We report on the active control of transmissive polarization switching of near infrared light in two dimensions (2D) using liquid crystal (LC) infiltrated Ti3O5 nanostructures with > 50% efficiency in experiment. Our device consists of a periodic array of elliptical Ti3O5 pillars submerged in a thin (~ 2 um) LC layer and supports overlapping electric and magnetic dipoles under linearly polarized incidence. Using a biased photoactive top contact, we manipulate light in 2D by patterning a 435 nm pump laser on its surface to locally modulate LCs in illuminated areas. This work can find applications in solid-state programmable beam shaping and steering.
In the present talk, we discuss strategies to design both plasmonic and all-dielectric active metasurfaces, which can dynamically manipulate the wavefront of the transmitted light in the near-infrared wavelength range. Our active transmissive metasurfaces feature an array of amorphous silicon (a-Si) pillars on a silica (SiO2) substate, which, in some cases, are hybridized with a thin metallic layer. The optical response of the designed metasurface is either tuned thermo-optically or by integrating active materials such as lithium niobate (LNO), indium tin oxide (ITO), or tungsten disulfide (WS2) into the metasurface structure.
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