Unique Huygens-Fresnel electromagnetic transportation of chiral Dirac wavelet in topological photonic crystal

Xing-Xiang Wang, Zhiwei Guo, Juan Song, Haitao Jiang, Hong Chen () and Xiao Hu ()
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Xing-Xiang Wang: Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS)
Zhiwei Guo: Tongji University
Juan Song: Tongji University
Haitao Jiang: Tongji University
Hong Chen: Tongji University
Xiao Hu: Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS)

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Light propagates in various ways depending on environment, including uniform medium, surface/interface and photonic crystals, which appears ubiquitously in daily life and has been exploited for advanced optics technology. We unveiled that a topological photonic crystal exhibits unique electromagnetic (EM) transport properties originating from the Dirac frequency dispersion and multicomponent spinor eigenmodes. Measuring precisely local Poynting vectors in microstrips of honeycomb structure where optics topology emerges upon a band gap opening in the Dirac dispersion and a p-d band inversion induced by a Kekulé-type distortion respecting C6v symmetry, we showed that a chiral wavelet induces a global EM transportation circulating in the direction counter to the source, which is intimately related to the topological band gap specified by a negative Dirac mass. This brand-new Huygens-Fresnel phenomenon can be considered as the counterpart of negative refraction of EM plane waves associated with upwardly convex dispersions of photonic crystals, and our present finding is expected to open a new window for photonic innovations.

Date: 2023
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DOI: 10.1038/s41467-023-38325-8

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