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Parallel polarization state generation and measurement with a single metasurface (Conference Presentation)
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Paper Abstract

In polarimetry, that is, a measurement of the four-component polarization Stokes vector, a measurement must either consist of four (or more) sequential intensity measurements, sacrificing time resolution, or contain four separate light paths each with separate polarization optics, increasing bulk, cost, and system complexity. Similar issues present difficulty across polarization optics technology. Metasurfaces, nanophotonic arrays of phase shifting elements, have emerged as a novel platform for polarization optics. These individual phase shifters can be designed with a characteristic anisotropy, and are thus imbued with tunable shape birefringence. A metasurface, then, can function as a subwavelength spaced array of nanoscale waveplates. I will describe how, through relatively simple optimization methods, a metasurface producing arbitrarily specified polarization states (when illuminated with light of a known polarization) can be designed. This functionality is equivalent to a traditional diffraction grating with individual waveplate optics on each order; here, all the necessary polarization optics can be integrated into a flat, ultrathin optical element. Moreover, such a metasurface can be used in a reverse configuration as a parallel snapshot polarimeter with no need for additional polarization optics (save for a single polarizer). I present a detailed experimental characterization of both concepts in the visible spectral region and a comparison of the performance of the metasurface to a commercially available rotating waveplate polarimeter. With no bulk birefringent crystal optics, a parallel, full-polarization state measurement can be made with an integrated, scalable, and inexpensive device. Given its diffractive nature, the design naturally extends to spectropolarimetry and polarization imaging.

Paper Details

Date Published: 8 March 2019
Proc. SPIE 10928, High Contrast Metastructures VIII, 109280G (8 March 2019); doi: 10.1117/12.2511205
Show Author Affiliations
Noah A. Rubin, Harvard John A. Paulson School of Engineering and Applied Sciences (United States)
Aun Zaidi, Harvard College (United States)
Massachusetts Institute of Technology (United States)
Michael Juhl, Innovation Ctr. Iceland (Iceland)
Ruoping Li, Univ. of Waterloo (Canada)
Yale Univ. (United States)
Balthasar Mueller, Innovation Ctr. Iceland (Iceland)
Robert C. Devlin, Harvard John A. Paulson School of Engineering and Applied Sciences (United States)
Kristján Leósson, Innovation Ctr. Iceland (Iceland)
Federico Capasso, Harvard John A. Paulson School of Engineering and Applied Sciences (United States)

Published in SPIE Proceedings Vol. 10928:
High Contrast Metastructures VIII
Connie J. Chang-Hasnain; Andrei Faraon; Weimin Zhou, Editor(s)

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