Optimization of a Quasi-Mesh Absorber for the Terahertz Intensity Mapper

Creators: Nie, Rong; Janssen, Reinier M. J.; Bradford, Charles M.; Filippini, Jeffrey P.; Hailey-Dunsheath, Steven

Abstract

We discuss the design and optimization of the absorber for the long-wavelength arm of the Terahertz intensity mapper, a balloon-borne spectrometer employing kinetic inductance detectors. Electromagnetic simulations of our design indicate in-band absorption efficiency over ∼80% in both linear polarization modes. By developing custom transmission line model and mode-matching calculations, we find the absorption efficiency is affected by the absorber's reactive part and overall shape. These insights into the operation of this design provide guidance for its optimization for low-resistance absorber materials.

Additional Information

© 2020 IEEE. This work is licensed under a Creative Commons Attribution 4.0 License. Manuscript received June 1, 2020; revised August 11, 2020; accepted August 24, 2020. Date of publication September 4, 2020; date of current version November 3, 2020. This work was carried out as part of the Terahertz Intensity Mapper project, supported by NASA under Grant 80NSSC19K1242, issued through the Science Mission Directorate. The work of Reinier M. J. Janssen was supported by an appointment to the NASA Postdoctoral Program at the NASA Jet Propulsion Laboratory, administered by Universities Space Research Association under contract with NASA. This research was carried out in-part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (80NM0018D0004).

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