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

Applied Optics
Vol. 55,
Issue 34,
pp. D22-D28
(2016)
•https://doi.org/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, and Tohru Hirai

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Yuki Inoue, Takaho Hamada, Masaya Hasegawa, Masashi Hazumi, Yasuto Hori, Aritoki Suzuki, Takayuki Tomaru, Tomotake Matsumura, Toshifumi Sakata, Tomoyuki Minamoto, and Tohru Hirai, "Two-layer anti-reflection coating with mullite and polyimide foam for large-diameter cryogenic infrared filters," Appl. Opt. 55, D22-D28 (2016)

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The topics in this list come from the Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Infrared (040.3060)
- Far infrared or terahertz (040.2235)
- Astronomy and astrophysics (350.1270)
- Microwaves (350.4010)
- Antireflection coatings (310.1210)

About this Article
History
- Original Manuscript: July 11, 2016
- Revised Manuscript: August 11, 2016
- Manuscript Accepted: August 22, 2016
- Published: September 22, 2016

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).

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Material	T [K]	$d$ [mm]	$n$	$\tan δ$ [ $\times 10^{- 4}$ ]
Alumina	298	$1.98 \pm 0.01$	$3.144 \pm 0.005$	$3.7 \pm 1.7$
Mullite	298	$0.24 \pm 0.02$	$2.52 \pm 0.02$	$121 \pm 16$
Skybond Foam	298	$0.39 \pm 0.02$	$1.436 \pm 0.025$	$120 \pm 2$
Alumina	81	–	$3.117 \pm 0.005$	$3.0 \pm 1.1$
Mullite	81	–	$2.46 \pm 0.03$	$53 \pm 10$
Skybond Foam	81	–	$1.425 \pm 0.025$	$25 \pm 1$

	$d$ [mm]		$n$		Optical Path Length [mm]
	mean	rms	mean	rms	Optical Path Length [mm]
Mullite	0.250	0.010	2.46	0.063	0.016
Skybond Foam	0.391	0.008	1.43	0.020	0.009

Material	T [K]	$d$ [mm]	$n$	$\tan δ$ [ $\times 10^{- 4}$ ]
Alumina	298	$1.98 \pm 0.01$	$3.144 \pm 0.005$	$3.7 \pm 1.7$
Mullite	298	$0.24 \pm 0.02$	$2.52 \pm 0.02$	$121 \pm 16$
Skybond Foam	298	$0.39 \pm 0.02$	$1.436 \pm 0.025$	$120 \pm 2$
Alumina	81	–	$3.117 \pm 0.005$	$3.0 \pm 1.1$
Mullite	81	–	$2.46 \pm 0.03$	$53 \pm 10$
Skybond Foam	81	–	$1.425 \pm 0.025$	$25 \pm 1$

	$d$ [mm]		$n$		Optical Path Length [mm]
	mean	rms	mean	rms	Optical Path Length [mm]
Mullite	0.250	0.010	2.46	0.063	0.016
Skybond Foam	0.391	0.008	1.43	0.020	0.009

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