Multifunctional non-Hermitian metasurface: metalens and holograms

Exceptional points (EPs) have been the subject of wide concern because of their unique physical properties and have produced many related applications. However, up to now, most non-Hermitian metasurfaces related to EPs focus on realizing a single function. It remains a challenge to integrate multiple functions into a single non-Hermitian metasurface while making it dynamically adjustable. In this work, we investigated how to combine the Pancharatnam-Berry (PB) phase and exceptional topological (ET) phase and used the polarization decoupling property of EPs to design and realize the integration of multiple functions on a metasurface with the assistance of vanadium dioxide (VO