  Based on U-shaped plasmonic nanoholes in an $\ce{Au-VO2-Au}$ film, we propose
to achieve several switchable functions at the telecom wavelength by transition
from the $\ce{VO2}$ semiconductive state to the metallic state. The first is
the polarization manipulation of four different polarization states
($x\&y$-polarization, LCP, and RCP). An array of U-shaped holes constitutes of
the high efficiency SPP splitter, and thus the spin-encoded optical logical
gates can be achieved. Furthurmore, we prove that a nano-optical conveyor belt
can be build up with such U-shaped holes, making the transport of nanoparticles
over the film efficiency by transforming between two spin states periodically,
and the transport direction switchably along with the $\ce{VO2}$ phase.
