Four-wave-mixing-induced robust exceptional point in a single electronic resonator

Lei Chen, Haichuan Li, Xiangyang Gong, Yu Zhong, Weibin Zhong, Gui-Shi Liu, Yaofei Chen, Yunhan Luo and Zhe Chen

Chaos, Solitons & Fractals, 2025, vol. 199, issue P3

Abstract: Exceptional points (EPs) offer significant promise for metrology via enhanced sensing, and electronic resonators have recently emerged as key platforms for EP generation due to their compactness and cost-effective components. However, an electronic resonator supports one eigenmode and thus struggles to adopt the optical platform's strategy for two-dimensional EP expansion, limiting robustness against fabrication flaws and environmental fluctuations. We introduce an approach to achieve robust EPs within a single electronic resonator. Specifically, by injecting a stabilized sinusoidal signal, the four-wave mixing mechanism inside the resonator generates a synthesized mode with the inherent mode, and these two modes form an anti-parity-time symmetry. This approach eliminates the physical inter-resonator coupling and reduces the number of resonators (the degree of freedom for EP generation), resulting in robust EP generation. Benefiting from the robust arrangement, a pronounced nonlinear feature leads to more than 40 branches of EP2 degeneracy lifting (achieving more than 20-fold sensitivity enhancement relative to conventional EP sensors) and enables the first observation of chiral spectra as a unique EP degeneracy fingerprint. More critically, this approach offers a digitally controlled EP, offering real-time and continuous tuning of coupling strength. Benefiting from the tuning property, a 6-dB SNR improvement is achieved through stochastic resonance. This architecture facilitates a robust platform for EP-based sensing, unlocking opportunities to exploit EP functionalities.

Keywords: Four-wave-mixing-induced exceptional point; Chaotic dynamics; Stochastic resonance; Single electronic resonator; Degeneracy lifting (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:chsofr:v:199:y:2025:i:p3:s0960077925009324

DOI: 10.1016/j.chaos.2025.116919

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