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We conceptualized three-array scalable metasurfaces comprising only threethin strip grids and numerically demonstrated their characteristics in themid-infrared spectral regime for switchable polarization manipulation andrelated asymmetric diodelike transmission (AT). A few or all of the grids weretaken to be made of VO$_2$, a phase-change material. For each proposedmetasurface, two effective structures and, therefore, two differentfunctionalities exist, corresponding to the metallic and insulating phases ofVO$_2$. The achieved scenarios of functionality switching that depend on theVO$_2$ phase are shown to significantly depend in the way in which VO$_2$ isincorporated to the metasurface. Switchable bands of polarization manipulationare up to 40 THz wide. The AT band can be modulated when Fabry--Perot(anti-)resonances come into play.

Thermally switchable polarization manipulation and diodelike  transmission in scalable, resonator-free, mid-infrared metasurfaces with  vanadium-dioxide grids