Dr. Jae Sub E. Hong Profile

Dr. Jae Sub E. Hong

Senior Research Scientist at Harvard Univ

SPIE Involvement:

Author

Publications (39)

Proceedings Article | 6 October 2023 Presentation

Development of replicated Wolter x-ray optics for SmallSats

Suzanne Romaine, Ricardo Bruni, Jae Sub Hong

Proceedings Volume 12679, 126790E (2023) https://doi.org/10.1117/12.2678228

KEYWORDS: X-ray optics, Nickel

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SPIE Journal Paper | 24 March 2023

Imaging effects due to pixel distortions in CdZnTe detectors—results from the HREXI Calibration Facility

Arkadip Basak, Branden Allen, Jae Sub Hong, Daniel Violette, Jonathan Grindlay

JATIS, Vol. 9, Issue 01, 018005, (March 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.1.018005

KEYWORDS: Image restoration, Telescopes, Signal to noise ratio, X-rays, Detector arrays, Calibration, X-ray sources, X-ray detectors, Spatial resolution, Detector development

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SPIE Journal Paper | 31 January 2023

Tuning of nuclear spectroscopic telescope array application specific integrated circuits to improve low energy threshold of future hard x-ray imaging detectors

Daniel Violette, Branden Allen, Jae Sub Hong, Hiromasa Miyasaka, Jonathan Grindlay

JATIS, Vol. 9, Issue 01, 016001, (January 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.1.016001

KEYWORDS: Application specific integrated circuits, Image resolution, Telescopes, Detector arrays, X-ray telescopes, Analog electronics, Spectroscopy, Pixel resolution, Spectroscopes, Capacitors

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Proceedings Article | 31 August 2022 Presentation + Paper

VOXI: Versatile Optics for X-ray Imaging

Suzanne Romaine, Jae Sub Hong, Martin Elvis

Proceedings Volume 12181, 1218113 (2022) https://doi.org/10.1117/12.2630660

KEYWORDS: X-ray optics, X-rays, X-ray imaging, Multilayers, Physics, Coating, Astrophysics, X-ray telescopes, Mirrors, Ceramics

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SPIE Journal Paper | 4 July 2022

Testing station for fast screening of through silicon via-enabled application-specific integrated circuits for hard x-ray imaging detectors

Daniel Violette, Branden Allen, Jaesub Hong, Hiromasa Miyasaka, Jonathan Grindlay

JATIS, Vol. 8, Issue 03, 036001, (July 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.3.036001

KEYWORDS: Sensors, Silicon, Wafer testing, Image resolution, Semiconducting wafers, Hard x-rays, Detector arrays, Application specific integrated circuits, X-rays, X-ray telescopes

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SPIE Journal Paper | 22 December 2021

Performance of a directly deposited optical blocking filter on x-ray CCDs: case study from the REgolith X-ray Imaging Spectrometer (REXIS) experiment

Carolyn Thayer, Rebecca Masterson, Branden Allen, Kevin Ryu, Marshall Bautz, Solan Megerssa, Mark Chodas, David Guevel, Daniel Hoak, Jaesub Hong, Madeline Lambert, Jonathan Grindlay, Richard Binzel

JATIS, Vol. 7, Issue 04, 046001, (December 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.4.046001

KEYWORDS: Charge-coupled devices, X-rays, X-ray optics, Sensors, Asteroids, Optical filters, X-ray imaging, High power microwaves, Spectroscopy, Environmental sensing

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Proceedings Article | 5 August 2021 Presentation

Optimization of CdZnTe low energy threshold utilizing readout ASIC charge pumping for the High-Resolution Energetic X-ray Imager SmallSat Explorer

Daniel Violette, Jaesub Hong, Branden Allen, Jonathan Grindlay

Proceedings Volume 11821, 118210S (2021) https://doi.org/10.1117/12.2594853

KEYWORDS: X-ray imaging, Sensors, Hard x-rays, X-rays, X-ray telescopes, X-ray detectors, Telescopes, Stars, Spectroscopy, Spectral resolution

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Proceedings Article | 2 August 2021 Poster

Evaluating the projected performance of Wolter-I X-ray telescope designs for SmallSats

Leandra Sethares, Suzanne Romaine, Jae Sub Hong, Kiranmayee Kilaru

Proceedings Volume 11822, 118221C (2021) https://doi.org/10.1117/12.2594195

KEYWORDS: X-ray telescopes, Optical instrument design, X-ray optics, Optical design, Jupiter, Exosphere

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SPIE Journal Paper | 9 April 2021

Proof of concept for through silicon vias in application-specific integrated circuits for hard x-ray imaging detectors

Jaesub Hong, Jonathan Grindlay, Branden Allen, Daniel Violette, Hiromasa Miyasaka, Dean Malta, Jennifer Ovental, David Bordelon, Daniel Richter

JATIS, Vol. 7, Issue 02, 026001, (April 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.2.026001

KEYWORDS: Sensors, Semiconducting wafers, Silicon, Application specific integrated circuits, Copper, Signal processing, Etching, X-ray telescopes, Spectral resolution, Packaging

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SPIE Journal Paper | 22 April 2020

HREXI calibration facility: mapping out subpixel-level responses from high-resolution cadmium zinc telluride imaging x-ray detectors

Arkadip Basak, Branden Allen, Jaesub Hong, Daniel Violette, Jonathan Grindlay

JATIS, Vol. 6, Issue 02, 026002, (April 2020) https://doi.org/10.1117/12.10.1117/1.JATIS.6.2.026002

KEYWORDS: Sensors, Calibration, Tungsten, X-ray detectors, X-rays, Cadmium, Zinc, Lead, Aluminum, Detector development

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Proceedings Article | 11 September 2019 Paper

Evaluating the projected performance of Wolter-I x-ray telescope designs for SmallSats

L. Sethares, V. Cotroneo, J. Hong, V. Kashyap, S. Romaine

Proceedings Volume 11119, 111191Q (2019) https://doi.org/10.1117/12.2531526

KEYWORDS: Optical instrument design, X-ray telescopes, X-ray optics, Optical design, Telescopes, Astrophysics, Optical coatings, Space operations, Geometrical optics

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Proceedings Article | 9 September 2019 Presentation

High-resolution x-ray imaging spectrometer (HREXI) SmallSat Pathfinder (HSP) (Conference Presentation)

Jonathan Grindlay, Branden Allen, Jaesub Hong, Daniel Violette, Martin Elvis, Scott Barthelmy, John Tomsick

Proceedings Volume 11118, 111180X (2019) https://doi.org/10.1117/12.2529855

KEYWORDS: Image resolution, X-ray imaging, Spectroscopy, Coded apertures, X-rays, Astrophysics, Imaging systems, Telescopes, Sensors, Coded aperture imaging

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Proceedings Article | 9 September 2019 Presentation + Paper

SmallSat solar axion and activity x-ray imager (SSAXI)

Jaesub Hong, Suzanne Romaine, Almus Kenter, Christopher Moore, Katharine Reeves, Brian Ramsey, Kiranmayee Kilaru, Julia Vogel, Jaime Ruz Armendariz, Hugh Hudson, Kerstin Perez

Proceedings Volume 11118, 1111810 (2019) https://doi.org/10.1117/12.2529781

KEYWORDS: X-rays, Solar energy, X-ray imaging, Quantum chromodynamics, Solar processes, CMOS sensors, Sensors, X-ray telescopes, Particles, Aluminium phosphide

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Proceedings Article | 9 September 2019 Presentation

Efficient screening of through-silicon-via (TSV) ASICs for CZT x-ray imaging detectors (Conference Presentation)

Daniel Violette, Branden Allen, Jaesub Hong, Jonathan Grindlay

Proceedings Volume 11118, 1111805 (2019) https://doi.org/10.1117/12.2529819

KEYWORDS: Sensors, X-ray imaging, Image sensors, Image resolution, X-ray telescopes, X-ray sources, Crystals, Electronics, Spectroscopy, Telescopes

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Proceedings Article | 9 September 2019 Presentation + Paper

SEEJ: SmallSat Exosphere Explorer of hot Jupiters

Scott Wolk, JaeSub Hong, Suzanne Romaine, Katja Poppenhaeger, Almus Kenter, Althea Moorhead, Dennis Gallagher, Christopher Moore, Martin Elvis, Ralph Kraft, Jeremy Drake, Vinay Kashyap, Elaine Winston, Bradford Wargelin, Ignazio Pillitteri, Diab Jerius, Mark Stahl, Bruce Wiegmann, Christopher Loghry

Proceedings Volume 11118, 111180E (2019) https://doi.org/10.1117/12.2529380

KEYWORDS: Jupiter, Stars, Planets, X-rays, X-ray detectors, Exoplanets, Atmospheric sciences, Magnetism, Atmospheric optics, Atmospheric sensing

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The first detected exoplanets found were "hot Jupiters"; these are large Jupiter-like planets in close orbits with their host star. The stars in these so-called "hot Jupiter systems" can have significant X-ray emission and the X-ray flux likely changes the evolution of the overall star-planetary system in at least two ways: (1) the intense high energy flux alters the structure of the upper atmosphere of the planet - in some cases leading to significant mass loss; (2) the angular momentum and magnetic field of the planet induces even more activity on the star, enhancing its X-rays, which are then subsequently absorbed by the planet. If the alignment of the systems is appropriate, the planet will transit the host star. The resulting drop in flux from the star allows us to measure the distribution of the low-density planetary atmosphere. We describe a science mission concept for a SmallSat Exosphere Explorer of hot Jupiters (SEEJ; pronounced "siege"). SEEJ will monitor the X-ray emission of nearby X-ray bright stars with transiting hot Jupiters in order to measure the lowest density portion of exoplanet atmospheres and the coronae of the exoplanet hosts. SEEJ will use revolutionary Miniature X-ray Optics (MiXO) and CMOS X-ray detectors to obtain sufficient collecting area and high sensitivity in a low mass, small volume and low-cost package. SEEJ will observe scores of transits occurring on select systems to make detailed measurements of the transit depth and shape which can be compared to out-of-transit behavior of the target system. The depth and duration of the flux change will allow us to characterize the exospheres of multiple hot Jupiters in a single year. In addition, the long baselines (covering multiple stellar rotation periods) from the transit data will allow us to characterize the temperature, flux and flare rates of the exoplanet hosts at an unprecedented level. This, in turn, will provide valuable constraints for models of atmospheric loss. In this contribution we outline the science of SEEJ and focus on the enabling technologies Miniature X-ray Optics and CMOS X-ray detectors.

Proceedings Article | 13 September 2018 Presentation + Paper

Efficient validation testing of Through-Silicon-Via (TSV) ASICs for CZT x-ray detectors

Daniel Violette, Branden Allen, Jae Sub Hong, Arkadip Basak, Jonathan Grindlay

Proceedings Volume 10762, 107620S (2018) https://doi.org/10.1117/12.2321694

KEYWORDS: Sensors, X-ray telescopes, Field programmable gate arrays, Semiconducting wafers, X-ray detectors, Crystals, Aluminum, Coded apertures, Spectroscopy, Telescopes

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Proceedings Article | 15 September 2017 Presentation + Paper

Through-Silicon-Vias (TSVs) for 3D readout of ASIC for nearly gapless CdZnTe detector arrays

J. Hong, B. Allen, J. Grindlay, Hiromasa Miyasaka, Jill Burnham, Sangki Hong, Wesker Lei, Scott Barthelmy, Robert Patti, Fiona Harrison

Proceedings Volume 10392, 103920U (2017) https://doi.org/10.1117/12.2274360

KEYWORDS: Sensors, Semiconducting wafers, Plating, Space telescopes, Crystals, Copper, Scanning electron microscopy, Etching, Telescopes, Metals

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Proceedings Article | 19 September 2014 Paper

Modeling the expected performance of the REgolith x-ray imaging spectrometer (REXIS)

Niraj Inamdar, Richard Binzel, Jae Sub Hong, Branden Allen, Jonathan Grindlay, Rebecca Masterson

Proceedings Volume 9222, 922207 (2014) https://doi.org/10.1117/12.2062202

KEYWORDS: Sensors, Asteroids, Calibration, X-rays, Sun, Charge-coupled devices, Error analysis, Spectroscopy, Data modeling, Solids

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Proceedings Article | 24 July 2014 Paper

Miniature lightweight x-ray optics (MiXO) for solar system exploration

J. Hong, S. Romaine

Proceedings Volume 9144, 91441F (2014) https://doi.org/10.1117/12.2056657

KEYWORDS: X-rays, X-ray optics, Mirrors, X-ray imaging, Comets, Solar system, Observatories, Asteroids, Planetary science, X-ray technology

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Proceedings Article | 27 September 2013 Paper

The REgolith X-Ray Imaging Spectrometer (REXIS) for OSIRIS-REx: identifying regional elemental enrichment on asteroids

Branden Allen, Jonathan Grindlay, Jaesub Hong, Richard Binzel, Rebecca Masterson, Niraj Inamdar, Mark Chodas, Matthew Smith, Marshall Bautz, Steven Kissel, Joel Villasenor, Miruna Oprescu, Nicholas Induni

Proceedings Volume 8840, 88400M (2013) https://doi.org/10.1117/12.2041715

KEYWORDS: Asteroids, Sensors, X-rays, Charge-coupled devices, Collimators, Coded apertures, Spatial resolution, Space operations, X-ray imaging, Spectroscopy

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Proceedings Article | 17 September 2010 Paper

Overview of EXIST mission science and implementation

J. Grindlay, N. Gehrels, J. Bloom, P. Coppi, Al. Soderberg, J. Hong, B. Allen, S. Barthelmy, G. Tagliaferri, H. Moseley, A. Kutyrev, G. Fabbiano, G. Fishman, B. Ramsey, R. Della Ceca, L. Natalucci, P. Ubertini

Proceedings Volume 7732, 77321X (2010) https://doi.org/10.1117/12.857895

KEYWORDS: Telescopes, Stars, Galactic astronomy, Space telescopes, Imaging spectroscopy, X-rays, Spectroscopy, Sensors, Space operations, Hard x-rays

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Proceedings Article | 10 August 2010 Paper

The design and capabilities of the EXIST optical and infra-red telescope (IRT)

A. Kutyrev, S. H. Moseley, C. Golisano, Q. Gong, B. Allen, N. Gehrels, J. Grindlay, J. S. Hong, B. Woodgate

Proceedings Volume 7731, 77311Z (2010) https://doi.org/10.1117/12.858309

KEYWORDS: Sensors, Space telescopes, Telescopes, Image resolution, Imaging spectroscopy, Spectroscopes, Spectroscopy, Observatories, Infrared telescopes, Optical instrument design

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Proceedings Article | 30 July 2010 Paper

The proposed high-energy telescope (HET) for EXIST

J. Hong, J. Grindlay, B. Allen, G. Skinner, S. Barthelmy, N. Gehrels, A. Garson, H. Krawczynski, W. Cook, F. Harrison, L. Natalucci, P. Ubertini

Proceedings Volume 7732, 77321Y (2010) https://doi.org/10.1117/12.857713

KEYWORDS: Sensors, X-ray telescopes, Crystals, Hard x-rays, Telescopes, Space telescopes, Photomasks, Electronics, X-ray imaging, Field programmable gate arrays

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Proceedings Article | 30 July 2010 Paper

ProtoEXIST: advanced prototype CZT coded aperture telescopes for EXIST

Branden Allen, Jaesub Hong, Josh Grindlay, Scott Barthelmy, Robert Baker, Neil Gehrels, Trey Garson, Henric Krawczynski, Walter Cook, Fiona Harrison, Jeffrey Apple, Brian Ramsey

Proceedings Volume 7732, 77324D (2010) https://doi.org/10.1117/12.857940

KEYWORDS: Sensors, Telescopes, Space telescopes, Calibration, Stars, Coded apertures, Cameras, Control systems, Magnetometers, Crystals

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Proceedings Article | 3 September 2009 Paper

The high energy telescope on EXIST

J. Hong, J. Grindlay, B. Allen, S. Barthelmy, G. Skinner, N. Gehrels

Proceedings Volume 7435, 74350A (2009) https://doi.org/10.1117/12.826540

KEYWORDS: Sensors, Space telescopes, Image processing, X-ray telescopes, Tungsten, X-rays, Telescopes, X-ray imaging, Crystals, Imaging spectroscopy

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Proceedings Article | 2 September 2009 Paper

The EXIST optical and infra-red telescope (IRT) and imager-spectrometer

A. Kutyrev, S. Moseley, C. Golisano, Q. Gong, B. Allen, N. Gehrels, J. Grindlay, J. S. Hong, B. Woodgate

Proceedings Volume 7453, 745304 (2009) https://doi.org/10.1117/12.826888

KEYWORDS: Sensors, Space telescopes, Telescopes, Image resolution, Imaging spectroscopy, Spectroscopy, Spectroscopes, Infrared sensors, X-ray telescopes, Infrared imaging

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Proceedings Article | 21 August 2009 Paper

Imaging and burst location with the EXIST high-energy telescope

Gerald Skinner, Scott Barthelmy, Mark Finger, Jae Sub Hong, Garrett Jernigan, Steven Sturner, Branden Allen, Jonathan Grindlay

Proceedings Volume 7435, 74350B (2009) https://doi.org/10.1117/12.830184

KEYWORDS: Sensors, Space telescopes, Telescopes, Gamma radiation, Space operations, Spatial resolution, Image restoration, X-rays, Detector arrays, Point spread functions

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The primary instrument of the proposed EXIST mission is a coded mask high energy telescope (the HET), that must have a wide field of view and extremely good sensitivity. In order to achieve the performance goals it will be crucial to minimize systematic errors so that even for very long total integration times the imaging performance is close to the statistical photon limit. There is also a requirement to be able to reconstruct images on-board in near real time in order to detect and localize gamma-ray bursts, as is currently being done by the BAT instrument on Swift. However for EXIST this must be done while the spacecraft is continuously scanning the sky. The scanning provides all-sky coverage and is also a key part of the strategy to reduce systematic errors. The on-board computational problem is made even more challenging for EXIST by the very large number of detector pixels (more than 107, compared with 32768 for BAT). The EXIST HET Imaging Technical Working Group has investigated and compared numerous alternative designs for the HET. The selected baseline concept meets all of the scientific requirements, while being compatible with spacecraft and launch constraints and with those imposed by the infra-red and soft X-ray telescopes that constitute the other key parts of the payload. The approach adopted depends on a unique coded mask with two spatial scales. Coarse elements in the mask are effective over the entire energy band of the instrument and are used to initially locate gamma-ray bursts. A finer mask component provides the good angular resolution needed to refine the burst position and reduces the cosmic X-ray background; it is optimized for operation at low energies and becomes transparent in the upper part of the energy band where an open fraction of 50% is optimal. Monte Carlo simulations and analytic analysis techniques have been used to demonstrate the capabilities of the proposed design and of the two-step burst localization procedure.

Proceedings Article | 21 September 2007 Paper

Wide-field hard x-ray survey telescope: ProtoEXIST1

J. Hong, J. Grindlay, N. Chammas, B. Allen, A. Copete, B. Said, M. Burke, J. Howell, T. Gauron, R. Baker, S. Barthelmy, S. Sheikh, N. Gehrels, W. Cook, J. Burnham, F. Harrison, J. Collins, S. Labov, A. Garson, H. Krawczynski

Proceedings Volume 6706, 67060B (2007) https://doi.org/10.1117/12.736110

KEYWORDS: Sensors, Telescopes, Space telescopes, Electronics, X-ray telescopes, Crystals, Field programmable gate arrays, Hard x-rays, Image resolution, X-rays

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Proceedings Article | 11 September 2006 Paper

CZT in space-based hard x-ray astronomy: background predictions for EXIST

A. Garson, H. Krawczynski, G. Weidenspointner, E. Novikova, J. Grindlay, J. Hong, I. Jung

Proceedings Volume 6319, 63190D (2006) https://doi.org/10.1117/12.684082

KEYWORDS: Sensors, Space telescopes, X-ray telescopes, Atmospheric particles, Cadmium, Zinc, Photons, Particles, X-rays, Hard x-rays

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Proceedings Article | 30 August 2006 Paper

CZT imaging detectors for ProtoEXIST

J. Hong, J. Grindlay, N. Chammas, A. Copete, R. Baker, S. Barthelmy, N. Gehrels, W. Cook, J. Burnham, F. Harrison, J. Collins, W. Craig

Proceedings Volume 6319, 63190S (2006) https://doi.org/10.1117/12.680721

KEYWORDS: Sensors, Crystals, Field programmable gate arrays, Electronics, Barium, Capacitance, Space telescopes, X-rays, Signal processing, Compton scattering

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Proceedings Article | 8 September 2005 Paper

Monte-Carlo simulations of the expected imaging performance of the EXIST high-energy telescope

S. Vadawale, J. Hong, J. Grindlay, G. Skinner

Proceedings Volume 5900, 590014 (2005) https://doi.org/10.1117/12.617671

KEYWORDS: Sensors, Signal to noise ratio, Telescopes, Coded aperture imaging, Crystals, Device simulation, Monte Carlo methods, Image compression, Hard x-rays, Photons

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Proceedings Article | 18 August 2005 Paper

Detector and telescope development for ProtoEXIST and fine beam measurements of spectral response of CZT detectors

J. Hong, A. Copete, J. Grindlay, S. Vadawale, W. Craig, F. Harrison, W. Cook, N. Gehrels

Proceedings Volume 5898, 58980N (2005) https://doi.org/10.1117/12.617630

KEYWORDS: Sensors, Crystals, Space telescopes, X-ray telescopes, Detector development, Telescopes, Optical testing, Collimators, Packaging, Hard x-rays

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Proceedings Article | 21 October 2004 Paper

Laboratory coded-aperture imaging experiments: radial hole coded masks and depth-sensitive CZT detectors

Jae Sub Hong, Santosh Vadawale, Minhua Zhang, Eric Bellm, Andrew Yousef, John Noss, Jonathan Grindlay, Tomohiko Narita

Proceedings Volume 5540, (2004) https://doi.org/10.1117/12.559650

KEYWORDS: Sensors, Crystals, Imaging systems, X-rays, Telescopes, Monte Carlo methods, Hard x-rays, X-ray telescopes, Signal to noise ratio, Electronics

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Proceedings Article | 21 October 2004 Paper

Multipixel characterization of imaging CZT detectors for hard x-ray imaging and spectroscopy

Santosh Vadawale, Jae Sub Hong, Jonathan Grindlay, Peter Williams, Minhua Zhang, Eric Bellm, Tomohiko Narita, William Craig, Bradford Parker, Carl Stahle, Feng Yan

Proceedings Volume 5540, (2004) https://doi.org/10.1117/12.559748

KEYWORDS: Crystals, Crystallography, Sensors, Imaging spectroscopy, Platinum, Image resolution, Indium, Hard x-rays, Gold, Resistance

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Proceedings Article | 3 February 2004 Paper

Anode readout for pixellated CZT detectors

Tomohiko Narita, Jonathan Grindlay, Jaesub Hong, Francis Niestemski

Proceedings Volume 5165, (2004) https://doi.org/10.1117/12.506552

KEYWORDS: Sensors, Image resolution, Spatial resolution, Electrodes, Electrons, Astronomy, X-ray telescopes, Signal detection, X-rays, Signal to noise ratio

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Proceedings Article | 3 February 2004 Paper

Cathode depth sensing in CZT detectors

JaeSub Hong, Eric Bellm, Jonathan Grindlay, Tomohiko Narita

Proceedings Volume 5165, (2004) https://doi.org/10.1117/12.506216

KEYWORDS: Sensors, Crystals, X-rays, X-ray detectors, Signal detection, Electronics, Sensing systems, Calibration, Hard x-rays, Imaging spectroscopy

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Proceedings Article | 29 January 2004 Paper

Optimizing wide-field coded aperture imaging: radial mask holes and scanning

Jonathan Grindlay, JaeSub Hong

Proceedings Volume 5168, (2004) https://doi.org/10.1117/12.506260

KEYWORDS: Sensors, Signal to noise ratio, Coded aperture imaging, Telescopes, Coded apertures, Imaging systems, X-ray telescopes, Hard x-rays, Device simulation, X-ray imaging

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