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Chirality, either of light or matter, has proved to be very practical inbiosensing and nanophotonics. However, the fundamental understanding of itstemporal dynamics still needs to be discovered. A realistic setup for this arethe so-called metastructures, since they are optically active and are builtmassively, hence rendering an immediate potential candidate. Here we proposeand study the electromagnetic-optical mechanism leading to chiral opticalimprinting on metastructures. Induced photothermal responses create anisotropicpermittivity modulations, different for left or right circularly polarizedlight, leading to temporal-dependent chiral imprinting of hot-spots, namelyimprinting of chirality. The above effect has not been observed yet, but it iswithin reach of modern experimental approaches. The proposed nonlinearchiroptical effect is general and should appear in any anisotropic material;however, we need to design a particular geometry for this effect to be strong.These new chiral time-dependent metastructures may lead to a plethora ofapplications.

Universal imprinting of chirality with chiral light by employing plasmonic metastructures