Cross-slot metal-mesh bandpass filters for far-infrared astronomy

Joanna Perido; Kevin Denis; Jason Glenn; Nicholas F. Cothard; Manuel Quijada; Jessica Patel; Edward Wollack; Tilak Hewagama; Sahid Aslam; Peter K. Day

doi:10.1117/12.2630571

31 August 2022 Cross-slot metal-mesh bandpass filters for far-infrared astronomy

Joanna Perido, Kevin Denis, Jason Glenn, Nicholas F. Cothard, Manuel Quijada, Jessica Patel, Edward Wollack, Tilak Hewagama, Sahid Aslam, Peter K. Day

Author Affiliations +

Proceedings Volume 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI; 121901M (2022) https://doi.org/10.1117/12.2630571
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The far-infrared (IR) region is rich with information needed to characterize interstellar dust and to investigate the cold outer planets of the solar system and their icy moons. The proposed sub-orbital observatory the balloon experiment for galactic infrared science (BEGINS) will utilize cryogenic instruments to map spectral energy distributions (SEDs) of interstellar dust in the Cygnus molecular cloud complex. A future high priority flagship mission Uranus Orbiter and Probe carrying a net flux radiometer (NFR) will study the in situ heat flux of the icy giants atmosphere to 10 bar pressure. These instruments require far-IR filters to define the instrument spectral bandwidths. Our ultimate goal is to define the instrument bands of BEGINS and the NFR with linear-variable filters (LVFs) and discrete-variable filters (DVFs). The LVFs and DVFs will be made of metal mesh band-pass filters (MMBF) comprised of a 100 nm thick gold film with cross-shaped slots of varying sizes along a silicon (Si) substrate with cyclic olefin copolymer (COC) anti-reflection (AR) coatings. We present our progress towards LVFs and DVFs with simulated and measured transmission of a room temperature, non-AR coated, single-band 44 µm MMBF filter. We have successfully fabricated, measured, and modeled a non-AR coated, room temperature 44 µm MMBF. The transmission at room temperature and non-AR coated was measured to be 27% with a resolving power of 11. When COC-AR coated on both sides the transmission is expected to increase to 69% with a resolving power of ten.

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Joanna Perido, Kevin Denis, Jason Glenn, Nicholas F. Cothard, Manuel Quijada, Jessica Patel, Edward Wollack, Tilak Hewagama, Sahid Aslam, and Peter K. Day "Cross-slot metal-mesh bandpass filters for far-infrared astronomy", Proc. SPIE 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, 121901M (31 August 2022); https://doi.org/10.1117/12.2630571

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