Metalens for polarization-switchable multi-functions multiplexing in multiple channels
Metasurface provide a new platform for studying planar and ultrathin optical components.The traditional geometric-phase-based metalens are limited to the polarization locking,which inevitably hinders its function in multi-plexing of multiple functions.Herein,an approach based on the geometric phase is proposed to realize polarization de-coupling of metalens.This method can be applied to design metalens that enables functionalities of polarization switch-able multi-functions(focusing and vortex beam etc...)multiplexing in the longitudinal direction or both the longitudi-nal and transverse directions.The results provide a new avenue for multifunctional integrated planar components.
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