Fundamental noise processes in TES devices

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Microcalorimeters and bolometers are noise-limited devices, therefore, a proper understanding of all noise sources is essential to predict and interpret their performance. In this paper, I review the fundamental noise processes contributing to Transition Edge Sensor (TES) microcalorimeters and bolometers and their effect on device performance. In particular, I will start with a simple, monolithic device model, moving to a more complex one involving discrete components, to finally move to today's more realistic, comprehensive model. In addition to the basic noise contribution (equilibrium Johnson noise and phonon noise), TES are significantly affected by extra noise, which is commonly referred to as "excess noise". Different fundamental processes have been proposed and investigated to explain the origin of this excess noise, in particular near equilibrium non-linear Johnson noise, flux-flow noise, and internal thermal fluctuation noise. Experimental evidence shows that all three processes are real and contribute, at different levels, to the TES noise, although different processes become important at different regimes. It is therefore time to discard the term "excess noise" and consider these terms part of the "fundamental noise processes" instead.

Original languageEnglish (US)
Article number5643118
Pages (from-to)267-271
Number of pages5
JournalIEEE Transactions on Applied Superconductivity
Volume21
Issue number3 PART 1
DOIs
StatePublished - Jun 1 2011

Keywords

  • Superconducting device noise
  • Transition edge sensors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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