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We investigate the interaction between a monolayer of WS2 and a chiralplasmonic metasurface. WS2 possesses valley excitons that selectively couplewith one-handed circularly polarised light. At the same time, the chiralplasmonic metasurface exhibits spin-momentum locking, leading to a robustpolarisation response in the far field. Using a scattering formalism based onthe coupled mode method, we analyse various optical properties of the WS2monolayer. Specifically, we demonstrate the generation of circular dichroism inthe transition metal dichalcogenide (TMD) by harnessing the excitation ofsurface plasmon polaritons (SPPs) in the metasurface. Moreover, we observe theemergence of other guided modes, opening up exciting possibilities for furtherexploration in TMD-based devices.

Circular dichroism induction in WS2 by a chiral plasmonic metasurface