Optical Characterization of OMT-Coupled TES Bolometers for LiteBIRD

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.; Calvo, M.; Campeti, P.; Carones, A.; Casas, F. J.; Catalano, A.; Challinor, A.; Chan, V.; Cheung, K.; Chinone, Y.; Chiocchetta, C.; Clark, S. E.; Clermont, L.; Clesse, S.; Cliche, J.; Columbro, F.; Connors, J. A.; Coppolecchia, A.; Coulton, W.; Cubas, J.; Cukierman, A.; Curtis, D.; Cuttaia, F.; D'Alessandro, G.; Dachlythra, K.; de Bernardis, P.; de Haan, T.; de la Hoz, E.; De Petris, M.; Della Torre, S.; Diaz Garcia, J. J.; Dickinson, C.; Diego-Palazuelos, P.; Dobbs, M.; Dotani, T.; Douillet, D.; Doumayrou, E.; Duband, L.; Ducout, A.; Duff, S. M.; Duval, J. M.; Ebisawa, K.; Elleflot, T.; Eriksen, H. K.; Errard, J.; Essinger-Hileman, T.; Farrens, S.; Finelli, F.; Flauger, R.; Fleury-Frenette, K.; Franceschet, C.; Fuskeland, U.; Galli, L.; Galli, S.; Galloway, M.; Ganga, K.; Gao, J. R.; Genova-Santos, R. T.; Georges, M.; Gerbino, M.; Gervasi, M.; Ghigna, T.; Giardiello, S.; Gjerlw, E.; Gonzalez Gonzales, R.; Gradziel, M. L.; Grain, J. et al.
Bibliographical reference

Journal of Low Temperature Physics

Advertised on:
11
2022
Number of authors
320
IAC number of authors
4
Citations
4
Refereed citations
2
Description
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.
Type