19 August 2014 Status of SuperSpec: a broadband, on-chip millimeter-wave spectrometer
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SuperSpec is a novel on-chip spectrometer we are developing for multi-object, moderate resolution (R = 100 − 500), large bandwidth (~1.65:1) submillimeter and millimeter survey spectroscopy of high-redshift galaxies. The spectrometer employs a filter bank architecture, and consists of a series of half-wave resonators formed by lithographically-patterned superconducting transmission lines. The signal power admitted by each resonator is detected by a lumped element titanium nitride (TiN) kinetic inductance detector (KID) operating at 100 – 200 MHz. We have tested a new prototype device that is more sensitive than previous devices, and easier to fabricate. We present a characterization of a representative R = 282 channel at f = 236 GHz, including measurements of the spectrometer detection efficiency, the detector responsivity over a large range of optical loading, and the full system optical efficiency. We outline future improvements to the current system that we expect will enable construction of a photon-noise-limited R = 100 filter bank, appropriate for a line intensity mapping experiment targeting the [CII] 158 μm transition during the Epoch of Reionization.
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S. Hailey-Dunsheath, S. Hailey-Dunsheath, E. Shirokoff, E. Shirokoff, P. S. Barry, P. S. Barry, C. M. Bradford, C. M. Bradford, G. Chattopadhyay, G. Chattopadhyay, P. Day, P. Day, S. Doyle, S. Doyle, M. Hollister, M. Hollister, A. Kovacs, A. Kovacs, H. G. LeDuc, H. G. LeDuc, P. Mauskopf, P. Mauskopf, C. M. McKenney, C. M. McKenney, R. Monroe, R. Monroe, R. O'Brient, R. O'Brient, S. Padin, S. Padin, T. Reck, T. Reck, L. Swenson, L. Swenson, C. E. Tucker, C. E. Tucker, J. Zmuidzinas, J. Zmuidzinas, } "Status of SuperSpec: a broadband, on-chip millimeter-wave spectrometer", Proc. SPIE 9153, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII, 91530M (19 August 2014); doi: 10.1117/12.2057229; https://doi.org/10.1117/12.2057229

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