Towards a life-time-limited 8-octave-infrared photoconductive germanium detector

Ultrafast, ultra-broad-band photoconductive detector based on heavily doped and highly compensated germanium has been demonstrated. Such a material demonstrates optical sensitivity in the more than 8 octaves, in the infrared, from about 2 mm to about 8 μm. The spectral sensitivity peaks up between 2...

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Bibliographic Details
Published in:Journal of physics. Conference series 2015-10, Vol.647 (1), p.12070
Main Authors: Pavlov, S G, Deßmann, N, Pohl, A, Abrosimov, N V, Mittendorff, M, Winnerl, S, Zhukavin, R Kh, Tsyplenkov, V V, Shengurov, D V, Shastin, V N, Hübers, H-W
Format: Article
Language:English
Subjects:
Free electrons
Germanium
Helium
Infrared detectors
Liquid helium
Liquid nitrogen
Octaves
Physics
Response time
Sensors
Spectral sensitivity
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Summary:Ultrafast, ultra-broad-band photoconductive detector based on heavily doped and highly compensated germanium has been demonstrated. Such a material demonstrates optical sensitivity in the more than 8 octaves, in the infrared, from about 2 mm to about 8 μm. The spectral sensitivity peaks up between 2 THz and 2.5 THz and is slowly reduced towards lower and higher frequencies. The life times of free electrons holes measured by a pump-probe technique approach a few tenths of picoseconds and remain almost independent on the optical input intensity and on the temperature of a detector in the operation range. During operation, a detector is cooled down to liquid helium temperature but has been approved to detect, with a reduced sensitivity, up to liquid nitrogen temperature. The response time is shorter than 200 ps that is significantly faster than previously reported times.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/647/1/012070