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9 September 2019 Topological one-way fibers (Conference Presentation)
Ling Lu, Haozhe Gao, Zhong Wang
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Proceedings Volume 11081, Active Photonic Platforms XI; 110810A (2019) https://doi.org/10.1117/12.2524530
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States
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.
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Ling Lu, Haozhe Gao, and Zhong Wang "Topological one-way fibers (Conference Presentation)", Proc. SPIE 11081, Active Photonic Platforms XI, 110810A (9 September 2019); https://doi.org/10.1117/12.2524530
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KEYWORDS
Photonic crystals
Crystals
Modulation
Magnetism
Microwave radiation
Phase velocity
Photonic crystal fibers
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