Metasurfaces with maximum chirality empowered by bound states in the continuum
Optics
2020-08-28 v1 Applied Physics
Abstract
We demonstrate that rotationally symmetric chiral metasurfaces can support arbitrarily sharp resonances with the maximum optical chirality determined by precise shaping of bound states in the continuum (BICs). Being uncoupled from one circular polarisation of light and resonantly coupled to its counterpart, a metasurface hosting the chiral BIC resonance exhibits a narrow peak in the circular dichroism spectrum. We propose a realization of such chiral BIC metasurfaces based on pairs of dielectric bars and validate the concept of maximum chirality by numerical simulations
Keywords
Cite
@article{arxiv.2006.15884,
title = {Metasurfaces with maximum chirality empowered by bound states in the continuum},
author = {Maxim V. Gorkunov and Alexander A. Antonov and Yuri S. Kivshar},
journal= {arXiv preprint arXiv:2006.15884},
year = {2020}
}