Optical metasurfaces, i.e. arrays of nanoantennas with sub-wavelength size and separation, enable the manipulation of light-matter interactions in miniaturized optical components with no classical counterparts. Six decades after the first ob-servation of the second harmonic generation (SHG) in bulk crystals, these devices are expected to break new ground in the field of nonlinear optics, shifting the focus from the phase matching approach achieved within long propagation dis-tances to that of near-field resonances interplay in leaky nanocavities. Here we review the recent progress in SHG with all-dielectric metasurfaces. We discuss the most used technological platforms which underpinned such advances and analyze different SHG control approaches. We finally compare their performances with other well-established technolo-gies, with the hope to delineate the current state-of-the-art and figure out a few scenarios in which these devices might soon offer unprecedented opportunities.

Carlo Gigli;Giuseppe Leo

Laboratoire MPQ,Universitéde Paris and CNRS,10 rue A.Domon et L.Duquet,Paris 75013,France

光电进展（英文版）

[1]Carlo Gigli;Giuseppe Leo-.All-dielectric χ(2) metasurfaces: recent progress)[J].光电进展（英文版）,2022(07):18-31

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