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Pseudospin plays a very important role in understanding various interestingphysical phenomena associated with 2D materials such as graphene. It has beenproposed that pseudospin is directly related to angular momentum, and it wasrecently experimentally demonstrated that orbit angular momentum is anintrinsic property of pseudospin in a photonic honeycomb lattice. However, inphotonics, the interaction between spin and pseudospin for light has never beeninvestigated. In this Letter, we propose that, in an optical analogue ofstaggered graphene, i.e. a photonic honeycomb lattice waveguide with in-planeinversion symmetry breaking, the pseudospin mode can strongly couple to thespin of an optical beam incident along certain directions. The spin-pseudospincoupling, caused by the spin-orbit conversion in the scattering process,induces a strong optical chiral effect for the transmitted optical beam.Spin-pseudospin coupling of light opens door to the design ofpseudospin-mediated spin or valley selective photonic devices.

Pseudospin induced chirality with Staggered Optical Graphene