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

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.

arXiv comment11 pages, 17 figures

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• Directional Filter Design and Simulation for Superconducting On-chip Filter-banks
• The Simulation and Design of an On-Chip Superconducting Millimetre Filter-Bank Spectrometer
• Optimisation-based alignment of wideband integrated superconducting spectrometers for sub-mm astronomy
• Design of SPT-SLIM focal plane; a spectroscopic imaging array for the South Pole Telescope