Generation and resilient routing of helical lattice vibrations in mid-infrared topological metasurfaces

Sriram Guddala; Filipp Komissarenko; Svetlana kirjushechkina; Anton Vakulenko; Mengyao Li; Vinod M. Menon; Andrea Alù; Alexander B. Khanikaev

doi:10.1117/12.2633222

3 October 2022 Generation and resilient routing of helical lattice vibrations in mid-infrared topological metasurfaces

Sriram Guddala, Filipp Komissarenko, Svetlana kirjushechkina, Anton Vakulenko, Mengyao Li, Vinod M. Menon, Andrea Alù, Alexander B. Khanikaev

Author Affiliations +

Proceedings Volume PC12196, Active Photonic Platforms 2022; PC121960M (2022) https://doi.org/10.1117/12.2633222
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

We report novel topological polaritonic states of half-light and half-phonon character in a topological mid-infrared metasurface integrating hexagonal boron nitride (hBN). A custom-built Fourier-space imaging microscope was used to investigate a three-dimensional band diagram of the photonic topological phonon-polaritonic states in our system for the first time. Our Fourier- and real-space imaging experimental findings, supported by theoretical models, demonstrate that topological properties of photonic modes are transcribed to the in-plane lattice vibrations (phonons) supported by hBN. As a result, the observed topological phonon-polaritons exhibit unidirectional propagation with the helical nature of vibrations and the resilience of the modes to sharp bends.

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Sriram Guddala, Filipp Komissarenko, Svetlana kirjushechkina, Anton Vakulenko, Mengyao Li, Vinod M. Menon, Andrea Alù, and Alexander B. Khanikaev "Generation and resilient routing of helical lattice vibrations in mid-infrared topological metasurfaces", Proc. SPIE PC12196, Active Photonic Platforms 2022, PC121960M (3 October 2022); https://doi.org/10.1117/12.2633222

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