Optical Characterization of OMT-Coupled TES Bolometers for LiteBIRD

CMB; TES; OMT; Low temperature detector; Bolometer Settore FIS/05 Bolometer 600 OMT 02 engineering and technology CMB 01 natural sciences Low temperature detector [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] 0103 physical sciences Bolometer; CMB; Low temperature detector; OMT; TES [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph] 0210 nano-technology TES
DOI: 10.1007/s10909-022-02808-7 Publication Date: 2022-09-05T20:37:13Z
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ABSTRACT
Peer reviewed<br/>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.<br/>This work is supported by NASA under grant no. 80NSSC18K0132.<br/>et al.<br/>
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