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Floquet parity-time symmetry in integrated photonics

Author

Listed:
  • Weijie Liu

    (Shandong University)

  • Quancheng Liu

    (Bar-Ilan University)

  • Xiang Ni

    (Central South University
    City University of New York)

  • Yuechen Jia

    (Shandong University)

  • Klaus Ziegler

    (Universität Augsburg)

  • Andrea Alù

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

  • Feng Chen

    (Shandong University)

Abstract

Parity-time (PT) symmetry has been unveiling new photonic regimes in non-Hermitian systems, with opportunities for lasing, sensing and enhanced light-matter interactions. The most exotic responses emerge at the exceptional point (EP) and in the broken PT-symmetry phase, yet in conventional PT-symmetric systems these regimes require large levels of gain and loss, posing remarkable challenges in practical settings. Floquet PT-symmetry, which may be realized by periodically flipping the effective gain/loss distribution in time, can relax these requirements and tailor the EP and PT-symmetry phases through the modulation period. Here, we explore Floquet PT-symmetry in an integrated photonic waveguide platform, in which the role of time is replaced by the propagation direction. We experimentally demonstrate spontaneous PT-symmetry breaking at small gain/loss levels and efficient control of amplification and suppression through the excitation ports. Our work introduces the advantages of Floquet PT-symmetry in a practical integrated photonic setting, enabling a powerful platform to observe PT-symmetric phenomena and leverage their extreme features, with applications in nanophotonics, coherent control of nanoscale light amplification and routing.

Suggested Citation

  • Weijie Liu & Quancheng Liu & Xiang Ni & Yuechen Jia & Klaus Ziegler & Andrea Alù & Feng Chen, 2024. "Floquet parity-time symmetry in integrated photonics," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45226-x
    DOI: 10.1038/s41467-024-45226-x
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    References listed on IDEAS

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    2. Jiaming Li & Andrew K. Harter & Ji Liu & Leonardo de Melo & Yogesh N. Joglekar & Le Luo, 2019. "Observation of parity-time symmetry breaking transitions in a dissipative Floquet system of ultracold atoms," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
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