Demonstrates unidirectional light emission with polarization control in nonlinear metasurfaces, indicating advancements in optical applications.
We demonstrated different singularities of nonlinear susceptibilities in the parameter space of twisted bilayer and tetralayer nonlinear metasurfaces, achieved unidirectional emission with full-Poincaré polarization tunability of second harmonic generation in such metasurfaces.
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Zhou et al. (2025) studied this question.
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