Filter-bank for broadband sub-mm wave superconducting on-chip spectrometers

Alejandro Pascual Laguna; Kenichi Karatsu; Juan Bueno; Shahab O. Dabironezare; David J. Thoen; Vignesh Murugesan; Akira Endo; Jochem J. A. Baselmans

doi:10.1117/12.2560483

13 December 2020 Filter-bank for broadband sub-mm wave superconducting on-chip spectrometers

Alejandro Pascual Laguna, Kenichi Karatsu, Juan Bueno, Shahab O. Dabironezare, David J. Thoen, Vignesh Murugesan, Akira Endo, Jochem J. A. Baselmans

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Proceedings Volume 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X; 114530D (2020) https://doi.org/10.1117/12.2560483
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

DESHIMA 2.0 is a broadband sub-mm wave superconducting on-chip spectrometer for astronomy, targeting an instantaneous octave bandwidth (220 - 440 GHz) sampled with moderate spectral resolution channels (f/df ~ 500). In this work we propose a microstrip filter-bank implementation for DESHIMA 2.0 based on “H-shaped” resonators. These bandpass filters are free from spurious resonances over an octave bandwidth, do not suffer from radiation losses and can be arrayed in large filter-banks thanks to their extremely low reflections off-resonance. The design has been aided by an analytical circuit model that can fast and reliably predict the filter-bank behaviour. Prototype chips have been characterised in terms of frequency response and coupling efficiency.

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Alejandro Pascual Laguna, Kenichi Karatsu, Juan Bueno, Shahab O. Dabironezare, David J. Thoen, Vignesh Murugesan, Akira Endo, and Jochem J. A. Baselmans "Filter-bank for broadband sub-mm wave superconducting on-chip spectrometers", Proc. SPIE 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, 114530D (13 December 2020); https://doi.org/10.1117/12.2560483

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KEYWORDS

Optical filters

Spectrometers

Superconductors

Bandpass filters

Antennas

Spectral resolution

Spectroscopy

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