Schematic of the Construction of Photonic Higher-Order Topological Insulators (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Schematic of the Construction of Photonic Higher-Order Topological Insulators

Caption

a, An array of coupled ring resonators (green), each with an embedded electro-optic modulator (orange). b, The corresponding lattice in real and synthetic dimensions, x and frequency, respectively. The lattice shows higher-order topological behavior, such as the existence of corner modes. (c), Real-space structure for realizing a fourth-order topological insulator. (d), Corresponding lattice in real and synthetic space is a hypercube (a four-dimensional cube), where the inner 3D cube corresponds to the bottom of rings in (c), and the outer cube corresponds to the top row of rings in (c).

Credit

by Avik Dutt, Momchil Minkov, Ian A. D. Williamson, and Shanhui Fan

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