A vacuum waveguide filter bank spectrometer for far-infrared astrophysics

Nie, Rong, Filippini, Jeffrey, Brooks, Elyssa, Barry, Peter, Connors, Jake, Gradziel, Marcin, Mercado, Dale, Razavimaleki, Vesal, Shirokoff, Erik, Spencer, Locke, Tramm, Serena, Trappe, Neil and Zemcov, Michael 2024. A vacuum waveguide filter bank spectrometer for far-infrared astrophysics. Journal of Low Temperature Physics 10.1007/s10909-024-03166-2

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Abstract

Traditional technologies for far-infrared (FIR) spectroscopy generally involve bulky dispersive optics. Integrated filter bank spectrometers promise more compact designs, but implementations using superconducting transmission line networks become lossy at terahertz frequencies. We describe a novel on-chip spectrometer architecture designed to extend this range. A filter bank spectrometer is implemented using vacuum waveguide etched into a silicon wafer stack. A single trunk line feeds an array of resonant cavities, each coupled to a kinetic inductance detector fabricated on an adjacent wafer. We discuss the design and fabrication of a prototype implementation, initial test results at ambient temperature, and prospects for future development.

Item Type:	Article
Date Type:	Published Online
Status:	In Press
Schools:	Physics and Astronomy
Publisher:	Springer
ISSN:	0022-2291
Date of First Compliant Deposit:	5 July 2024
Date of Acceptance:	21 May 2024
Last Modified:	08 Jul 2024 09:15
URI:	https://orca.cardiff.ac.uk/id/eprint/170376

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