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

Mingjian Li, Tengfei Hao (), Guozheng Li, Anle Wang, Yitang Dai, Wei Li, José Capmany, Jianping Yao, Ninghua Zhu and Ming Li ()
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Mingjian Li: Chinese Academy of Sciences
Tengfei Hao: Chinese Academy of Sciences
Guozheng Li: 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
José Capmany: Universitat Politècnica de València
Jianping Yao: University of Ottawa
Ninghua Zhu: Chinese Academy of Sciences
Ming Li: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-52958-3

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