Development of high-throughput silicon lens and grism with moth-eye anti-reflection structure

Takafumi Kamizuka; Takashi Miyata; Shigeyuki Sako; Hiroaki Imada; Ryou Ohsawa; Kentaro Asano; Mizuho Uchiyama; Kazushi Okada; Masahito Uchiyama; Takehiko Wada; Takao Nakagawa; Tomohiko Nakamura; Itsuki Sakon; Takashi Onaka

doi:10.1117/12.2055756

28 July 2014 Development of high-throughput silicon lens and grism with moth-eye anti-reflection structure

Takafumi Kamizuka, Takashi Miyata, Shigeyuki Sako, Hiroaki Imada, Ryou Ohsawa, Kentaro Asano, Mizuho Uchiyama, Kazushi Okada, Masahito Uchiyama, Takehiko Wada, Takao Nakagawa, Tomohiko Nakamura, Itsuki Sakon, Takashi Onaka

Author Affiliations +

Proceedings Volume 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation; 91515G (2014) https://doi.org/10.1117/12.2055756
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

Anti-reflection (AR) is very important for high-throughput optical elements. The durability against cooling is required for the AR structure in the cryogenic optics used for mid-infrared astronomical instruments. Moth-eye structure is a promising AR technique strong against cooling. The silicon lens and grism with the moth-eye structure are being developed to make high-throughput elements for long-wavelength mid-infrared instruments. A double-sided moth-eye plano-convex lens (Effective diameter: 33 mm, Focal length: 188 mm) was fabricated. By the transmittance measurement, it was confirmed that its total throughput is 1.7± 0.1 times higher than bare silicon lenses in a wide wavelength range of 20{45 μm. It suggests that the lens can achieve 83±5% throughput in the cryogenic temperature. It was also confirmed that the moth-eye processing on the lens does not modify the focal length. As for the grism, the homogeneous moth-eye processing on blaze pattern was realized by employing spray coating for the resist coating in EB lithography. The silicon grism with good surface roughness was also developed. The required techniques for completing moth-eye grisms have been established.

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Takafumi Kamizuka, Takashi Miyata, Shigeyuki Sako, Hiroaki Imada, Ryou Ohsawa, Kentaro Asano, Mizuho Uchiyama, Kazushi Okada, Masahito Uchiyama, Takehiko Wada, Takao Nakagawa, Tomohiko Nakamura, Itsuki Sakon, and Takashi Onaka "Development of high-throughput silicon lens and grism with moth-eye anti-reflection structure", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91515G (28 July 2014); https://doi.org/10.1117/12.2055756

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