Metasurface-based scalar vortex phase mask in pursuit of 1e-10 contrast

Lorenzo König; Skyler Palatnick; Niyati Desai; Olivier Absil; Maxwell Millar-Blanchaer; Dimitri Mawet

doi:10.1117/12.2676174

5 October 2023 Metasurface-based scalar vortex phase mask in pursuit of 1e-10 contrast

Lorenzo König, Skyler Palatnick, Niyati Desai, Olivier Absil, Maxwell Millar-Blanchaer, Dimitri Mawet

Proceedings Volume 12680, Techniques and Instrumentation for Detection of Exoplanets XI; 126800Q (2023) https://doi.org/10.1117/12.2676174
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

Imaging Earth-like planets around sun-like stars has become one of the main science drivers for future space telescope missions. High-contrast imaging using a vortex coronagraph has proven to be a promising approach for achieving this goal. However, at the huge contrast levels required for future space-based telescopes the vectorial nature of the well-established vector vortex phase mask becomes a limiting factor, since it imprints phase ramps of opposite signs on the two circular polarizations. An alternative polarization-independent approach is using a scalar vortex phase mask, which affects both polarizations in the same way. The achromatic performance of scalar vortex phase masks for space-based applications has still to be improved, though. Metasurfaces provide a promising approach to implement a scalar vortex phase mask with relatively simple fabrication techniques. Their demonstrated ability to implement broadband phase and amplitude masks makes them a prime candidate for achieving achromatic performance in pursuit of the 10⁻¹⁰ contrast limit required by NASA’s Habitable Worlds Observatory. We present a metasurface-based design of a scalar vortex phase mask providing a helical phase ramp across a large bandwidth. We first use rigorous coupled-wave analysis to create a library of square metasurface building blocks (nanoblocks) and choose an optimal set of nanoblock sizes providing broadband 2π phase coverage at a given nanoblock height. We then arrange the nanoblocks in a design providing a helical phase ramp and propagate the phase and transmission provided by the mask through a wavefront propagation software to obtain contrast curves at several wavelengths. Finally we apply electric field conjugation to dig a half-sided dark hole from 3-10 λ/D reaching 3.7 × 10⁻⁹ contrast in 20% bandwidth.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Lorenzo König, Skyler Palatnick, Niyati Desai, Olivier Absil, Maxwell Millar-Blanchaer, and Dimitri Mawet "Metasurface-based scalar vortex phase mask in pursuit of 1e-10 contrast", Proc. SPIE 12680, Techniques and Instrumentation for Detection of Exoplanets XI, 126800Q (5 October 2023); https://doi.org/10.1117/12.2676174

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