Nonlinear Chiral Metasurfaces Based on Structured van der Waals Materials.
basic_science · Level V
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- Record sourced from PubMed, PMID 39150721.
- Also identified by DOI 10.1021/acs.nanolett.4c02765.
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Abstract
Nonlinear chiral photonics explores the nonlinear response of chiral structures, and it offers a pathway to novel optical functionalities not accessible through linear or achiral systems. Here we present the first application of nanostructured van der Waals materials to nonlinear chiral photonics. We demonstrate the 3 orders of magnitude enhancement of the third-harmonic generation from hBN metasurfaces driven by quasi-bound states in the continuum and accompanied by strong nonlinear circular dichroism at the resonances. This novel platform for chiral metaphotonics can be employed for achieving large circular dichroism combined with high-efficiency harmonic generation in a broad frequency range.