19 July 2016 Performance of horn-coupled transition edge sensors for L- and S-band optical detection on the SAFARI instrument
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Abstract
We describe the geometry, architecture, dark- and optical performance of ultra-low-noise transition edge sensors as THz detectors for the SAFARI instrument. The TESs are fabricated from superconducting Mo/Au bilayers coupled to impedance-matched superconducting β-phase Ta thin-film absorbers. The detectors have phonon-limited dark noise equivalent powers of order 0.5 - 1.0 aW/ √ Hz and saturation powers of order 20 - 40 fW. The low temperature test configuration incorporating micro-machined backshorts is also described, and construction and typical performance characteristics for the optical load are shown. We report preliminary measurements of the optical performance of these TESs for two SAFARI bands; L-band at 110 − 210 μm and S-band 34 − 60 μm .
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D. J. Goldie, D. M. Glowacka, S. Withington, Jiajun Chen, P. A. R. Ade, D. Morozov, R. Sudiwala, N. A. Trappe, O. Quaranta, "Performance of horn-coupled transition edge sensors for L- and S-band optical detection on the SAFARI instrument", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99140A (19 July 2016); doi: 10.1117/12.2232740; https://doi.org/10.1117/12.2232740
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