Researchers have demonstrated the realization of Z2 topological photonic insulators using multilayer tungsten disulfide (WS2), a transition metal dichalcogenide, for advanced nanophotonic applications. By leveraging the material’s high refractive index, optical anisotropy, and robust excitonic properties, they designed spin-Hall topological photonic lattices featuring unidirectional edge states. The lattices, patterned with precise triangular nanoholes, showcase propagation of light along domain interfaces with low scattering losses. The study emphasizes WS2’s versatility, including ease of integration onto substrates and tunable optical properties through thickness and lattice configurations. These findings mark a significant step in applying van der Waals materials to create scalable, high-performance photonic devices.
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https://pubs.acs.org/doi/10.1021/acsnano.4c09295
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