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.
Towards a life-time-limited 8-octave-infrared photoconductive germanium detector
Journal of Physics: Conference Series ; 647 ; 012070
2015
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Cooled Germanium bolometer as far infrared detector
Engineering Index Backfile | 1965
|5.0901 Mid-wave/Long-wave Infrared Dual-Octave Hyperspectral Imaging Spectrometer
British Library Conference Proceedings | 2003
|Integration of a Photoconductive Detector with a 4 K Cryocooler
British Library Conference Proceedings | 1997
|