Dr. J. Wen Profile

Dr. J. Wen

at Brimrose Technology Corp.

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Proceedings Article | 6 June 2023 Presentation + Paper

Picosecond (Cd,Mg)Te detectors for both optical and x-ray photons

J. Cheng, I. Komissarov, D. Chakraborty, S. Kutcher, J. Wen, H. Chen, S. Trivedi, Roman Sobolewski

Proceedings Volume 12570, 125700C (2023) https://doi.org/10.1117/12.2670238

KEYWORDS: Crystals, Magnesium, X-ray optics, Picosecond phenomena, X-rays, Cadmium, X-ray detectors, Electrodes, Tellurium, Photodetectors

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We present a photodetector capable of detecting both optical and x-ray picosecond pulses, based on our in-house grown cadmium magnesium telluride (Cd,Mg)Te single crystals. We focused on a specific Cd_0.97Mg_0.03Te, In-doped crystal composition, because of its bandgap suitable for 800-nm-wavelength light detection and a single-picosecond optical photoresponse. The detector was fabricated as a planar metal-semiconductor-metal structure with interdigitated electrodes and exhibited a linear, Schottky-free, current-voltage characteristics with <40-pA dark current and up to 20-mA/W responsivity. The detector temporal resolution was measured to be ~200-ps full-width-at-half-maximum transient, in response of ~100-fs-wide pulses consisting of either optical (800-nm wavelength) or x-ray (4.5-keV) photons and was limited by the detector housing and 15-GHz bandwidth of the readout oscilloscope. The latter demonstrates the detector is suitable for coarse timing in x-ray free-electron laser/optical femtosecond pump-probe spectroscopy applications. We also demonstrated that due to its very high stopping power, the Cd_0.97Mg_0.03Te detector responded well to various nuclear gamma sources with energy ranging from 59.6-keV to 660-keV.

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