High speed hot-electron superconducting bolometer

G. N. Gol'tsman

doi:10.1117/12.2298488

30 August 1993 High speed hot-electron superconducting bolometer

G. N. Gol'tsman

Proceedings Volume 2104, 18th International Conference on Infrared and Millimeter Waves; 21041K (1993) https://doi.org/10.1117/12.2298488
Event: 18th International Conference on Infrared and Millimeter Waves, 1993, Colchester, United Kingdom

Abstract

Physical limitation of response time of a superconducting bolometer as well asthe nature of non-equilibrium detection of radiation have been investigated forAl, Nb and NbN thin films in spectral range from submillimeter to near-infraredwavelengths [1,2]. In the case of ideal heat removal from the film with the f_`. 100A thickness the detection mechanism is an electron heating effect that is notselective to radiation wavelength in a very broad range. The response time ofan electron heating bolometer is determined by an electron-phonon interactiontime. This time is of about 10 ns, 0.5 ns and 20 ps for Al, Nb, and NbNcorrespondingly near the critical temperature of the superconducting film. Thesensitive area of the bolometer consists of a number of narrow strips (with awidth of 1Ã‚Âµm) connected in parallel to contact pads; these pads together witha sapphire substrate and a ground plate represent the microstrip transmissionline with an impedance of 50 Q.

Citation Download Citation

G. N. Gol'tsman "High speed hot-electron superconducting bolometer", Proc. SPIE 2104, 18th International Conference on Infrared and Millimeter Waves, 21041K (30 August 1993); https://doi.org/10.1117/12.2298488

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