Visualization of topological transitions and imaging of higher-order topological states in photonic metasurfaces

Anton Vakulenko; Svetlana Kiriushechkina; Mingsong Wang; Mengyao Li; Dmitriy Zhirihin; Xiang Ni; Sriram Guddala; Dmitriy Korobkin; Andrea Alù; Alexander B. Khanikaev

doi:10.1117/12.2569324

20 August 2020 Visualization of topological transitions and imaging of higher-order topological states in photonic metasurfaces

Anton Vakulenko, Svetlana Kiriushechkina, Mingsong Wang, Mengyao Li, Dmitriy Zhirihin, Xiang Ni, Sriram Guddala, Dmitriy Korobkin, Andrea Alù, Alexander B. Khanikaev

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Proceedings Volume 11461, Active Photonic Platforms XII; 114611E (2020) https://doi.org/10.1117/12.2569324
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Abstract

In this work we design and experimentally realize a photonic kagome metasurface exhibiting a Wannier-type higher-order topological phase. We demonstrate and visualize the emergence of a topological transition and opening of a Dirac cone by directly exciting the bulk modes of the HOTI metasurface via solid-state immersion spectroscopy. The open nature of the metasurface is then utilized to directly image topological boundary states. We show that, while the domain walls host 1D edge states, their bending induces 0D higher-order topological modes confined to the corners. The demonstrated metasurface hosting topological boundary modes of different dimensionality paves the way to a new generation of universal and resilient optical devices which can controllably scatter, trap and guide optical fields in a robust way.

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Anton Vakulenko, Svetlana Kiriushechkina, Mingsong Wang, Mengyao Li, Dmitriy Zhirihin, Xiang Ni, Sriram Guddala, Dmitriy Korobkin, Andrea Alù, and Alexander B. Khanikaev "Visualization of topological transitions and imaging of higher-order topological states in photonic metasurfaces", Proc. SPIE 11461, Active Photonic Platforms XII, 114611E (20 August 2020); https://doi.org/10.1117/12.2569324

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