Low noise titanium nitride KIDs for SuperSpec: A millimeter-wave on-chip spectrometer

Hailey-Dunsheath, S., Barry, Peter, Mauskopf, Philip ORCID: https://orcid.org/0000-0001-6397-5516 and Tucker, Carole ORCID: https://orcid.org/0000-0002-1851-3918 2016. Low noise titanium nitride KIDs for SuperSpec: A millimeter-wave on-chip spectrometer. Journal of Low Temperature Physics 184 (1-2) , pp. 180-187. 10.1007/s10909-015-1375-x

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Abstract

SuperSpec is a novel on-chip spectrometer we are developing for multi-object, moderate resolution ( R=R= 100–500), large bandwidth ( ∼1.65:1∼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 operating at 100–200 MHz. We have tested a new prototype device that achieves the targeted R=100R=100 resolving power, and has better detector sensitivity and optical efficiency than previous devices. We employ a new method for measuring photon noise using both coherent and thermal sources of radiation to cleanly separate the contributions of shot and wave noise. We report an upper limit to the detector NEP of 1.4×10−171.4×10−17 W Hz −1/2−1/2 , within 10 % of the photon noise-limited NEP for a ground-based R=100R=100 spectrometer.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	Springer Verlag (Germany)
ISSN:	0022-2291
Date of Acceptance:	14 November 2015
Last Modified:	21 Aug 2023 06:20
URI:	https://orca.cardiff.ac.uk/id/eprint/104321

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