Non-thermal response of a diffusion-cooled hot-electron bolometer

We present an analysis of a diffusion-cooled hot-electron bolometer in the limiting case of a weak thermalization of non-equilibrium quasiparticles. We propose a new model relying on the non-thermal suppression of the superconducting energy gap by excess quasiparticles. Using material parameters typ...

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Published in:IEEE transactions on applied superconductivity 1999-06, Vol.9 (2), p.4491-4494
Main Authors: Semenov, A.D., Gol'tsman, G.N.
Format: Article
Language:English
Subjects:
Bandwidth
Bolometers
Constraining
Diffusion
Electrons
Energy gap
Frequency
Noise temperature
Oscillators
Physics
Superconducting device noise
Superconducting materials
Superconducting transition temperature
Superconductivity
Temperature dependence
Temperature distribution
Terahertz frequencies
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description We present an analysis of a diffusion-cooled hot-electron bolometer in the limiting case of a weak thermalization of non-equilibrium quasiparticles. We propose a new model relying on the non-thermal suppression of the superconducting energy gap by excess quasiparticles. Using material parameters typical for Al, we evaluate performance of the bolometer in the heterodyne regime at terahertz frequencies. Estimates show that the mixer may have quantum limited noise temperature and a few tens of GHz bandwidth, while the required local oscillator power is in the /spl mu/W range due to in-effective suppression of the energy gap by quasiparticles with high energies.
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subjects Bandwidth
Bolometers
Constraining
Diffusion
Electrons
Energy gap
Frequency
Noise temperature
Oscillators
Physics
Superconducting device noise
Superconducting materials
Superconducting transition temperature
Superconductivity
Temperature dependence
Temperature distribution
Terahertz frequencies
title Non-thermal response of a diffusion-cooled hot-electron bolometer
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