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arXiv · 2512.23393

Electro-optical modulation of light polarization in a nonlocal lithium niobate metasurface

Agostino Di Francescantonio·Alessandra Sabatti·Eleni Prountzou·Maria Antonietta Vincenti·Luca Carletti·Attilio Zilli·Michele Celebrano·Rachel Grange·Marco Finazzi
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Abstract

We report the experimental realization of a LiNbO3 metasurface for electro-optic modulation of light polarization in the telecommunication band. High-Q quasi-bound states in the continuum are emploied to enhance the modulation of amplitude and phase of an impinging beam by a driving electric field, leading to efficient polarization rotation and conversion. We quantified modulation effects under a CMOS-compatible bias at 1 MHz frequency, achieving a variation of 5% in the Stokes parameters and a variation of the polarization ellipse angles of about 3{\deg} for the transmitted light. These results demonstrate that dynamic polarization and phase modulation can be attained in a compact platform, highlighting the potential of high-Q resonant LiNbO3 metasurfaces for enhanced light-matter interaction in subwavelength electro-optic devices.

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Agostino Di Francescantonio, Alessandra Sabatti, Eleni Prountzou, Maria Antonietta Vincenti, Luca Carletti, Attilio Zilli, Michele Celebrano, Rachel Grange, Marco Finazzi. 2025-12-29. Electro-optical modulation of light polarization in a nonlocal lithium niobate metasurface. https://arxiv.org/abs/2512.23393

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