Recent Progress on Plasmonic and Dielectric Chiral Metasurfaces: Fundamentals, Design Strategies, and Implementation

摘要

Over the years, researchers have been exploring ways to artificially designchiral structures and materials, namely metamaterials and metasurfaces.They exhibit unique optical properties that can be used for variousapplications. However, metasurfaces comprise symmetry-breaking structuresthat provide a more convenient solution for planar chiral optics regardless ofwhether they are plasmonic or dielectric. In general, plasmonic chiralmetasurfaces are more suitable for applications requiring a high confinementlevel and substantial optical near-field enhancement. In contrast, dielectricchiral metasurfaces are ideal for wide operating wavelength ranges and lowlosses. This review summarizes the recent progress on plasmonic anddielectric chiral metasurfaces. It includes the fundamental concepts, designstrategies, and their implementation for applications in holographic displays,imaging and sensing, and detection. Moreover, an overview of chiralmetasurfaces to generate the nonlinear effects, hosting bound states in thecontinuum, and the significant role of machine-learning-based designapproaches are also discussed. Finally, some future developments arehighlighted where chiral metasurfaces are expected to play a vital role.