Simulations of athermal phonon propagation in a cryogenic semiconducting bolometer

S. L. Stever, F. Couchot, B. Maffei

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We present three Monte Carlo models for the propagation of athermal phonons in the diamond absorber of a composite semiconducting bolometer a€Bolo 184'. Previous measurements of the response of this bolometer to impacts by α particles show a strong dependence on the location of particle incidence, and the shape of the response function is determined by the propagation and thermalisation of athermal phonons. The specific mechanisms of athermal phonon propagation at this time were undetermined, and hence we have developed three models for probing this behaviour by attempting to reproduce the statistical features seen in the experimental data. The first two models assume a phonon thermalisation length determined by a mean free path λ, where the first model assumes that phonons thermalise at the borders of the disc (with a small λ) and the second assumes that they reflect (with a λ larger than the size of the disc). The third model allows athermal photons to propagate along their geometrical line of sight (similar to ray optics), gradually losing energy. We find that both the reflective model and the geometrical model reproduce the features seen in experimental data, whilst the model assuming phonon thermalisation at the disc border produces unrealistic results. There is no significant dependence on directionality of energy absorption in the geometrical model, and in the schema of this thin crystalline diamond, a reflective absorber law and a geometrical law both produce consistent results.

Original languageEnglish
Title of host publicationMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X
EditorsJonas Zmuidzinas, Jian-Rong Gao
PublisherSPIE
ISBN (Electronic)9781510636934
DOIs
Publication statusPublished - 2020
EventMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X 2020 - Virtual, Online, United States
Duration: Dec 14 2020Dec 22 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11453
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X 2020
Country/TerritoryUnited States
CityVirtual, Online
Period12/14/2012/22/20

Keywords

  • low-Temperature deetectors
  • particle effects
  • semiconducting bolometers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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