Enabled by designer local field patterns and electromagnetic modes, photonic metasurfaces have provided unprecedented control over light wave propagation. We summarize recent developments in light-matter interactions in the strong-field regime in semiconductor (Si, Ge, GaAs, GaP) metasurfaces. We will discuss high-efficiency optical harmonic generation and ultrafast all-optical switching, with an outlook toward novel optoelectronic devices and material platforms.
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