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Loss-compensated non-reciprocal scattering based on synchronization

Author

Listed:
  • Tiemo Pedergnana

    (ETH Zürich)

  • Abel Faure-Beaulieu

    (ETH Zürich)

  • Romain Fleury

    (EPFL)

  • Nicolas Noiray

    (ETH Zürich)

Abstract

Breaking the reciprocity of wave propagation is a problem of fundamental interest, and a much-sought functionality in practical applications, both in photonics and phononics. Although it has been achieved using resonant linear scattering from cavities with broken time-reversal symmetry, such realizations have remained inescapably plagued by inherent passivity constraints, which make absorption losses unavoidable, leading to stringent limitations in transmitted power. In this work, we solve this problem by converting the cavity resonance into a limit cycle, exploiting the uncharted interplay between non-linearity, gain, and non-reciprocity. Remarkably, strong enough incident waves can synchronize with these self-sustained oscillations and use their energy for amplification. We theoretically and experimentally demonstrate that this mechanism can simultaneously enhance non-reciprocity and compensate absorption. Real-world acoustic scattering experiments allow us to observe non-reciprocal transmission of audible sound in a synchronization-based three-port circulator with full immunity against losses.

Suggested Citation

  • Tiemo Pedergnana & Abel Faure-Beaulieu & Romain Fleury & Nicolas Noiray, 2024. "Loss-compensated non-reciprocal scattering based on synchronization," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51373-y
    DOI: 10.1038/s41467-024-51373-y
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    References listed on IDEAS

    as
    1. Fabio Crameri & Grace E. Shephard & Philip J. Heron, 2020. "The misuse of colour in science communication," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
    2. Zhe Zhang & Pierre Delplace & Romain Fleury, 2021. "Superior robustness of anomalous non-reciprocal topological edge states," Nature, Nature, vol. 598(7880), pages 293-297, October.
    3. Tolga Dinc & Mykhailo Tymchenko & Aravind Nagulu & Dimitrios Sounas & Andrea Alu & Harish Krishnaswamy, 2017. "Synchronized conductivity modulation to realize broadband lossless magnetic-free non-reciprocity," Nature Communications, Nature, vol. 8(1), pages 1-9, December.
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