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Strong light-matter coupling enabled polariton states were extensively exploited for enhanced optical nonlinearities, development of low threshold lasers and quantum simulators. Here, we will report our recent work on demonstration of novel topological polaritonic phases by leveraging the strong coupling between the photonic topological boundary states and two different material degrees of freedom in 2D Van der Waals materials; first transverse optical phonons in a hexagonal boron nitride (hBN) thin film and second excitons in 2D WSe2 monolayer. Our results will demonstrate emergence of topological boundary states of phonon-polariton and exciton-polariton character, and their resilient unidirectional propagation around sharp corner with avoided backscattering.
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Sriram Guddala, Filipp Komissarenko, Svetlana Kiriushechkina, Anton Vakulenko, Vinod M. Menon, Alexander Khanikaev, Andrea Alù, "Topological polaritons in two-dimensional materials integrated photonic topological metasurfaces," Proc. SPIE PC12646, Metamaterials, Metadevices, and Metasystems 2023, PC126460J (4 October 2023); https://doi.org/10.1117/12.2680854