S. Marchetti et R. Simili, TRANSVERSE MIR FAST-RESPONSE IN PBSE FILMS, International journal of infrared and millimeter waves, 15(7), 1994, pp. 1335-1338
Under lightening anisotropic semiconductor or semimetal films can show
large transverse voltage. PbSe and PbS films have a room temperature
intense sub nsec response (approximately V/MW) in the 10 mum region du
e to free carrier photon drag but the effective direct matched respons
e on a 50 OMEGA impedance is lower (approximately 0.1 V/MW for 1 cm2 f
ilm) because of the high film resistance (> KW). CO2 500ps mode locked
pulses are easily detected in the scope limit.