PT Unknown
AU Karasik, BS
   Lindgren, M
   Zorin, MA
   Danerud, M
   Winkler, D
   Trifonov, VV
   Gol’tsman, GN
   Gershenzon, EM
TI Picosecond detection and broadband mixing of near-infrared radiation by YBaCuO films
SE Proc. SPIE
PY 1994
BP 68
EP 76
VL 2159
DI 10.1117/12.176131
DE YBCO HTS HEB mixer
AB Nonequilibrium picosecond and bolometric responses of YBCO films 500 angstroms thick patterned into 20 X 20 micrometers [super:2] size structure to 17 ps laser pulses and modulated radiation of GaAs and CO[sub:2] lasers have been studied. The modulation frequencies up to 10 GHz for GaAs laser and up to 1 GHz for CO[sub:2] were attained. The use of small radiation power (1 - 10 mW/cm[super:2] for cw radiation and 10 - 100 nJ/cm[super:2] for pulse radiation) in combination with high sensitive read-out system made possible to avoid any non-linear transient processes caused by an overheating of sample above a critical temperature or S-N switching enhanced by an intense radiation. Responses due to the change of kinetic inductance were believed to be negligible. The only signals observed were caused by a small change of the film resistance either in the resistive state created by a bias current or in the normal state. The data obtained by means of pulse and modulation techniques are in agreement. The responsivity about 1 V/W was measured at 1 GHz modulation frequency both for 0.85 micrometers and 10.6 micrometers wavelengths. The sensitivity of high-T[sub:c] fast wideband infrared detector is discussed.
ER