Chiral and multiple one-way surface states on photonic gyroelectric metamaterials with small Chern number
- 29 September 2021
- journal article
- research article
- Published by Optica Publishing Group in Optics Express
- Vol. 29 (21), 33097-33108
- https://doi.org/10.1364/oe.427068
Abstract
Topological one-way surface states allow light to pass through sharp corners without reflection. In order to enhance the capability of surface routing devices, multiple one-way surface modes are usually required. Different from previously reported multiple surface modes achieved with large Chern number photonic media, we realize multiple surface waves on a continuous medium with small Chern number, i.e., |C| = 1. The new topological phase is found when the hyperbolic and double semi-ellipsoid-like cone bands are simultaneously gapped by vacuum state. We also find the degeneracy of multiple one-way surface waves in the double semi-ellipsoid-like metamaterials. The propagation direction of the waves is determined by their own ellipticities. Our results may help to construct surface state devices with multiplexing capability and higher coupling efficiency.Funding Information
- National Natural Science Foundation of China (11874132, 12074087, 61575055)
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