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Fast encirclement of an exceptional point for highly efficient and compact chiral mode converters

Author

Listed:
  • Xiaoqian Shu

    (Huazhong University of Science and Technology)

  • Aodong Li

    (Huazhong University of Science and Technology)

  • Guangwei Hu

    (National University of Singapore
    City University of New York)

  • Jian Wang

    (Huazhong University of Science and Technology)

  • Andrea Alù

    (City University of New York
    City University of New York)

  • Lin Chen

    (Huazhong University of Science and Technology
    Peking University)

Abstract

Exceptional points (EPs) are degeneracies at which two or more eigenvalues and eigenstates of a physical system coalesce. Dynamically encircling EPs by varying the parameters of a non-Hermitian system enables chiral mode switching, that is, the final state of the system upon a closed loop in parameter space depends on the encircling handedness. In conventional schemes, the parametric evolution during the encircling process has to be sufficiently slow to ensure adiabaticity. Here, we show that fast parametric evolution along the parameter space boundary of the system Hamiltonian can relax this constraint. The proposed scheme enables highly efficient transmission and more compact footprint for asymmetric mode converters. We experimentally demonstrate these principles in a 57 μm-long double-coupled silicon waveguide system, enabling chiral mode switching with near-unity transmission efficiency at 1550 nm. This demonstration paves the way towards high-efficiency and highly integrated chiral mode switching for a wide range of practical applications.

Suggested Citation

  • Xiaoqian Shu & Aodong Li & Guangwei Hu & Jian Wang & Andrea Alù & Lin Chen, 2022. "Fast encirclement of an exceptional point for highly efficient and compact chiral mode converters," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29777-5
    DOI: 10.1038/s41467-022-29777-5
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