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In this talk, we present and discuss our recent advances on meta-gratings, in particular their tunability and nonlinearity enabled by their implementation with TMD materials. We have recently shown that gradient metasurfaces suffer from fundamental limits on the overall efficiency of wavefront manipulation. To overcome this issue, we have introduced the concept of meta-gratings, formed by periodic arrays of carefully tailored bianisotropic inclusions. This concept enables wavefront engineering with unitary efficiency and significantly lower fabrication demands both in transmission and reflection. Beyond beam-steering, we have also shown metagratings for focusing and lensing. In this work, we extend these concepts to tunable, highly non-linear and/or non-reciprocal metasurfaces based on TMD materials, exploiting the unusual light-matter interactions enabled by exciton-photon coupling in these materials. We discuss the broad opportunities of this material platform for metasurfaces.
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