Optical characterization of OMT-Coupled TES bolometers for LiteBIRD

Hubmayr, J, et, al. and Tucker, Carole ORCID: https://orcid.org/0000-0002-1851-3918 2022. Optical characterization of OMT-Coupled TES bolometers for LiteBIRD. Journal of Low Temperature Physics 209 10.1007/s10909-022-02808-7

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Abstract

Feedhorn- and orthomode transducer- (OMT) coupled transition edge sensor (TES) bolometers have been designed and micro-fabricated to meet the optical specifications of the LiteBIRD high frequency telescope (HFT) focal plane. We discuss the design and optical characterization of two LiteBIRD HFT detector types: dual-polarization, dual-frequency-band pixels with 195/280 GHz and 235/337 GHz band centers. Results show well-matched passbands between orthogonal polarization channels and frequency centers within 3% of the design values. The optical efficiency of each frequency channel is conservatively reported to be within the range 0.64−0.72, determined from the response to a cryogenic, temperature-controlled thermal source. These values are in good agreement with expectations and either exceed or are within 10% of the values used in the LiteBIRD sensitivity forecast. Lastly, we report a measurement of loss in Nb/SiNx/Nb microstrip at 100 mK and over the frequency range 200–350 GHz, which is comparable to values previously reported in the literature.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Physics and Astronomy
Date of Acceptance:	24 July 2022
Last Modified:	13 Feb 2023 11:15
URI:	https://orca.cardiff.ac.uk/id/eprint/156617

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