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

Arnab Dhabal; Stephen A. Rinehart; Robert F. Silverberg; Dale Fixsen; John E. Mentzell; Todd Veach; Richard Kasica; Jessie Zhang; Carole Tucker; Peter Ade

doi:10.1117/12.2312146

9 July 2018 Fabrication and characterization of a NIR-FIR dichroic for the infrared interferometer BETTII

Arnab Dhabal, Stephen A. Rinehart, Robert F. Silverberg, Dale Fixsen, John E. Mentzell, Todd Veach, Richard Kasica, Jessie Zhang, Carole Tucker, Peter Ade

Author Affiliations +

Proceedings Volume 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX; 107083I (2018) https://doi.org/10.1117/12.2312146
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

Citation Download Citation

Arnab Dhabal, Stephen A. Rinehart, Robert F. Silverberg, Dale Fixsen, John E. Mentzell, Todd Veach, Richard Kasica, Jessie Zhang, Carole Tucker, and Peter Ade "Fabrication and characterization of a NIR-FIR dichroic for the infrared interferometer BETTII", Proc. SPIE 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX, 107083I (9 July 2018); https://doi.org/10.1117/12.2312146

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