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International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

High speed hot-electron superconducting bolometer

G. N. Gol'tsman

Published Aug 30, 1993• 0 citations
Publisher
DOI
10.1117/12.2298488

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International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)•Aug 28, 2022•1 citation
A hot-electron transition-edge superconducting bolometer with adjustable thermal relaxation speed is proposed. The bolometer contacts are made from a superconductor with high critical temperature which blocks the thermal diffusion of hot carriers into the contacts. Thus electron-phonon interaction is the only mechanism for heat removal. The speed of thermal relaxation for hot electrons in a nanometre-size superconducting bolometer with T c = 100-300 mK is controlled by the elastic electron mean free path l . The relaxation rate behaves as T 4 l at subkelvin temperatures and can be reduced by a factor of 10-100 by decreasing l . Then an antenna- or waveguide-coupled bolometer with a time constant ~10 -3 -10 -4 s will exhibit photon-noise-limited performance at millimetre and submillimetre wavelengths. The bolometer will have a figure of merit NEP 1/2 = 10 -23 -10 -22 J -1 at 100 mK which is 10 3 -10 4 times better (i.e. smaller) than that of a state-of-the-art bolometer. A tremendous increase in speed and sensitivity will have a significant impact for observational mapping applications.