Optical measurements of superspec: a millimeter-wave on-chip spectrometer

Hailey-Dunsheath, S., Barry, P. S., Bradford, C. M., Chattopadhyay, G., Day, P., Doyle, S., Hollister, M., Kovacs, A., LeDuc, H. G., Llombart, N., Mauskopf, P., McKenney, C., Monroe, R., Nguyen, H. T., O'Brient, R., Padin, S., Reck, T., Shirokoff, E., Swenson, L., Tucker, C. E. and Zmuidzinas, J. 2014. Optical measurements of superspec: a millimeter-wave on-chip spectrometer. Journal of Low Temperature Physics 176 (5-6) , 841–847. 10.1007/s10909-013-1068-2

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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.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Springer
ISSN:	0022-2291
Date of Acceptance:	23 December 2013
Last Modified:	12 May 2023 16:00
URI:	https://orca.cardiff.ac.uk/id/eprint/155719

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