Study on optical filter heating in background limited detector experiments

Bueno, J., de Visser, P.J., Doyle, Simon ORCID: https://orcid.org/0000-0002-9054-986X and Baselmans, J.J.A. 2014. Study on optical filter heating in background limited detector experiments. Journal of Low Temperature Physics 176 (5-6) , pp. 1089-1095. 10.1007/s10909-014-1184-7

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Abstract

Cryogenic test setups with controlled stray light environments capable of reaching ultra-low radiative background levels are required to test far infrared (FIR) and submillimeter (sub-mm) wave radiation detectors for future space based observatories. In recent experiments (Nature Commun 5:3130, 2014), in which 1.54 THz radiation was coupled onto an antenna-coupled kinetic inductance detector (KID), we found a higher than expected optical loading. We show that this can be explained by assuming heating of the metal mesh IR filters and re-radiation onto the KID. Note that the total power from the cryogenic black body source used in the experiments (at T = 3 –25 K) is much larger than the power inside the 1.5 –1.6 THz band we use to calibrate our detector. The out-of-band radiation can have up to 5 orders of magnitude more power than inside the 1.5 –1.6 THz band of interest. A strategy to mitigate the filter heating problem is presented, and when it is implemented, the validated upper limit for stray light at the detector level is down to few aW.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	Springer
ISSN:	0022-2291
Date of Acceptance:	5 April 2014
Last Modified:	31 Oct 2022 08:59
URI:	https://orca.cardiff.ac.uk/id/eprint/79385

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