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SuperSpec: development towards a full-scale filter bank

Wheeler, J., Hailey-Dunsheath, S., Shirokoff, E., Barry, P. S., Bradford, C. M., Chapman, S., Che, G., Glenn, J., Hollister, M., Kovács, A., LeDuc, H. G., Mauskopf, P. ORCID:, McGeehan, R., McKenney, C. M., O'Brient, R., Padin, S., Reck, T., Ross, C., Shiu, C., Tucker, C. E. ORCID:, Williamson, R. and Zmuidzinas, J. 2016. SuperSpec: development towards a full-scale filter bank. Presented at: SPIE Astronomical Telescopes + Instrumentation 2016, Edinburgh, Scotland, 26 June - 1 July 2016. Published in: Holland, Wayne S. and Zmuidzinas, Jonas eds. Proceedings Volume 9914 Millimeter, Submillimeter, and Far Infrared Detectors and Instrumentation for Astronomy VIII. Proceedings of SPIE. , vol.9914 Society of Photo-optical Instrumentation Engineers, 10.1117/12.2233798

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SuperSpec is a new spectrometer-on-a-chip technology for submm/mm-wave spectroscopy. SuperSpec stands out from other direct-detection submm spectrometer technologies in that the detectors are coupled to a series of resonant filters along a single microwave feedline instead of using dispersive optics. SuperSpec makes use of kinetic inductance detectors (KIDs) to detect radiation in this filter bank. The small profile of this design makes SuperSpec a natural choice to produce a multi-object spectrometer for tomographic mapping or galaxy redshift surveys. We have recently fabricated a device that is a 50 channel subset of a full 280 channel filter bank, which would cover the 190 - 310 GHz range at R = 275. Analysis of the data from this device informs us of the potential design modifications to enable a high-yield background-limited SuperSpec spectrometer. The results indicate that this subset filter bank can scale up to a full filter bank with only a few collisions in readout space and less than 20% variation in responsivity for the detectors. Additionally, the characterization of this and other prototype devices suggests that the noise performance is limited by generation-recombination noise. Finally, we find that the detectors are sufficiently sensitive for ground-based spectroscopy at R = 100, appropriate for tomographic mapping experiments. Further modifications are required to reach the background limit for R = 400, ideal for spectroscopy of individual galaxies.

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: Society of Photo-optical Instrumentation Engineers
ISSN: 0277-786X
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Last Modified: 12 Sep 2023 12:01

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