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 language | English (US) |
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Pages (from-to) | 841-847 |
Number of pages | 7 |
Journal | Journal of Low Temperature Physics |
Volume | 176 |
Issue number | 5-6 |
DOIs | |
State | Published - 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