On-chip nanophotonic topological rainbow

Cuicui Lu (), Yi-Zhi Sun, Chenyang Wang, Hongyu Zhang, Wen Zhao, Xiaoyong Hu (), Meng Xiao, Wei Ding (), Yong-Chun Liu and C. T. Chan
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Cuicui Lu: Beijing Institute of Technology
Yi-Zhi Sun: Jinan University
Chenyang Wang: Beijing Institute of Technology
Hongyu Zhang: Beijing Institute of Technology
Wen Zhao: Beijing Institute of Technology
Xiaoyong Hu: Peking University
Meng Xiao: Wuhan University
Wei Ding: Jinan University
Yong-Chun Liu: Tsinghua University
C. T. Chan: The Hong Kong University of Science and Technology; Clear Water Bay, Kowloon

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract The era of Big Data requires nanophotonic chips to have large information processing capacity. Multiple frequency on-chip nanophotonic devices are highly desirable for density integration, but such devices are more susceptible to structural imperfection because of their nano-scale. Topological photonics provides a robust platform for next-generation nanophotonic chips. Here we give an experimental report of an on-chip nanophotonic topological rainbow realized by employing a translational deformation freedom as a synthetic dimension. The topological rainbow can separate, slow, and trap topological photonic states of different frequencies into different positions. A homemade scattering scanning near-field optical microscope with high resolution is introduced to directly measure the topological rainbow effect of the silicon-based photonic chip. The topological rainbow based on synthetic dimension have no restrictions for optical lattice types, symmetries, materials, wavelength band, and is easy for on-chip integration. This work builds a bridge between silicon chip technologies and topological photonics.

Date: 2022
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DOI: 10.1038/s41467-022-30276-w

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