Ring current can be generated by coupling molecules with circularly polarized optical cavity mode. By embedding the Faraday rotator in a Fabry–Perot cavity, we can create regions in the cavity where thin layers are sorely subjected to the left or right circularly polarized cavity mode, thus create a chiral optical cavity. By placing Mg-porphyrin molecules in this cavity, time reversal symmetry is broken, and polariton ring currents can be generated with linearly polarized light pulse, resulting in a circular dichroism signal. Since the electronic state degeneracy in the molecule is lifted by the formation of chiral polaritons, this signal is one order of magnitude stronger than the bare molecule signal induced by circularly polarized light. Enantiomer-selective photochemical processes in chiral optical cavities is an intriguing future possibility.

Polariton ring currents and circular dichroism of Mg-porphyrin in a chiral cavity

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