Optical performance of an ultra-sensitive horn-coupled transition-edge-sensor bolometer with hemispherical backshort in the far infrared

Journal article (2016)

Authors

Michael D. Audley SRON–Netherlands Institute for Space Research
Gert De Lange SRON–Netherlands Institute for Space Research
J.R. Gao QN/Gao Lab , SRON–Netherlands Institute for Space Research
Pourya Khosropanah SRON–Netherlands Institute for Space Research
R. A. Hijmering SRON–Netherlands Institute for Space Research
Marcel L. Ridder SRON–Netherlands Institute for Space Research
Philip D. Mauskopf Cardiff University
Dmitry Morozov Cardiff University
Neil A. Trappe Maynooth University
Stephen Doherty Maynooth University
Research Group
QN/Gao Lab
Copyright: © 2016 Michael D. Audley, Gert De Lange, J.R. Gao, Pourya Khosropanah, Richard Hijmering, Marcel Ridder, Philip D. Mauskopf, Dmitry Morozov, Neil A. Trappe, Stephen Doherty
DOI: https://doi.org/10.1063/1.4945302
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Published Date

05-04-2016

Language

English

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Research Group

QN/Gao Lab

Abstract

The next generation of far infrared space observatories will require extremely sensitive detectors that can be realized only by combining extremely low intrinsic noise with high optical efficiency. We have measured the broad-band optical response of ultra-sensitive transtion edge sensor (TES) bolometers (NEP ≈ 2 aW / Hz) in the 30-60-μm band where radiation is coupled to the detectors with a few-moded conical feedhorn and a hemispherical backshort. We show that these detectors have an optical efficiency of 60% (the ratio of the power detected by the TES bolometer to the total power propagating through the feedhorn). We find that the measured optical efficiency can be understood in terms of the modes propagating through the feedhorn with the aid of a spatial mode-filtering technique.

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