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SuperSpec: the on-chip spectrometer: characterization of a full 300 channel filterbank (Conference Presentation)

Wheeler, Jordan D. and Hailey-Dunsheath, Steven and Shirokoff, Erik and Barry, Peter S. and Bradford, Charles M. and Chapman, Scott and Che, George and Doyle, Simon and Glenn, Jason and Gordon, Samuel and Hollister, Matthew and Kovacs, Attila and LeDuc, Henry G. and Mauskopf, Philip and McGeehan, Ryan and McKenney, Christopher and Reck, Theodore and Redford, Joseph and Ross, Colin and Shiu, Corwin and Tucker, Carole and Turner, Jordan and Zmuidzinas, Jonas (2018) SuperSpec: the on-chip spectrometer: characterization of a full 300 channel filterbank (Conference Presentation). In: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX. Proceedings of SPIE. No.10708. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 107080P. ISBN 9781510619692.

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SuperSpec is a new technology for millimeter and submillimeter spectroscopy. It is an on-chip spectrometer being developed for multi-object, moderate resolution (R = ~300), large bandwidth survey spectroscopy of high-redshift galaxies for the 1 mm atmospheric window. SuperSpec targets the CO ladder in the redshift range of z = 0 to 4, the [CII] 158 um line from z = 5 to 9, and the [NII] 205 um line from z = 4-7. All together these lines offer complete redshift coverage from z = 0 to 9. SuperSpec employs a novel architecture in which detectors are coupled to a series of resonant filters along a single microwave feedline instead of using dispersive optics. This construction allows for the creation of a full spectrometer occupying only 20 cm squared of silicon, a reduction in size of several orders of magnitude when compared to standard grating spectrometers. This small profile enables the production of future multi-object spectroscopic instruments required as the millimeter-wave spectroscopy field matures. SuperSpec uses a lens-coupled antenna to deliver astrophysical radiation to a microstrip transmission line. The radiation then propagates down this transmission line where upon proximity coupled half wavelength microstrip resonators pick off specific frequencies of radiation. Careful tuning of the proximity of the resonators to the feedline dials in the desired resolving power of the SuperSpec filterbank by tuning the coupling quality factor. The half wavelength resonators are then in turn coupled to the inductive meander of kinetic inductance detectors (KIDs), which serve as the power detectors for the SuperSpec filterbank. Each SuperSpec filter bank contains hundreds of titanium nitride TiN KIDs and the natural multiplexibility of these detectors allow for readout of the large numbers of required detectors. The unique coupling scheme employed by SuperSpec allows for the creation of incredibly low volume (2.6 cubic microns), high responsivity, TiN KIDs. Since responsivity is proportional to the inverse of quasiparticle-occupied volume, this allows SuperSpec to reach the low NEPs required by moderate resolution spectroscopy to be photon limited from the best ground-based observing sites. We will present the latest results from SuperSpec devices. In particular, detector NEPs, measured filter bank efficiency (including transmission line losses), and spectral profiles for a full ~ 300-channel filterbank. Finally, we will report on our system end to end efficiency and total system NEP.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Wheeler, Jordan D.0000-0003-1678-5570
Hailey-Dunsheath, Steven0000-0002-8504-7988
Bradford, Charles M.0000-0001-5261-7094
Glenn, Jason0000-0001-7527-2017
Mauskopf, Philip0000-0001-6397-5516
McGeehan, Ryan0000-0001-5306-8285
McKenney, Christopher0000-0003-4917-4872
Reck, Theodore0000-0003-1425-0177
Additional Information:© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE).
Group:Astronomy Department
Series Name:Proceedings of SPIE
Issue or Number:10708
Record Number:CaltechAUTHORS:20190823-134014172
Persistent URL:
Official Citation:Jordan D. Wheeler, Steve Hailey-Dunsheath, Erik Shirokoff, Peter S. Barry, Charles M. Bradford, Scott Chapman, George Che, Simon Doyle, Jason Glenn, Sam Gordon, Matthew Hollister, Atilla Kovacs, Henry G. Leduc, Philip Mauskopf, Ryan McGeehan, Christopher McKenney, Theodore Reck, Joeseph Redford, Colin Ross, Corwin Shiu, Carole Tucker, Jordan Turner, and Jonas Zmuidzinas "SuperSpec: the on-chip spectrometer: characterization of a full 300 channel filterbank (Conference Presentation)", Proc. SPIE 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX, 107080P (10 July 2018);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98190
Deposited By: George Porter
Deposited On:23 Aug 2019 22:33
Last Modified:16 Nov 2021 17:37

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