基于二阶异常点的超灵敏无线距离传感器  

Ultra-sensitive wireless distance sensor based on second-order exceptional point

作　　者：朱艳萍 冯磊 程瑜华 ZHU Yanping;FENG Lei;CHENG Yuhua(School of Electronics and Information Engineering,Hangzhou Dianzi University,Hangzhou Zhejiang 310018,China)

机构地区：[1]杭州电子科技大学电子信息学院,浙江杭州310018

出　　处：《杭州电子科技大学学报(自然科学版)》2025年第2期7-12,共6页Journal of Hangzhou Dianzi University:Natural Sciences

摘　　要：自从宇称时间对称的概念引入到电子学中,该概念中特有的异常点简并现象引起了人们的关注;在异常点周围系统对微小扰动具有很大的频率响应,这为电子传感领域的研究提供了新的思路。通过一对电感耦合谐振器来实现具有平衡增益和损耗的二阶宇称时间对称系统,利用耦合模理论推导了系统的二阶异常点条件和耦合受到小扰动时异常点周围系统的扰动频率响应;理论分析表明,系统在奇异点附近的频移与扰动的平方根成正比。仿真和实验验证了系统对微小扰动κ的高灵敏度,这表明可以利用二阶异常点实现灵敏度为Δf∝κ^(1/2)超灵敏距离探测传感器。Since the concept of parity-time symmetry was introduced into electronics,the unique exception point degeneracy phenomenon in it has attracted much attentions.The system around the exception point has a large frequency response to small perturbations,which provides new perspectives for research in the field of electronic sensing.This paper implements a second-order parity-time symmetric system with balanced gain and loss through a pair of inductively coupled resonators.The second-order exception point condition of the system,and the perturbed frequency response of the system which is around the exception point when the coupling is subjected to a small perturbation,are derived using coupled mode theory,and the frequency shift of the system around the exception point is theoretically proportional to the square root of the perturbation.The high sensitivity of the system to a small perturbation κ is verified by simulations and experiments,and it is demonstrated that an ultra-sensitive distance detection sensor with a sensitivity of Δf∝κ~(1/2) can be realized using second-order exception point.

关 键 词：异常点 宇称时间对称 无线传感器 灵敏度 

分 类 号：TN401[电子电信—微电子学与固体电子学]