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Proceedings Paper

Characterising the electrothermal properties of microstrip-coupled TES detectors
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Paper Abstract

Microstrip-coupled Transition Edge Sensors (TESs) are important because they can be combined with waveguide-horn technology to produce sensitive bolometric detectors with well-defined, single-mode beam patterns and polarisation characteristics. They also allow superconducting RF filters to be included on the detector chips. Our own design of TES uses a finline taper to transform between waveguide and superconducting Nb microstrip. The microstrip transports the signal to a matched Au-Cu resistor, which is deposited on a thermally isolated SiN membrane. The dissipated RF power causes the resistance of a Mo-Cu TES bilayer to increase, and the resulting reduction in bias current is read out by a SQUID. We have fabricated TES bilayers with critical temperatures of 400 to 600mK, and deduced dark NEPs as low as 3x10-17W/√Hz at 150GHz. In this paper we describe a number of experiments that were carried out in order to investigate the electrothermal behaviour of microstrip-coupled TESs. We show that the electrothermal behaviour of microstrip-coupled TESs can be as good as that of free-space TESs, and therefore that they are suitable for high-performance astronomical applications.

Paper Details

Date Published: 6 July 2006
PDF: 12 pages
Proc. SPIE 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, 627507 (6 July 2006); doi: 10.1117/12.671052
Show Author Affiliations
Louisa Dunlop, Cavendish Lab., Univ. of Cambridge (United Kingdom)
Dorota M. Glowacka, Cavendish Lab., Univ. of Cambridge (United Kingdom)
David J. Goldie, Cavendish Lab., Univ. of Cambridge (United Kingdom)
Stafford Withington, Cavendish Lab., Univ. of Cambridge (United Kingdom)
Ghassan Yassin, Univ. of Oxford (United Kingdom)


Published in SPIE Proceedings Vol. 6275:
Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III
Jonas Zmuidzinas; Wayne S. Holland; Stafford Withington; William D. Duncan, Editor(s)

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