Chiral Response in Red Light Band Based on Single-layer Dielectric Metasurface

Abstract Metasurfaces with chiral responses are widely used in optics.To achieve a strong chiral response most metasurface structures typically use two or more stacked layers of subwavelength structures with rotation or offset.However the requirement for highly precise alignment increases the manufacturing difficulty and cost.This work introduces a single-layer dielectric metasurface with an intrinsic chiral response operating in the red light band.It has a circular dichroism transmittance of 0. 643 at 665 nm.Multipole decomposition analysis reveals that the several dipoles dominate the Mie resonance affecting the light scattering behavior.By analyzing the locally enhanced electric field distribution it is revealed that the metasurface employs a C 2 -symmetric structure to regulate constructive and destructive interference enabling selective transmission of circularly polarized light.These findings could expand the application of chiral dielectric metasurfaces in optical encryption displays and biological sensing. Key words dielectric