A two-dimensional hot-spot mixer model for phonon-cooled hot electron bolometers

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A two-dimensional hot-spot mixer model for phonon-cooled hot electron bolometers

Journal Article (2001)

Author(s)

Harald F. Merkel (University of Gothenburg, Chalmers University of Technology)

Pourya Khosropanah (University of Gothenburg, Chalmers University of Technology)

Serguei Cherednichenko (Chalmers University of Technology, University of Gothenburg)

K. Sigfrid Yngvesson (University of Massachusetts Amherst)

Aurèle Adam (University of Gothenburg, Chalmers University of Technology)

Erik L. Kollberg (Chalmers University of Technology, University of Gothenburg)

Hot spot Hot electron bolometer Heat trapping

DOI related publication

https://doi.org/10.1109/77.919314 Final published version

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https://resolver.tudelft.nl/uuid:63355ca7-8bf3-42f4-afba-a73d442f7c61

More Info

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Publication Year

2001

Language

English

Journal title

IEEE Transactions on Applied Superconductivity

Issue number

1

Volume number

11

Pages (from-to)

179-182

Downloads counter

95

Abstract

A hot spot model for superconducting hot electron bolometers is presented based on a two-dimensional heat transport equation for electrons and phonons including heat trapping due to quasiparticle bandgap gradients. Skin effect concentrates the RF heating in lateral regions of the bridge and the bias current in the center. A reduction in conversion gain compared to a one-dimensional hot spot model is explained by the RF and bias heating profiles not being identical. An experimentally verified increase of the IF bandwidth from 3.5 GHz to 8 GHz when increasing bias voltage is predicted. IV curves, gain and noise are in very good agreement with measurements.