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Optical characterization of OMT-coupled TES bolometers for LiteBIRD

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.

 Autoría: Hubmayr J., Ade P.A.R., 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., Beck D., Beckman S., Benabed K., Bermejo-Ballesteros J., Bersanelli M., Bonis J., Borrill J., Bouchet F., Boulanger F., Bounissou S., Brilenkov M., Brown M.L., Bucher M., Calabrese E.,

 Fuente: Journal of Low Temperature Physics, 2022, 209(3-4), 396-408

 Editorial: Springer

 Año de publicación: 2022

 Nº de páginas: 13

 Tipo de publicación: Artículo de Revista

 DOI: 10.1007/s10909-022-02808-7

 ISSN: 0022-2291,1573-7357

 Url de la publicación: http://doi.org/10.1007/s10909-022-02808-7