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Time-variant parity-time symmetry in frequency-scanning systems

Author

Listed:
  • Mingjian Li

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Tengfei Hao

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Guozheng Li

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Anle Wang

    (Air Force Early Warning Academy)

  • Yitang Dai

    (Beijing University of Posts and Telecommunications)

  • Wei Li

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • José Capmany

    (Universitat Politècnica de València)

  • Jianping Yao

    (University of Ottawa)

  • Ninghua Zhu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Ming Li

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

Abstract

Parity-time (PT) symmetry is an active research area that provides a variety of new opportunities for different systems with novel functionalities. For instance, PT symmetry has been used in lasers and optoelectronic oscillators to achieve single-frequency lasing or oscillation. A single-frequency system is essentially a static PT-symmetric system, whose frequency is time-invariant. Here we investigate time-variant PT symmetry in frequency-scanning systems. Time-variant PT symmetry equations and eigenfrequencies for frequency-scanning systems are developed. We show that time-variant PT symmetry can dynamically narrow the instantaneous linewidth of frequency-scanning systems. The instantaneous linewidth of a produced frequency-modulated continuous-wave (FMCW) waveform is narrowed by a factor of 14 in the experiment. De-chirping and radar imaging results also show that the time-variant PT-symmetric system outperforms a conventional frequency-scanning one. Our study paves the way for a new class of time-variant PT-symmetric systems and shows great promise for applications including FMCW radar and lidar systems.

Suggested Citation

  • Mingjian Li & Tengfei Hao & Guozheng Li & Anle Wang & Yitang Dai & Wei Li & José Capmany & Jianping Yao & Ninghua Zhu & Ming Li, 2024. "Time-variant parity-time symmetry in frequency-scanning systems," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52958-3
    DOI: 10.1038/s41467-024-52958-3
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    References listed on IDEAS

    as
    1. Weilin Liu & Ming Li & Robert S. Guzzon & Erik J. Norberg & John S. Parker & Mingzhi Lu & Larry A. Coldren & Jianping Yao, 2017. "An integrated parity-time symmetric wavelength-tunable single-mode microring laser," Nature Communications, Nature, vol. 8(1), pages 1-6, August.
    2. Jian Tang & Beibei Zhu & Weifeng Zhang & Ming Li & Shilong Pan & Jianping Yao, 2020. "Hybrid Fourier-domain mode-locked laser for ultra-wideband linearly chirped microwave waveform generation," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    3. Romain Fleury & Dimitrios Sounas & Andrea Alù, 2015. "An invisible acoustic sensor based on parity-time symmetry," Nature Communications, Nature, vol. 6(1), pages 1-7, May.
    4. Tengfei Hao & Qizhuang Cen & Yitang Dai & Jian Tang & Wei Li & Jianping Yao & Ninghua Zhu & Ming Li, 2018. "Breaking the limitation of mode building time in an optoelectronic oscillator," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    5. Jiejun Zhang & Lingzhi Li & Guangying Wang & Xinhuan Feng & Bai-Ou Guan & Jianping Yao, 2020. "Parity-time symmetry in wavelength space within a single spatial resonator," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
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