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

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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 300400 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.

Original languageEnglish
Pages (from-to)635-646
Number of pages12
JournalIEEE Transactions on Terahertz Science and Technology
Volume11
Issue number6
DOIs
Publication statusPublished - 2021

Keywords

  • Astronomy
  • band-pass filter
  • Couplings
  • DESHIMA
  • Filter banks
  • filterbank
  • Microstrip filters
  • Microwave filters
  • microwave kinetic inductance detector (MKID)
  • on-chip
  • Resonator filters
  • Resonators
  • spectrometer
  • superconducting
  • Superconducting filters
  • terahertz (THz)
  • wideband

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