Lithium Niobate Meta-Optics

The rapid development of optical metasurfaces, 2D ensembles engineered nanostructures, is presently underpinning a steady drive toward the miniaturization many functionalities and devices. list material platforms for metasurfaces rapidly expanding as, over past few years, we have witnessed surge in establishing meta-optical elements from high-index, highly transparent materials with strong nonlinear electro-optic properties. In particular, crystalline lithium niobate (LiNbO3), already prime integrated photonics, has shown great promise novel components, thanks to its large electro-optical coefficient second-order response broad transparency window ranging visible mid-infrared. Recent advances nanofabrication technology indeed marked new milestone LiNbO3 platforms, hence enabling first demonstrations LiNbO3-based metasurfaces. These seminal works set steppingstone realization ultrathin monolithic light sources, efficient quantum sources correlated photon pairs, as well modulators. Here, review these recent by providing perspective on their potential applications examining possible setbacks limitations emerging technologies.