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| Content Provider | Springer Nature Link |
|---|---|
| Author | Siritanasak, P. Aleman, C. Arld, K. Cukierman, A. Hazumi, M. Kazemzadeh, K. Keating, B. Matsumura, T. Lee, A. T. Lee, C. Quealy, E. Rosen, D. Stebor, N. Suzuki, A. |
| Copyright Year | 2015 |
| Abstract | Polarbear-2 (PB-2) is a next-generation receiver that is part of the Simons Array cosmic microwave background (CMB) polarization experiment which is located in the Atacama desert in Northern Chile. The primary scientific goals of the Simons Array are a deep search for the CMB B-mode signature of gravitational waves from inflation and the characterization of large-scale structure using its effect on CMB polarization. The PB-2 receiver will deploy with 1897 dual-polarization sinuous antenna-coupled pixels, each with a directly contacting extended hemispherical silicon lens. Every pixel has dual polarization sensitivity in two spectral bands centered at 95 and 150 GHz, for a total of 7588 transition edge sensor bolometers operating at 270 mK. To achieve the PB-2 detector requirements, we developed a broadband anti-reflection (AR) coating for the extended hemispherical lenses that uses two molds to apply two layers of epoxy, Stycast 1090 and Stycast 2850FT. Our measurements of the absorption loss from the AR coating on a flat surface at cryogenic temperatures show less than 1 % absorption, and the coating has survived multiple thermal cycles. We can control the diameter of the coating within 25 $${μ }$$ m and translation errors are within 25 $${μ }$$ m in all directions, which results in less than 1 % decrease in transmittance. We also find the performance of the AR-coated lens matches very well with simulations. |
| Starting Page | 553 |
| Ending Page | 558 |
| Page Count | 6 |
| File Format | |
| ISSN | 00222291 |
| Journal | Journal of Low Temperature Physics |
| Volume Number | 184 |
| Issue Number | 3-4 |
| e-ISSN | 15737357 |
| Language | English |
| Publisher | Springer US |
| Publisher Date | 2015-12-08 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Polarbear-2 Anti-reflection coating Extended hemispherical silicon lenses Condensed Matter Physics Characterization and Evaluation of Materials Magnetism, Magnetic Materials |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science |
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