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SuperSpec, the on-chip spectrometer: improved NEP and antenna performance

Wheeler, Jordan, Hailey-Dunsheath, S., Shirokoff, E., Barry, Peter, Bradford, C. M., Chapman, S., Che, G., Doyle, Simon, Glenn, J., Gordon, S., Hollister, M., Kovács, A., LeDuc, H. G., Mauskopf, Phil, McGeehan, R., McKenney, C., Reck, T., Redford, J., Ross, C., Shiu, C., Tucker, C., Turner, J., Walke, S. and Zmuidzinas, J. 2018. SuperSpec, the on-chip spectrometer: improved NEP and antenna performance. Journal of Low Temperature Physics 193 (3-4) , pp. 408-414. 10.1007/s10909-018-1926-z

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Abstract

SuperSpec is a new technology for mm and sub-mm spectroscopy. It is an on-chip spectrometer being developed for multi-object, moderate-resolution ( R∼300 ), large bandwidth survey spectroscopy of high-redshift galaxies for the 1 mm atmospheric window. This band accesses the CO ladder in the redshift range of z= 0–4 and the [CII] 158 μ m line from redshift z= 5–9. SuperSpec employs a novel architecture in which detectors are coupled to a series of resonant filters along a single microwave feedline instead of using dispersive optics. This construction allows for the creation of a full spectrometer occupying only ∼10cm2 of silicon, a reduction in size of several orders of magnitude when compared to standard grating spectrometers. This small profile enables the production of future multi-beam spectroscopic instruments envisioned for the millimeter band to measure the redshifts of dusty galaxies efficiently. The SuperSpec collaboration is currently pushing toward the deployment of a SuperSpec demonstration instrument in fall of 2018. The progress with the latest SuperSpec prototype devices is presented; reporting increased responsivity via a reduced inductor volume (2.6 μm3 ) and the incorporation of a new broadband antenna. A detector NEP of 3–4 ×10−18 W/Hz 0.5 is obtained, sufficient for background-limited observation on mountaintop sites. In addition, beam maps and efficiency measurements of a new wide-band dual bow-tie slot antenna are shown.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Publisher: Springer Verlag (Germany)
ISSN: 0022-2291
Date of Acceptance: 16 April 2018
Last Modified: 29 May 2019 23:34
URI: http://orca-mwe.cf.ac.uk/id/eprint/113443

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