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Multifunctional non-Hermitian metasurface: metalens and holograms
Abstract:
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 (VO2). As an example in applications, the phase-only metalens and dual-channel holograms can be realized and switched by changing states of the VO2 and incident light polarization. This work will open a prospect for researching a multifunctional non-Hermitian metasurface and the design of switchable multifunctional nano-photonic devices.
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