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IEEE Transactions on Applied Superconductivity

Superconducting transition-edge bolometer in a resistive and in an inductive mode

Heikki Seppä

Published Mar 1, 2001• 12 citations
Publisher

Abstract

We analyze the energy resolution of a superconducting transition-edge bolometer (STEB) biased with an ac current. We will show that the ac readout method enables us to utilize STEB either monitoring the change in dissipation due to the change in temperature or the change in inductance owing to the increased in number of quasiparticles.
DOI
10.1109/77.919456

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It has been recently demonstrated that superconducting transition edge-sensors behave as weak-links due to longitudinally induced superconductivity from the leads with higher Tc. In this work we study the implication of this behaviour for transition-edge sensors (TES)-based bolometers and microcalorimeter under ac bias. The TESs are read-out at frequencies between 1 and 5 MHz by a frequency domain multiplexer based on a linearised two-stage SQUID amplifier and high-Q lithographically made superconducting LC resonators. In particular, we focus on SRON TiAu TES bolometers with a measured dark noise equivalent power of 3.2 \\times 10 -19 W/\\sqrt{Hz} developed for the short wavelength band for the instrument SAFARI on the SPICA telescope.