Metal mesh IR filter for wSMA

Chao-Te Li; C.-Y. E. Tong; Ming-Jye Wang; Tse-Jun Chen; Yen-Pin Chang; Sheng-Feng Yen; Jen-Chieh Cheng; Wei-Chun Lu; Yen-Ru Huang

doi:10.1117/12.2561174

13 December 2020 Metal mesh IR filter for wSMA

Chao-Te Li, C.-Y. E. Tong, Ming-Jye Wang, Tse-Jun Chen, Yen-Pin Chang, Sheng-Feng Yen, Jen-Chieh Cheng, Wei-Chun Lu, Yen-Ru Huang

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Proceedings Volume 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X; 114534J (2020) https://doi.org/10.1117/12.2561174
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

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Abstract

Since the start of full science operations from 2004, the Submillimeter Array has been implementing plans to expand IF bandwidths and upgrade receivers and cryostats. Metal mesh low-pass filters were designed to block infrared (IR) radiation to reduce the thermal load on the cryostats. Filters were fabricated on a quartz wafer through photolithography and coated with anti-reflection (AR) material. The filters were tested from 200 to 400 GHz to verify their passband performances. The measurement results were found to be in good agreement with EM simulation results. They were tested in the far-infrared (FIR) frequency range to verify out-of-band rejection. The IR reflectivity was found to be approximately 70%, which corresponded to the percentage of the area blocked by metal.

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Chao-Te Li, C.-Y. E. Tong, Ming-Jye Wang, Tse-Jun Chen, Yen-Pin Chang, Sheng-Feng Yen, Jen-Chieh Cheng, Wei-Chun Lu, and Yen-Ru Huang "Metal mesh IR filter for wSMA", Proc. SPIE 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, 114534J (13 December 2020); https://doi.org/10.1117/12.2561174

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