Journal
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Volume 11, Issue 6, Pages 635-646Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2021.3095429
Keywords
Astronomy; band-pass filter; DESHIMA; filter-bank; microwave kinetic inductance detector (MKID); on-chip; spectrometer; superconducting; terahertz (THz); wideband
Funding
- European Research Council [648135]
- Netherlands Organization for Scientific Research NWO under Vidi grant [639.042.423]
- European Research Council (ERC) [648135] Funding Source: European Research Council (ERC)
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A superconducting microstrip half-wavelength resonator is proposed as a suitable band-pass filter for broadband moderate spectral resolution spectroscopy for terahertz astronomy. The filter geometry has a free spectral range of an octave of bandwidth and high coupling efficiency. A spectrally sparse prototype filter-bank has been developed in the band 300-400 GHz, with an equivalent circuit model to anticipate systematic errors. The fabricated chip has been characterized in terms of frequency response, showing an average peak coupling efficiency of 27% with an average spectral resolution of 940.
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.
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