Nonlinear metasurfaces are transforming wavefront control at the nanoscale, offering compact platforms for efficient frequency conversion and all-optical processing. In a recent advance, Franceschini et al. demonstrated a powerful method to generate tunable visible light by exploiting nonlinear coupling between two distinct resonances in an amorphous-silicon metasurface, all driven by a single broadband femtosecond pulse.
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Ahmed H. Dorrah (2026) studied this question.
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