SuperSpec: development towards a full-scale filter bank
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Abstract
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.
Additional Information
© 2016 SPIE. Society of Photo-Optical Instrumentation Engineers (SPIE). This work is supported in part by NASA Space Technology Research Fellowship NSTRF NNX15AQ09H and NSF AST ATI grant 1407457.Attached Files
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Identifiers
- Eprint ID
- 72035
- Resolver ID
- CaltechAUTHORS:20161115-131427717
Related works
Funding
- NASA Space Technology Research Fellowship
- NNX15AQ09H
- NSF
- AST-1407457
Dates
- Created
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2016-11-15Created from EPrint's datestamp field
- Updated
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2023-03-16Created from EPrint's last_modified field
Caltech Custom Metadata
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 9914