Frequency selective surfaces offer new possibilities as reflectance filters in the NIR/visible spectrum

Walsh, Gary F.; Osgood, R. M.; Ziegler, David; Roy, Moumita; Carlson, Joel; Belton, Lauren; Kimball, Brian R.

doi:10.1117/12.795295

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Dichroic Design1

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“…Comparable techniques have been used in the recent past, but for metal slot based FSS fabrication. 22,23 Other techniques of grid fabrication involve photolithography 24 and laser ablation, 25 but neither are suitable for our linewidth and resolution requirements. The inductive grid is made of Au for high conductivity.…”

Section: Dichroic Designmentioning

confidence: 99%

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

Dhabal

Rinehart

Silverberg

et al. 2018

Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX

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BETTII is a balloon-borne far infra-red (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.

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