Optical measurements of SuperSpec: A millimeter-wave on-chip spectrometer

S. Hailey-Dunsheath, P. S. Barry, C. M. Bradford, G. Chattopadhyay, P. Day, S. Doyle, M. Hollister, A. Kovacs, H. G. Leduc, N. Llombart, Philip Mauskopf, C. McKenney, R. Monroe, H. T. Nguyen, R. O'Brient, S. Padin, T. Reck, E. Shirokoff, L. Swenson, C. E. TuckerJ. Zmuidzinas

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

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∼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 Qfilt = 700, consistent with the designed values plus additional dissipation characterized by Qi ≈ 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 ∼30 dB below the peak response.

Original languageEnglish (US)
Pages (from-to)841-847
Number of pages7
JournalJournal of Low Temperature Physics
Volume176
Issue number5-6
DOIs
StatePublished - Sep 2014

Keywords

  • Kinetic inductance detector
  • Millimeter-wave
  • Spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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