Optimization of an optical testbed for characterization of EXCLAIM µ-Spec integrated spectrometers

Rahmani, Maryam, Barrentine, Emily M., Switzer, Eric R., Barlis, Alyssa, Brown, Ari D., Cataldo, Giuseppe, Connors, Jake A., Ehsan, Negar, Essinger-Hileman, Thomas M., Grant, Henry, Hays-Wehle, James, Hsieh, Wen-Ting, Mikula, Vilem, Moseley, S. Harvey, Noroozian, Omid, Quijada, Manuel A., Patel, Jessica, Stevenson, Thomas R., Tucker, Carole ORCID: https://orcid.org/0000-0002-1851-3918, U-Yen, Kongpop, Volpert, Carolyn G. and Wollack, Edward J. 2025. Optimization of an optical testbed for characterization of EXCLAIM µ-Spec integrated spectrometers. Journal of Low Temperature Physics 218 , pp. 65-73. 10.1007/s10909-024-03240-9 Item availability restricted.

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Abstract

We describe a testbed to characterize the optical response of compact superconducting on-chip spectrometers in development for the EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) mission. EXCLAIM is a balloon-borne far-infrared experiment to probe the CO and CII emission lines in galaxies from redshift 3.5 to the present. The spectrometer, called µ-Spec, comprises a diffraction grating on a silicon chip coupled to kinetic inductance detectors (KIDs) read out via a single microwave feedline. We use a prototype spectrometer for EXCLAIM to demonstrate our ability to characterize the spectrometer’s spectral response using a photomixer source. We utilize an on-chip reference detector to remove the spectral structure introduced by the off-chip optics and a silicon etalon to calibrate the absolute frequency.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Publisher:	Springer
ISSN:	0022-2291
Date of First Compliant Deposit:	22 November 2024
Date of Acceptance:	26 October 2024
Last Modified:	25 Oct 2025 00:30
URI:	https://orca.cardiff.ac.uk/id/eprint/174234

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