CC BY 3.0 UnportedPavlov, S.G.Deßmann, N.Pohl, A.Abrosimov, N.V.Mittendorff, M.Winnerl, S.Zhukavin, R.KTsyplenkov, V.V.Shengurov, D.V.Shastin, V.N.Hübers, H.-W.2022-07-052022-07-052015https://oa.tib.eu/renate/handle/123456789/9513https://doi.org/10.34657/8551Ultrafast, 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.enghttps://creativecommons.org/licenses/by/3.0/530DynamicsGermaniumLiquefied gasesNanostructuresPhotoconductivitySpectroscopySuperfluid heliumHigher frequenciesLiquid helium temperatureLiquid nitrogen temperatureOptical sensitivityPhotoconductive detectorsPump-probe techniqueReduced sensitivitySpectral sensitivityOptoelectronic devicesArticleKonferenzschrift