A robust bandpass filter for mid- and far-infrared cryogenic space telescopes by simple photo-lithography

Takehiko Wada; Kasumi Miyata; Lisa Toyoshima; Masahiro Ueda; Riki Chin; Yoshinori Shohmitsu; Toyoaki Suzuki; Toshihiro Nakaoka

doi:10.1117/12.3019632

23 August 2024 A robust bandpass filter for mid- and far-infrared cryogenic space telescopes by simple photo-lithography

Takehiko Wada, Kasumi Miyata, Lisa Toyoshima, Masahiro Ueda, Riki Chin, Yoshinori Shohmitsu, Toyoaki Suzuki, Toshihiro Nakaoka

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 1309238 (2024) https://doi.org/10.1117/12.3019632
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

We have developed a robust bandpass filter that is suitable for use in mid- and far-infrared cryogenic space telescopes using simple photolithography. The filter consists of Babinet complementary metamaterial mirrors, which are sub-wavelength holes on a silicon wafer with metalized rim and bottom, and non-metalized side wall. The mirrors work as a “Fabry-Perot interference” type bandpass filter and have a spectral resolving power of R~10. The central wavelength is tunable by adjusting the optical distance between the surface and the bottom. It has higher mechanical toughness compared to conventional metal mesh-filters because of the support of the silicon wafer. It also has higher resistance to thermal cycles compared to conventional multi-layer filters because of its simple structure. The central wavelength can be configured only by the sub-wavelength structure without changing the depth of the holes, so that monolithic filters with different central wavelengths at each position can be fabricated.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Takehiko Wada, Kasumi Miyata, Lisa Toyoshima, Masahiro Ueda, Riki Chin, Yoshinori Shohmitsu, Toyoaki Suzuki, and Toshihiro Nakaoka "A robust bandpass filter for mid- and far-infrared cryogenic space telescopes by simple photo-lithography", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 1309238 (23 August 2024); https://doi.org/10.1117/12.3019632

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