Chirality is crucial in biological evolution and modern biochemistry, and the demand for techniques to enhance optical chirality in the interaction between circularly polarized light and chiral molecules is increasingly significant. However, most chiral optical effects yield weak signals, and traditional detection methods struggle to achieve high-sensitivity recognition of chiral molecules, thus limiting their applications in biology and medicine. Here, we investigate the influence of three factors on chirality enhancement: the amplification of electric and magnetic fields in hollow silicon nanodisk metasurface structures, and the coefficients determined by the field-component phase. The maximum chirality enhancement occurs in uniformly distributed air holes, due to the synergistic interaction between the electric dipole resonance and anapole modes. This enhancement is mainly governed by the electric dipole mode and stays consistent with variations in air gap dimensions and metasurface parameters. By tuning aperture radius, height, and metasurface array configuration, optical chirality can be precisely controlled, achieving a maximum enhancement factor of up to 120. The Mie resonator optimization strategy proposed in this study offers an innovative approach for designing achiral metasurfaces tailored for chiral manipulation, paving the way for their widespread application in chiral detection and related technological fields.
Jia et al. (2026) studied this question.