Superchiral Light Emerging from Bound States in the Continuum in Metasurfaces of Si Nanorod Dimers.

ABSTRACT: Bound states in the continuum (BICs) in all-dielectric metasurfaces enhance light-matter interaction at the nanoscale due to their infinite Q factors and strong field confinement. Among a variety of phenomena already reported, their impact on chiral light has recently attracted great interest. Here we investigate the emergence of intrinsic and extrinsic optical chirality associated with the excitation of BICs in various metasurfaces made of Si nanorod dimers on a quartz substrate, comparing three cases: parallel nanorods (neutral) and shifted and slanted dimers, with/without index-matching superstrate. We analyze both the circular dichroism (CD) of the far-field (FF) interaction and the helicity of the near-field (NF) distribution. We show that the best approach to achieve chiral re

SUBMITTER: Pura JL 

PROVIDER: S-EPMC11488143 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature