Abstract
Picosecond nonequilibrium and slow bolometric responses to infrared radiation from a patterned high-T c superconducting (HTS) film in resistive and normal states deposited onto LaAlO3, NdGaO3, and MgO substrates were investigated using both pulse and modulation techniques. The response time of 35 ps to a laser pulse of 17 ps FWHM has been observed. The intrinsic response time of the fast process is expected to be about a few picoseconds. The modulation technique, being free from the disadvantages of pulse methods (poor sensitivity, limited dynamic range), makes the detailed study of a number of relaxation processes possible. Besides the nonequilibrium response, two kinds of bolometric processes, namely phonon transport through the film-substrate interface and phonon thermal diffusion in a substrate, manifest themselves in certain frequency dependences.
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Zorin, M., Lindgren, M., Danerud, M. et al. Nonequilibrium and bolometric responses of YBaCuO thin films to high-frequency modulated laser radiation. J Supercond 8, 11–15 (1995). https://doi.org/10.1007/BF00732234
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DOI: https://doi.org/10.1007/BF00732234