Asymmetric topological pumping in nonparaxial photonics

Qingqing Cheng, Huaiqiang Wang, Yongguan Ke, Tao Chen, Ye Yu, Yuri S. Kivshar (), Chaohong Lee () and Yiming Pan ()
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Qingqing Cheng: University of Shanghai for Science and Technology
Huaiqiang Wang: Nanjing University
Yongguan Ke: Sun Yat-Sen University (Zhuhai Campus)
Tao Chen: University of Shanghai for Science and Technology
Ye Yu: University of Shanghai for Science and Technology
Yuri S. Kivshar: Nonlinear Physics Centre, Research School of Physics, Australian National University
Chaohong Lee: Sun Yat-Sen University (Zhuhai Campus)
Yiming Pan: Physics Department and Solid State Institute, Technion

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

Abstract: Abstract Topological photonics was initially inspired by the quantum-optical analogy between the Schrödinger equation for an electron wavefunction and the paraxial equation for a light beam. Here, we reveal an unexpected phenomenon in topological pumping observed in arrays of nonparaxial optical waveguides where the quantum-optical analogy becomes invalid. We predict theoretically and demonstrate experimentally an asymmetric topological pumping when the injected field transfers from one side of the waveguide array to the other side whereas the reverse process is unexpectedly forbidden. Our finding could open an avenue for exploring topological photonics that enables nontrivial topological phenomena and designs in photonics driven by nonparaxiality.

Date: 2022
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DOI: 10.1038/s41467-021-27773-9

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