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Proceedings Paper

Topological one-way fibers (Conference Presentation)
Author(s): Ling Lu; Haozhe Gao; Zhong Wang

Paper Abstract

One-way waveguides have been discovered as topological edge states in two-dimensional (2D) photonic crystals. Here, we design one-way fiber modes in a 3D magnetic Weyl pho- tonic crystal realizable at microwave frequencies. We first obtain a 3D Chern crystal with a non-zero first Chern number by annihilating the Weyl points through supercell modulation. When the modulation becomes helixes, one-way modes develop along the winding axis, with the number of modes determined by the spatial frequency of the helix. These single- polarization single-mode and multi-mode one-way fibers, having nearly identical group and phase velocities, are topologically-protected by the second Chern number in the 4D para- meter space of the 3D wavevectors plus the winding angle of the helix. This work suggests a unique way to utilize high-dimensional topological physics by topological defects.

Paper Details

Date Published: 9 September 2019
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Proc. SPIE 11081, Active Photonic Platforms XI, 110810A (9 September 2019); doi: 10.1117/12.2524530
Show Author Affiliations
Ling Lu, Institute of Physics (China)
Haozhe Gao, Institute of Physics (China)
Zhong Wang, Tsinghua Univ. (China)


Published in SPIE Proceedings Vol. 11081:
Active Photonic Platforms XI
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)

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