PT Journal
AU Gershenzon, EM
   Gol'tsman, GN
   Semenov, AD
   Sergeev, AV
TI Mechanism of picosecond response of granular YBaCuO films to electromagnetic radiation
SO Solid State Communications
JI Solid State Communications
PY 1990
BP 493
EP 497
VL 76
IS 4
DI 10.1016/0038-1098(90)90656-V
DE YBCO HTS detectors
AB The ultrafast mechanisms of radiation detection in granular YBaCuO films are studied in the wide wavelength range from millimeter to near infrared. With the rise of radiation frequency the Josephson detection at the grain boundary weak links is replaced by electron heating into the grains. This change occurs in the submillimeter wavelength range. Electron-phonon relaxation time τeph is determined by direct measurements and analyses quasistationary electron heating. Temperature dependence of τeph at T ≤ 40 K was found to be τeph ∼ T−1. The results show that detectors with the response time of few picoseconds at nitrogen temperature are attainable.
ER