Title: Electrical Tuning of Polarizaion-state Using Graphene-Integrated Metasurfaces,
Abstract: Plasmonic metasurfaces have been employed for tuning and controlling light
enabling various novel applications. Their appeal is enhanced with the
incorporation of an active element with the metasurfaces paving the way for
dynamic control. In this letter, we realize a dynamic polarization state
generator using graphene-integrated anisotropic metasurface (GIAM), where a
linear incidence polarization is controllably converted into an elliptical one.
The anisotropic metasurface leads to an intrinsic polarization conversion when
illuminated with non-orthogonal incident polarization. Additionally, the
single-layer graphene allows us to tune the phase and intensity of the
reflected light on the application of a gate voltage, enabling dynamic
polarization control. The stokes polarization parameters of the reflected light
are measured using rotating polarizer method and it is demonstrated that a
large change in the ellipticity as well as orientation angle can be induced by
this device. We also provide experimental evidence that the titl angle can
change independent of the ellipticity going from positive values to nearly zero
to negative values while ellipticity is constant.