Fabrication and characterization of a NIR-FIR dichroic for the infrared interferometer BETTII

Dhabal, Arnab, Rinehart, Stephen A, Silverberg, Robert F, Fixsen, Dale, Mentzell, John E, Veach, Todd, Kasica, Richard, Zhang, Jessie, Tucker, Carole ORCID: https://orcid.org/0000-0002-1851-3918 and Ade, Peter ORCID: https://orcid.org/0000-0002-5127-0401 2018. Fabrication and characterization of a NIR-FIR dichroic for the infrared interferometer BETTII. Presented at: SPIE Astronomical Telescopes + Instrumentation, 10-15 June 2018. Proceedings Volume 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX. , vol.10708 SPIE, 10.1117/12.2312146

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Abstract

BETTII is a balloon-borne far infrared (FIR: 30-100 μm) interferometer that also uses a near-infrared (NIR: 1-2.5 μm) channel for fine pointing sensing using stars. We have developed an inductive grid dichroic to divide the incoming beam into two components, by reflecting FIR light and transmitting NIR light. The dichroic is fabricated using focused electron beam technology to produce a 1 μm period, 100 nm width metal grid on a sapphire substrate in order to have high reflectance for FIR wavelengths. Here we discuss the design and the detailed manufacturing process for such a dichroic. The transmission and reflectance characteristics are also presented. We discuss them in context of the BETTII requirements....

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Published Online
Status:	Published
Schools:	Physics and Astronomy
Publisher:	SPIE
Last Modified:	24 Apr 2023 13:45
URI:	https://orca.cardiff.ac.uk/id/eprint/156694

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