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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