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arXiv · 2406.11300

Chiral Dichroism in Resonant Metasurfaces with Monoclinic Lattices

Ivan Toftul·Pavel Tonkaev·Kirill Koshelev·Fangxing Lai·Qinghai Song·Maxim Gorkunov·Yuri Kivshar
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Abstract

We demonstrate that chiral response can be achieved in resonant metasurfaces with a monoclinic lattice symmetry (the so-called Bravais oblique lattices) where the mirror symmetry is broken by the lattice asymmetry and also by a substrate, whereas each individual meta-atom remains fully achiral. We describe the underlying physics by introducing a mode chirality parameter as a quantitative measure of the lattice chiral eigenmodes. We confirm experimentally selective linear and nonlinear chiral interaction of resonant silicon metasurfaces with circularly polarized light.

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Ivan Toftul, Pavel Tonkaev, Kirill Koshelev, Fangxing Lai, Qinghai Song, Maxim Gorkunov, Yuri Kivshar. 2024-06-17. Chiral Dichroism in Resonant Metasurfaces with Monoclinic Lattices. https://doi.org/10.1103/physrevlett.133.216901

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