Two-layer anti-reflection coating with mullite and polyimide foam for large-diameter cryogenic infrared filters

Yuki Inoue; Takaho Hamada; Masaya Hasegawa; Masashi Hazumi; Yasuto Hori; Aritoki Suzuki; Takayuki Tomaru; Tomotake Matsumura; Toshifumi Sakata; Tomoyuki Minamoto; Tohru Hirai

doi:10.1364/AO.55.000D22

Two-layer anti-reflection coating with mullite and polyimide foam for large-diameter cryogenic infrared filters

Yuki Inoue, Takaho Hamada, Masaya Hasegawa, Masashi Hazumi, Yasuto Hori, Aritoki Suzuki, Takayuki Tomaru, Tomotake Matsumura, Toshifumi Sakata, Tomoyuki Minamoto, Tohru Hirai

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

We have developed a novel two-layer anti-reflection (AR) coating method for large-diameter infrared (IR) filters made of alumina, for use at cryogenic temperatures in millimeter wave measurements. Thermally sprayed mullite and polyimide foam (Skybond Foam) are used as the AR material. An advantage of the Skybond Foam is that the index of refraction is chosen between 1.1 and 1.7 by changing the filling factor. Combination with mullite is suitable for wide-band millimeter wave measurements with sufficient IR cutoff capability. We present the material properties, fabrication of a large-diameter IR filter made of alumina with this AR coating method, and characterizations at cryogenic temperatures. This technology can be applied to a low-temperature receiver system with a large-diameter focal plane for next-generation cosmic microwave background polarization measurements, such as POLARBEAR-2 (PB-2).

Original language	English
Pages (from-to)	D22-D28
Journal	Applied Optics
Volume	55
Issue number	34
DOIs	https://doi.org/10.1364/AO.55.000D22
State	Published - 1 Dec 2016

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title = "Two-layer anti-reflection coating with mullite and polyimide foam for large-diameter cryogenic infrared filters",

abstract = "We have developed a novel two-layer anti-reflection (AR) coating method for large-diameter infrared (IR) filters made of alumina, for use at cryogenic temperatures in millimeter wave measurements. Thermally sprayed mullite and polyimide foam (Skybond Foam) are used as the AR material. An advantage of the Skybond Foam is that the index of refraction is chosen between 1.1 and 1.7 by changing the filling factor. Combination with mullite is suitable for wide-band millimeter wave measurements with sufficient IR cutoff capability. We present the material properties, fabrication of a large-diameter IR filter made of alumina with this AR coating method, and characterizations at cryogenic temperatures. This technology can be applied to a low-temperature receiver system with a large-diameter focal plane for next-generation cosmic microwave background polarization measurements, such as POLARBEAR-2 (PB-2).",

author = "Yuki Inoue and Takaho Hamada and Masaya Hasegawa and Masashi Hazumi and Yasuto Hori and Aritoki Suzuki and Takayuki Tomaru and Tomotake Matsumura and Toshifumi Sakata and Tomoyuki Minamoto and Tohru Hirai",

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T1 - Two-layer anti-reflection coating with mullite and polyimide foam for large-diameter cryogenic infrared filters

AU - Inoue, Yuki

AU - Hamada, Takaho

AU - Hasegawa, Masaya

AU - Hazumi, Masashi

AU - Hori, Yasuto

AU - Suzuki, Aritoki

AU - Tomaru, Takayuki

AU - Matsumura, Tomotake

AU - Sakata, Toshifumi

AU - Minamoto, Tomoyuki

AU - Hirai, Tohru

PY - 2016/12/1

Y1 - 2016/12/1

N2 - We have developed a novel two-layer anti-reflection (AR) coating method for large-diameter infrared (IR) filters made of alumina, for use at cryogenic temperatures in millimeter wave measurements. Thermally sprayed mullite and polyimide foam (Skybond Foam) are used as the AR material. An advantage of the Skybond Foam is that the index of refraction is chosen between 1.1 and 1.7 by changing the filling factor. Combination with mullite is suitable for wide-band millimeter wave measurements with sufficient IR cutoff capability. We present the material properties, fabrication of a large-diameter IR filter made of alumina with this AR coating method, and characterizations at cryogenic temperatures. This technology can be applied to a low-temperature receiver system with a large-diameter focal plane for next-generation cosmic microwave background polarization measurements, such as POLARBEAR-2 (PB-2).

AB - We have developed a novel two-layer anti-reflection (AR) coating method for large-diameter infrared (IR) filters made of alumina, for use at cryogenic temperatures in millimeter wave measurements. Thermally sprayed mullite and polyimide foam (Skybond Foam) are used as the AR material. An advantage of the Skybond Foam is that the index of refraction is chosen between 1.1 and 1.7 by changing the filling factor. Combination with mullite is suitable for wide-band millimeter wave measurements with sufficient IR cutoff capability. We present the material properties, fabrication of a large-diameter IR filter made of alumina with this AR coating method, and characterizations at cryogenic temperatures. This technology can be applied to a low-temperature receiver system with a large-diameter focal plane for next-generation cosmic microwave background polarization measurements, such as POLARBEAR-2 (PB-2).

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U2 - 10.1364/AO.55.000D22

DO - 10.1364/AO.55.000D22

M3 - 期刊論文

AN - SCOPUS:85006275071

SN - 1559-128X

VL - 55

SP - D22-D28

JO - Applied Optics

JF - Applied Optics

IS - 34

ER -

Two-layer anti-reflection coating with mullite and polyimide foam for large-diameter cryogenic infrared filters

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