Helical Topological Exciton-Polaritons on a Tungsten Disulfide-based Device (IMAGE)
Caption
On the left, an image of the Agarwal group's device, a single layer of tungsten disulfide (WS2) on a periodically patterned photonic crystal. Strong coupling between the excitons of WS2 with the photonic crystal leads to the formation of exciton-photon polaritons with helical topological properties. On the right, the bright spot is circularly polarized light exciting helical topological exciton-polaritons, which have a particular spin and propagate forward, bending around sharp corners with no backscattering
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University of Pennsylvania
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