Generalized parity-time symmetry condition for enhanced sensor telemetry
Generalized parity-time symmetry condition for enhanced sensor telemetry
复制标题
DOI：
10.1038/s41928-018-0072-6
复制
发表时间：
2018-05-01
影响因子：
34.3
通讯作者：
Alu, Andrea
中科院分区：
文献类型：
--
作者：
Chen, Pai-Yen;Sakhdari, Maryam;Alu, Andrea
基于微机械可调谐谐振器的无线传感器在从医疗诊断到工业和环境监测的各种应用中是重要的。然而，这些设备的灵敏度通常受到其低品质（Q）因子的限制。在这里，我们介绍的概念，等谱部分时间倒数标度（PTX）的对称性，并表明它可以用来建立一个新的家庭的射频无线微传感器表现出超灵敏的响应和分辨率，这是远远超出了传统的无源传感器的局限性。我们从理论上证明，并使用基于微机电的无线压力传感器进行实验证明，PTX对称电子系统与其宇称时间（PT）对称电子系统共享相同的本征频率，但至关重要的是具有不同的电路轮廓和本征模式。这简化了电子电路设计，并能够进一步增强传感器的外部Q因子。
Wireless sensors based on micromachined tunable resonators are important in a variety of applications, ranging from medical diagnosis to industrial and environmental monitoring. The sensitivity of these devices is, however, often limited by their low quality (Q) factor. Here, we introduce the concept of isospectral party-time-reciprocal scaling (PTX) symmetry and show that it can be used to build a new family of radiofrequency wireless microsensors exhibiting ultrasensitive responses and ultrahigh resolution, which are well beyond the limitations of conventional passive sensors. We show theoretically, and demonstrate experimentally using microelectromechanical-based wireless pressure sensors, that PTX-symmetric electronic systems share the same eigenfrequencies as their parity-time (PT)-symmetric counterparts, but crucially have different circuit profiles and eigenmodes. This simplifies the electronic circuit design and enables further enhancements to the extrinsic Q-factor of the sensors.