Topological rainbow based on graded topological photonic crystals

Topological photonic crystal provides a robust platform for nanophotonic devices. However, few reports have been found to realize multiple frequency routing based on topological photonic states, which have restricted further applications in the field of nanophotonic devices. Here, for the first time...

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Bibliographic Details
Published in:Optics letters 2021-03, Vol.46 (6), p.1237
Main Authors: Zhang, Hongyu, Qian, Long, Wang, Chenyang, Ji, Chang-Yin, Liu, Yaotian, Chen, Jiali, Lu, Cuicui
Format: Article
Language:English
Subjects:
Crystal lattices
Photonic crystals
Rainbows
Robustness
Routers
Topology
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Summary:Topological photonic crystal provides a robust platform for nanophotonic devices. However, few reports have been found to realize multiple frequency routing based on topological photonic states, which have restricted further applications in the field of nanophotonic devices. Here, for the first time, to the best of our knowledge, we propose an efficient method to realize a topological rainbow based on graded dielectric topological photonic crystals, which are constructed by changing the degree of lattice contraction and expansion. The topological edge states of different frequencies are separated and trapped at different positions. The all-dielectric planar nanostructures of graded topological photonic crystals are low-loss, robust, and easy for integration. This Letter plays a key role in the use of robust nanophotonic wavelength routers, optical storage, and optical buffers.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.419271