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Astrophysics > Instrumentation and Methods for Astrophysics

arXiv:2406.19028 (astro-ph)
[Submitted on 27 Jun 2024]

Title:Black Silicon BRDF and Polarization for Coronagraphic Pupil Masks

Authors:Emory L. Jenkins, Ramya M. Anche, Kyle J. Van Gorkom, A. J. Eldorado Riggs, Ewan S. Douglas
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Abstract:Future space observatories will likely have segmented primaries, causing diffraction effects that reduce coronagraph performance. Reflective binary pupil apodizer masks can mitigate these, with the metamaterial black silicon (BSi) showing promise as a strong absorber. To bring contrast ratios to the $10^-{10}$ level as needed to observe Earth-like exoplanets, feature sizes on these BSi masks will need to be less than $5$ microns when paired with MEMS (micro-electromechanical systems) deformable mirrors. As scalar diffraction cannot reliably model this feature size, we developed a Finite-Difference Time-Domain (FDTD) model of BSi masks using Meep software. We characterize the FDTD-derived polarization-dependent bidirectional reflectance distribution function of BSi and discuss the model's shortcomings.
Comments: 8 pages, 10 figures, submitted to SPIE Astronomical Telescopes and Instrumentation (AS24)
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM)
Cite as: arXiv:2406.19028 [astro-ph.IM]
  (or arXiv:2406.19028v1 [astro-ph.IM] for this version)
  https://doi.org/10.48550/arXiv.2406.19028

Submission history

From: Emory Jenkins [view email]
[v1] Thu, 27 Jun 2024 09:28:24 UTC (4,998 KB)
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