Audley, Michael D. and de Lange, G. and Gao, J.R. and Khosropanah, P. and Hijmering, Richard and Ridder, Marcel and Mauskopf, P.D. and Morozov, Dmitry and Trappe, Neil and Doherty, Stephen (2016) Optical performance of an ultra-sensitive horn-coupled transition-edge-sensor bolometer with hemispherical backshort in the far infrared. Review of Scientific Instruments, 87 (043103). ISSN 0034-6748

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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≈2aW/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.

Item Type:	Article
Keywords:	Bolometers; Photons; Radiation detectors; Optical sensors; Superconducting detectors; Far infrared detectors; Apertures;
Academic Unit:	Faculty of Science and Engineering > Experimental Physics
Item ID:	9829
Identification Number:	https://doi.org/10.1063/1.4945302
Depositing User:	Dr. Neil Trappe
Date Deposited:	24 Aug 2018 15:36
Journal or Publication Title:	Review of Scientific Instruments
Publisher:	AIP Publishing
Refereed:	Yes
URI:	https://aip.scitation.org
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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