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/SiN x/Nb microstrip at 100 mK and over the frequency range 200-350 GHz, which is comparable to values previously reported in the literature.

Optical Characterization of OMT-Coupled TES Bolometers for LiteBIRD / Hubmayr, J., Ade, P., Adler, A., Allys, E., Alonso, D., Arnold, K., Auguste, D., Aumont, J., Aurlien, R., Austermann, J.e., Azzoni, S., Baccigalupi, C., Banday, A.j., Banerji, R., Barreiro, R.b., Bartolo, N., Basak, S., Battistelli, E., Bautista, L., Beall, J.a., et al.. - In: JOURNAL OF LOW TEMPERATURE PHYSICS. - ISSN 0022-2291. - 209:3-4(2022), pp. 396-408. [10.1007/s10909-022-02808-7]

Optical Characterization of OMT-Coupled TES Bolometers for LiteBIRD

Baccigalupi, C;
2022-01-01

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/SiN x/Nb microstrip at 100 mK and over the frequency range 200-350 GHz, which is comparable to values previously reported in the literature.
2022
209
3-4
396
408
Hubmayr, J; Ade, Par; Adler, A; Allys, E; Alonso, D; Arnold, K; Auguste, D; Aumont, J; Aurlien, R; Austermann, Je; Azzoni, S; Baccigalupi, C; Banday, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/131511
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