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Lu, Cuicui; Sun, Yi-Zhi; Wang, Chenyang; Zhang, Hongyu; Zhao, Wen; Hu, Xiaoyong; Xiao, Meng; Ding, Wei; Liu, Yong-Chun; Chan, C T
Nature communications, 05/2022, Letnik: 13, Številka: 1Journal Article
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.
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in: SICRIS
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