Terahertz Band-Pass Filters for Wideband Superconducting On-chip Filter-bank Spectrometers

TL;DR

This paper introduces a superconducting microstrip resonator filter for terahertz spectroscopy, achieving high efficiency and spectral resolution, suitable for on-chip spectrometer applications in astronomy.

Contribution

It presents a novel filter design with an octave bandwidth, high rejection, and minimal cross-talk, along with a prototype for broadband THz spectroscopy.

Findings

Average peak coupling efficiency of 27%

Spectral resolution of 940

Effective suppression of spurious resonances

Abstract

A superconducting microstrip half-wavelength resonator is proposed as a suitable band-pass filter for broadband moderate spectral resolution spectroscopy for terahertz (THz) astronomy. The proposed filter geometry has a free spectral range of an octave of bandwidth without introducing spurious resonances, reaches a high coupling efficiency in the pass-band and shows very high rejection in the stop-band to minimize reflections and cross-talk with other filters. A spectrally sparse prototype filter-bank in the band 300-400 GHz has been developed employing these filters as well as an equivalent circuit model to anticipate systematic errors. The fabricated chip has been characterized in terms of frequency response, reporting an average peak coupling efficiency of 27% with an average spectral resolution of 940.