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Humboldt-Universität zu Berlin - Faculty of Mathematics and Natural Sciences - Optical Systems

Humboldt-Universität zu Berlin | Faculty of Mathematics and Natural Sciences | Department of Physics | Optical Systems | Publications | Towards a life-time-limited 8-octave-infrared photoconductive germanium detector

S.G. Pavlov, N. Deßmann, Andreas Pohl, Nickolay Abrosimov, Martin Mittendorff, S. Winnerl, R.Kh. Zhukavin, V.V. Tsyplenkov, D.V. Shengurov, V.N. Shastin, and Heinz-Wilhelm Hübers (2015)

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

Journal of Physics: Conference Series, 647:012070.

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 m. 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.

infrared untrafast broad-band photoconductive detector