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Dual-wavelength chiral metasurfaces based on quasi-bound states in the continuum
- Source :
- Journal of Optics. 25:045001
- Publication Year :
- 2023
- Publisher :
- IOP Publishing, 2023.
-
Abstract
- In this paper, we numerically demonstrate a dual-wavelength chiral metasurface with the chirality only existing at two resonant wavelengths, making use of the excitation of two quasi-bound states in the continuum (quasi-BICs). This chiral metasurface is constructed on the basis of photonic crystal slabs with square lattice of circular holes by introducing rectangular holes as perturbations. The two quasi-BICs supported by chiral metasurface are orthogonal to each other, thus the chirality at the two resonant wavelengths can be controlled independently by changing the geometry of the perturbations. Furthermore, a chirality-switchable metasurface is demonstrated taking advantage of the sensitivity of quasi-BICs to the variation of out-of-plane symmetry caused by changing refractive index of surroundings. The proposed chiral metasurface could find potential applications in nonlinear optics, sensing, imaging and near-to-eye displays.
Details
- ISSN :
- 20408986 and 20408978
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Journal of Optics
- Accession number :
- edsair.doi...........656054dfa92f10c1466a1d5dba692a52