Optical characterization and testbed development for μ-Spec integrated spectrometers

Rahmani, Maryam, Barlis, Alyssa, Barrentine, Emily M., Brown, Ari D., Bulcha, Berhanu T., Cataldo, Giuseppe, Connors, Jake A., Ehsan, Negar, Essinger-Hileman, Thomas, Grant, Henry, Hays-Wehle, Jim, Hsieh, Wen-Ting, Mikula, Vilem, Moseley, Harvey, Noroozian, Omid, Oxholm, Trevor R., Quijada, Manuel A., Patel, Jessica, Stevenson, Thomas R., Switzer, Eric R., Tucker, Carole ORCID: https://orcid.org/0000-0002-1851-3918, U-Yen, Kongpop, Volport, Carolyn G., Wollack, Edward J., Coyle, Laura E., Perrin, Marshall D. and Matsuura, Shuji 2022. Optical characterization and testbed development for μ-Spec integrated spectrometers. Presented at: SPIE Astronomical Telescopes + Instrumentation, Montréal, Québec, Canada, 17-22 July 2022. Proceedings SPIE Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave. , vol.12180 SPIE, 10.1117/12.2630311

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Abstract

This paper describes a cryogenic optical testbed developed to characterize µ-Spec spectrometers in a dedicated dilution refrigerator (DR) system. μ-Spec is a far-infrared integrated spectrometer that is an analog to a Rowland-type grating spectrometer. It employs a single-crystal silicon substrate with niobium microstrip lines and aluminum kinetic inductance detectors (KIDs). Current designs with a resolution of R = λ/Δλ = 512 are in fabrication for the EXCLAIM (Experiment for Cryogenic Large Aperture Intensity Mapping) balloon mission. The primary spectrometer performance and design parameters are efficiency, NEP, inter-channel isolation, spectral resolution, and frequency response for each channel. Here we present the development and design of an optical characterization facility and preliminary validation of that facility with earlier prototype R=64 devices. We have conducted and describe initial optical measurements of R = 64 devices using a swept photomixer line source. We also discuss the test plan for optical characterization of the EXCLAIM R = 512 μ-Spec devices in this new testbed.

Item Type:	Conference or Workshop Item (Poster)
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	SPIE
Last Modified:	27 Mar 2023 14:45
URI:	https://orca.cardiff.ac.uk/id/eprint/157932

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