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Switchable cross-polarization conversion in ultrathin metasurfaces

An actively switchable cross-polarization conversion is realized in an ultrathin metasurface consisting of periodic arrays of 30 nm thick meta-molecules covered with a 50 nm thick vanadium dioxide layer. A cross-polarization conversion ratio of 45% is obtained for 45° linearly polarized light. A complete switching off of the cross-polarization conversion is achieved based on the insulator-to-metal phase transition of vanadium dioxide induced by increasing temperature. This may pave a way for the realization of multifunctional integrated photonic circuits and quantum solid chips based on metasurfaces.