Single-Mode Wireless Sensing by Nonlinear Parity-Time-Symmetric Circuits

Zhipeng Li, J. S. Ho
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Abstract

Wireless sensing in parity-time-symmetric system by interplay between gain and loss have shown enhanced sensitivity due to the nonlinear response. Here, we report single-mode wireless sensing using nonlinear parity-time-symmetric circuits. We observe an exceptional point where the frequency response of system is nonlinear following square-root-topology. We also observe frequency hopping point by single-mode switching due to the nonlinear saturable gain. We demonstrate wireless pressure sensing with enhanced sensitivity at an EP and HP compared to the traditional wireless sensing without gain. Wireless sensing by parity-time-symmetric circuits shows great potentials for highly sensitive biomedical sensing.
非线性奇偶-时间对称电路的单模无线传感
在奇偶时间对称系统中,增益和损耗相互作用的无线传感由于非线性响应而提高了灵敏度。在这里,我们报告单模无线传感使用非线性奇偶时间对称电路。我们观察到一个例外点,即系统的频率响应服从平方根拓扑是非线性的。由于非线性饱和增益,我们还观察到单模开关的跳频点。我们演示了与传统的无增益无线传感相比,在EP和HP下具有增强灵敏度的无线压力传感。基于奇偶时间对称电路的无线传感在高灵敏度生物医学传感领域显示出巨大的潜力。
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