Abstract
SuperSpec is a novel on-chip spectrometer we are developing for (sub)millimeter wavelength astronomy. Our approach utilizes a filterbank of moderate resolution (\(R \sim 500{)}\) channels, coupled to lumped element kinetic inductance detectors (KIDs), all integrated onto a single silicon chip. The channels are half-wave resonators formed by lithographically depositing segments of superconducting transmission line, and the KIDs are titanium nitride resonators. Here we present optical measurements of a first generation prototype, operating in the 180–280 GHz frequency range. We have used a coherent source to measure the spectral profiles of 17 channels, which achieve linewidths corresponding to quality factors as high as \(Q_\mathrm {filt} = 700{,}\) consistent with the designed values plus additional dissipation characterized by \(Q_i \approx 1440{.}\) We have also used a Fourier Transform Spectrometer to characterize the spectral purity of all 72 channels on the chip, and measure typical out of band responses \({\sim }30\) dB below the peak response.
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P.S. Barry et al., in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, vol. 8452 (SPIE, Bellingham, WA, 2012)
G. Cataldo, J.A. Beall, H.-M. Cho, B. McAndrew, M.D. Niemack, E.J. Wollack, Opt. Lett. 37, 4200 (2012)
D.J. Fixsen, E. Dwek, J.C. Mather, C.L. Bennett, R.A. Shafer, ApJ 508, 123 (1998)
A. Kovács et al., in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, vol. 8452 (SPIE, Bellingham, WA, 2012)
A.D. O’Connell et al., Appl. Phys. Lett. 92, 112903 (2008)
E. Shirokoff et al., in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, vol. 8452 (SPIE, Bellingham, WA, 2012)
R. Wang et al., ApJ 773, 44 (2013)
Acknowledgments
This project is supported by NASA Astrophysics Research and Analysis (APRA) Grant No. 399131.02.06.03.43. ES, CMM, and LJS acknowledge support from the W. M. Keck Institute for Space Studies. MIH, LJS, and TR acknowledge support from the NASA Postdoctoral Program. PSB acknowledges the continuing support from the Science and Technology Facilities Council Ph.D studentship programme and grant programmes ST/G002711/1 and ST/J001449/1. Device fabrication was performed the JPL Microdevices Laboratory.
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Hailey-Dunsheath, S., Barry, P.S., Bradford, C.M. et al. Optical Measurements of SuperSpec: A Millimeter-Wave On-Chip Spectrometer. J Low Temp Phys 176, 841–847 (2014). https://doi.org/10.1007/s10909-013-1068-2
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DOI: https://doi.org/10.1007/s10909-013-1068-2