Polarization singularities and optical chirality in metasurfaces

Lucio C. Andreani; Dario Gerace; Marco Liscidini; Momchil Minkov; Simone Zanotti

doi:10.1117/12.2666552

31 May 2023 Polarization singularities and optical chirality in metasurfaces

Lucio C. Andreani, Dario Gerace, Marco Liscidini, Momchil Minkov, Simone Zanotti

Proceedings Volume PC12575, Integrated Optics: Design, Devices, Systems and Applications VII; PC1257507 (2023) https://doi.org/10.1117/12.2666552
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

The relation between polarization singularities and optical properties in metasurfaces is a hot topic in nanophotonics. In this work, we focus on dielectric metasurfaces supporting nondegenerate photonic bands, leading to symmetry-protected Bound States in a Continuum (BICs) that become Circularly Polarized States (CPS) upon symmetry reduction. First, we discuss how BICs and CPS lead to polarization singularities in the far field, whose winding numbers – or topological charges – follows from the symmetry of the lattice. Then, we determine the polarization properties via the Stokes parameters, focusing on the conditions for the occurrence of a nonvanishing circular polarization. Finally, we calculate the optical response in reflection and the degree of circular dichroism. The results shed light on the role of polarization singularities and symmetry in determining the optical chirality.

Conference Presentation

Citation Download Citation

Lucio C. Andreani, Dario Gerace, Marco Liscidini, Momchil Minkov, and Simone Zanotti "Polarization singularities and optical chirality in metasurfaces", Proc. SPIE PC12575, Integrated Optics: Design, Devices, Systems and Applications VII, PC1257507 (31 May 2023); https://doi.org/10.1117/12.2666552

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KEYWORDS

Dielectric polarization

Singular optics

Dichroic materials

Dielectrics

Nanophotonics

Optical properties

Photon polarization

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