 2016 Paper

A scalable correlator for multichannel diffuse correlation spectroscopy

Christopher Stapels, Noah Kolodziejski, Daniel McAdams, Matthew Podolsky, Daniel Fernandez, Dana Farkas, James Christian

Proceedings Volume 9698, 969816 (2016) https://doi.org/10.1117/12.2213114

KEYWORDS: Optical correlators, Tissue optics, Spectroscopes, Diagnostics, Blood circulation, Photons, Singular optics, Sensors, Data analysis, Medical imaging, Blood, Tissues, Correlation function, Spectroscopy

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Proceedings Article | 4 March 2016 Paper

A disposable flexible skin patch for clinical optical perfusion monitoring at multiple depths

Dana Farkas, Noah Kolodziejski, Christopher Stapels, Daniel McAdams, Daniel Fernandez, Matthew Podolsky, James Christian, Brent Ward, Mark Vartarian, Stephen Feinberg, Seung Yup Lee, Urmi Parikh, Mary-Ann Mycek, Michael Joyner, Christopher Johnson, Norman Paradis

Proceedings Volume 9715, 97151H (2016) https://doi.org/10.1117/12.2230988

KEYWORDS: Tissue optics, Diffuse reflectance spectroscopy, Optical fibers, Spectroscopes, Data modeling, Skin, Adhesives, Human subjects, Blood, Blood circulation, Silicon, Light scattering, Epoxies

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Proceedings Article | 4 March 2016 Presentation + Paper

A compact instrument to measure perfusion of vasculature in transplanted maxillofacial free flaps

Noah Kolodziejski, Christopher Stapels, Daniel McAdams, Daniel Fernandez, Matthew Podolsky, Dana Farkas, Brent Ward, Mark Vartarian, Stephen Feinberg, Seung Yup Lee, Urmi Parikh, Mary-Ann Mycek, James Christian

Proceedings Volume 9715, 97150L (2016) https://doi.org/10.1117/12.2212872

KEYWORDS: Diffuse reflectance spectroscopy, Tissue optics, Tissues, Transplantation, Skin, Blood vessels, Correlation function, Diffuse optical imaging, Diffuse optical tomography, Laser speckle imaging, Maxillo-facial surgery, Blood circulation, Scattering, Light scattering, Absorption, Surgery, Sensors, Arteries

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Proceedings Article | 21 September 2015 Paper

Proton-Electron Discrimination Detector (PEDD) for space weather monitoring

Chad Whitney, Erik Johnson, Xiao Jie Chen, Christopher Stapels, Sam Vogel, James Christian

Proceedings Volume 9604, 960405 (2015) https://doi.org/10.1117/12.2188384

KEYWORDS: Sensors, Electrons, Satellites, Crystals, Field programmable gate arrays, Prototyping, Space operations, Particles, Electronics, Silicon

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Proceedings Article | 28 August 2015 Paper

Characterization on Geiger-mode operation of deep diffused silicon APDs

Erik Johnson, Xiao Chen, Mickel McClish, Richard Farrell, Kofi Vanderpuye, James Christian

Proceedings Volume 9609, 96090C (2015) https://doi.org/10.1117/12.2188588

KEYWORDS: Avalanche photodetectors, Diodes, Pulsed laser operation, Quantum efficiency, Capacitance, Silicon, Avalanche photodiodes, Photons, Diffusion, External quantum efficiency

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Proceedings Article | 26 August 2015 Paper

Development of wide-band-gap AlxGa1-xAs (x>0.7) photodiodes

X. J. Chen, Tae Hoon Kang, Mark Hammig, E. Johnson, J. Christian

Proceedings Volume 9593, 95931C (2015) https://doi.org/10.1117/12.2188188

KEYWORDS: Quantum efficiency, Photodiodes, Gallium arsenide, Reflectivity, Silicon, Aluminum, Diodes, Absorption, Ultraviolet radiation, Semiconducting wafers

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Proceedings Article | 24 August 2015 Paper

Characterization of Al0.8Ga0.2As Geiger photodiodes

X. J. Chen, Min Ren, Yaojia Chen, E. Johnson, Joe Campbell, James Christian

Proceedings Volume 9601, 96010W (2015) https://doi.org/10.1117/12.2188473

KEYWORDS: Photodiodes, Diodes, Quantum efficiency, Light emitting diodes, Sensors, Gallium arsenide, Silicon, Aluminum, Etching, Semiconducting wafers

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Proceedings Article | 4 September 2014 Paper

Recent results with a combined gamma-ray and neutron imaging detector

L. Soundara-Pandian, C. Whitney, E. Johnson, R. Vinci, J. Glodo, J. Christian, J. Gervais, Sam Vogel, E. Nagarkar, F. Robertson, M. Squillante, P. Waer

Proceedings Volume 9215, 921503 (2014) https://doi.org/10.1117/12.2066674

KEYWORDS: Gamma radiation, Sensors, Crystals, Gamma ray imaging, Imaging systems, Scintillation, Spatial resolution, Cameras, Coded apertures, Tungsten

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Proceedings Article | 24 October 2012 Paper

Next generation CMOS SSPMs for scintillation detection applications

Xiao Chen, Erik Johnson, Christopher Stapels, Chad Whitney, James Christian

Proceedings Volume 8507, 850704 (2012) https://doi.org/10.1117/12.929841

KEYWORDS: Quantum efficiency, Sensors, Light emitting diodes, Capacitance, Scintillation, CMOS sensors, Photodiodes, Diodes, Ultraviolet radiation, Photodetectors

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Proceedings Article | 28 September 2011 Paper

CMOS solid-state photomultipliers for high energy resolution calorimeters

Erik Johnson, Christopher Stapels, Xiao Jie Chen, Chad Whitney, Eric Chapman, Guy Alberghini, Rich Rines, Frank Augustine, Rory Miskimen, Don Lydon, James Christian

Proceedings Volume 8142, 81420M (2011) https://doi.org/10.1117/12.893766

KEYWORDS: Crystals, Scintillators, Photomultipliers, Gamma radiation, Sensors, Avalanche photodetectors, Scintillation, Solid state electronics, Diodes, Quantum efficiency

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Proceedings Article | 28 September 2011 Paper

Cryogenic CMOS avalanche diodes for nuclear physics research

Xiao Jie Chen, Erik Johnson, Christopher Stapels, Chad Whitney, Eric Chapman, Guy Alberghini, Frank Augustine, Rory Miskimen, James Christian

Proceedings Volume 8142, 81420O (2011) https://doi.org/10.1117/12.893885

KEYWORDS: Avalanche photodetectors, Diodes, Quantum efficiency, Cryogenics, Light emitting diodes, Photons, Avalanche photodiodes, Ionization, Magnetism, Optical fibers

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Proceedings Article | 13 May 2011 Paper

CMOS solid state photomultipliers for ultra-low light levels

Erik Johnson, Christopher Stapels, Xaio Jie Chen, Chad Whitney, Eric Chapman, Guy Alberghini, Rich Rines, Frank Augustine, James Christian

Proceedings Volume 8033, 80330R (2011) https://doi.org/10.1117/12.886116

KEYWORDS: Diodes, Quantum efficiency, Capacitance, Photons, Resistors, Photodiodes, Silicon, Resistance, Photomultipliers, Error analysis

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Proceedings Article | 16 March 2011 Paper

6-Li enriched Cs2LiYCl6:Ce based thermal neutron detector coupled with CMOS solid-state photomultipliers for a portable detector unit

Chad Whitney, Christopher Stapels, Erik Johnson, Eric Chapman, Guy Alberghini, Jarek Glodo, Kanai Shah, James Christian

Proceedings Volume 7961, 79610U (2011) https://doi.org/10.1117/12.878225

KEYWORDS: Sensors, Gamma radiation, Crystals, CMOS sensors, Scintillation, Scintillators, Solid state electronics, Photomultipliers, Prototyping, Signal detection

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Proceedings Article | 18 August 2010 Paper

Optical and noise performance of CMOS solid-state photomultipliers

Xiao Jie Chen, Erik Johnson, Christopher Staples, Eric Chapman, Guy Alberghini, James Christian

Proceedings Volume 7781, 77810F (2010) https://doi.org/10.1117/12.860494

KEYWORDS: Quantum efficiency, Diodes, Doping, Photons, Silicon, Photodetectors, Photodiodes, Solid state electronics, Photomultipliers, Sensors

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Proceedings Article | 17 February 2010 Paper

CMOS Geiger-mode avalanche photodiode detectors for time and intensity resolved measurements

William Lawrence, Tani Tozian, Christopher Stapels, James Christian, Gregory Derderian, Jeffrey Derderian, Gyula Varadi

Proceedings Volume 7594, 75940I (2010) https://doi.org/10.1117/12.839239

KEYWORDS: Sensors, Field programmable gate arrays, Luminescence, Quantum dots, Quenching (fluorescence), CMOS sensors, Detector arrays, Clocks, Photon counting, Avalanche photodiodes

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Proceedings Article | 23 September 2009 Paper

Prototype CMOS SSPM solar particle dosimeter with tissue-equivalent sensor

C. Stapels, E. Johnson, S. Mukhopadhyay, E. Chapman, J. Christian, Eric Benton

Proceedings Volume 7438, 743812 (2009) https://doi.org/10.1117/12.825500

KEYWORDS: Particles, Sensors, Scintillators, Prototyping, Scintillation, Tissues, Iron, Ions, Signal processing, Electronics

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Proceedings Article | 12 September 2009 Paper

Comparison of neutron sensitive scintillators for use with a solid-state optical detector

Sharmistha Mukhopadhyay, Christopher Stapels, Eric Johnson, Eric Chapman, Paul Linsay, Thomas Prettyman, Michael Squillante, James Christian

Proceedings Volume 7449, 74491P (2009) https://doi.org/10.1117/12.830150

KEYWORDS: Sensors, Crystals, Gamma radiation, Helium, Scintillators, Scintillation, Monte Carlo methods, Solid state electronics, Glasses, Optics manufacturing

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Proceedings Article | 18 February 2009 Paper

Solid state photomultipliers and Geiger photodiodes with integrated readout and signal processing

C. Stapels, E. Johnson, S. Mukhopadhyay, P. Linsay, E. Chapman, J. Christian

Proceedings Volume 7220, 72200H (2009) https://doi.org/10.1117/12.812104

KEYWORDS: Signal processing, Sensors, Signal detection, Electronics, Capacitance, Silicon, Diodes, Solid state photomultipliers, Photodiodes, Photomultipliers

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Proceedings Article | 3 September 2008 Paper

Neutron detectors based on CMOS solid state photomultipliers

Radia Sia, James Christian, Christopher Stapels, Thomas Prettyman, Michael Squillante

Proceedings Volume 7080, 70800G (2008) https://doi.org/10.1117/12.800757

KEYWORDS: Scintillators, Sensors, Gamma radiation, Scintillation, CMOS sensors, Photomultipliers, Solid state photomultipliers, Boron, Crystals, Solid state electronics

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Proceedings Article | 26 August 2008 Paper

CMOS Geiger photodiode array with integrated signal processing for imaging of 2D objects using quantum dots

Christopher Stapels, William Lawrence, Rajan Gurjar, Erik Johnson, James Christian

Proceedings Volume 7055, 70550S (2008) https://doi.org/10.1117/12.796329

KEYWORDS: Sensors, Prototyping, Signal processing, Quenching (fluorescence), Imaging arrays, Photodiodes, CMOS sensors, Molecules, Quantum efficiency, Photography

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Proceedings Article | 15 April 2008 Paper

Nuclear material detection techniques

James Christian, Radia Sia, Purushottam Dokhale, Irina Shestakova, Vivek Nagarkar, Kanai Shah, Erik Johnson, Christopher Stapels, James Ryan, John Macri, Ulisse Bravar, Ka-Ngo Leung, Michael Squillante

Proceedings Volume 6945, 69451Q (2008) https://doi.org/10.1117/12.778730

KEYWORDS: Sensors, Gamma radiation, Imaging systems, Solid state electronics, Scintillators, Coded apertures, Standoff detection, Cameras, Telescopes, Detector development

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Proceedings Article | 23 February 2006 Paper

Development of a solid state photomultiplier based on an array of Geiger mode CMOS avalanche photodiodes

William Lawrence, Christopher Stapels, Frank Augustine, James Christian

Proceedings Volume 6119, 611906 (2006) https://doi.org/10.1117/12.644917

KEYWORDS: Sensors, Crystals, Prototyping, Photodetectors, Optical character recognition, Avalanche photodiodes, Scintillators, Avalanche photodetectors, Solid state electronics, Photomultipliers

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Proceedings Article | 21 February 2006 Paper

A 16-channel avalanche photodiode detector array for visible and near-infrared flow cytometry

William Lawrence, Christopher Stapels, Richard Farrell, Joseph Tario, Jr., Edward Podniesinski, Paul Wallace, James Christian

Proceedings Volume 6088, 60880T (2006) https://doi.org/10.1117/12.644888

KEYWORDS: Avalanche photodetectors, Sensors, Luminescence, Near infrared, Detector arrays, Calibration, Avalanche photodiodes, Flow cytometry, Signal detection, Light emitting diodes

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Proceedings Article | 25 October 2005 Paper

Single photon detection using Geiger mode CMOS avalanche photodiodes

William Lawrence, Christopher Stapels, Frank Augustine, James Christian

Proceedings Volume 6013, 601308 (2005) https://doi.org/10.1117/12.630679

KEYWORDS: Quenching (fluorescence), Sensors, Avalanche photodetectors, CMOS sensors, Avalanche photodiodes, Temperature metrology, Photodiodes, Photon counting, Light emitting diodes, Photodetectors

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Proceedings Article | 21 September 2005 Paper

APD-based x-ray imaging telescope using Fresnel zone plates for extremely high spatial resolution

Michael Squillante, Richard Myers, Mitchell Woodring, James Christian, Frank Robertson, Richard Farrell, Alexander Kogan, Timothy Tiernan, Gerald Entine

Proceedings Volume 5923, 59230Q (2005) https://doi.org/10.1117/12.618452

KEYWORDS: Avalanche photodetectors, Zone plates, X-ray telescopes, X-rays, Space telescopes, Telescopes, Spatial resolution, X-ray imaging, Sensors, Gamma radiation

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Proceedings Article | 7 April 2005 Paper

Development and characterization of CMOS avalanche photodiode arrays

William Lawrence, James Christian, Frank Augustine, Michael Squillante, Gerald Entine

Proceedings Volume 5726, (2005) https://doi.org/10.1117/12.591351

KEYWORDS: Avalanche photodetectors, Photons, Quenching (fluorescence), Sensors, Pulsed laser operation, Prototyping, Avalanche photodiodes, Photodiodes, CMOS sensors, Luminescence

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Proceedings Article | 22 September 2003 Paper

Recent advances in very large area avalanche photodiodes

Michael Squillante, James Christian, Gerald Entine, Richard Farrell, Arieh Karger, Mickel McClish, Richard Myers, Kanai Shah, David Taylor, Kofi Vanderpuye, Peter Waer, Mitchell Woodring

Proceedings Volume 5071, (2003) https://doi.org/10.1117/12.517444

KEYWORDS: Avalanche photodetectors, LIDAR, Sensors, Silicon, Avalanche photodiodes, Laser induced breakdown spectroscopy, Manufacturing, Gamma radiation, Chemical elements, X-rays

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Proceedings Article | 10 January 2003 Paper

Multiplexed avalanche photodiode arrays for radiation imaging

Mitchell Woodring, Richard Farrell, James Christian, Alex Kogan, Michael Squillante, Gerald Entine, David Wehe

Proceedings Volume 4784, (2003) https://doi.org/10.1117/12.455977

KEYWORDS: Avalanche photodetectors, Sensors, Diodes, Avalanche photodiodes, Field effect transistors, Electronics, Imaging systems, Interference (communication), Diffusion, Iron

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Proceedings Article | 24 April 1998 Paper

Femtosecond spectroscopy of heme proteins

Paul Champion, Florin Rosca, Weizhi Wang, Anand Kumar, James Christian, Andrey Demidov

Proceedings Volume 3273, (1998) https://doi.org/10.1117/12.306112

KEYWORDS: Fluorescence correlation spectroscopy, Raman spectroscopy, Proteins, Iron, Photolysis, Femtosecond phenomena, Spectroscopy, Raman scattering, Chemical species, Chromophores

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Showing 5 of 41 publications

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