One achiral resonant metasurface emits third-harmonic light with continuously tunable handedness (DNC from -0.86 to 0.94) controlled by pump polarization angle, with all-optical switching in ~3.2 fs delay steps.
and Kivshar, Y ., Nonlinear chiral metaphotonics: A Perspective
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Nonlinear chiral light generation from resonant metasurfaces
One achiral resonant metasurface emits third-harmonic light with continuously tunable handedness (DNC from -0.86 to 0.94) controlled by pump polarization angle, with all-optical switching in ~3.2 fs delay steps.