车衍子亦,廖志斌,彭星,等. 基于PT对称的亚波长谐振耦合超灵敏传感[J]. 电波科学学报,2021,36(6):964-969. DOI: 10.12265/j.cjors.2021161
      引用本文: 车衍子亦,廖志斌,彭星,等. 基于PT对称的亚波长谐振耦合超灵敏传感[J]. 电波科学学报,2021,36(6):964-969. DOI: 10.12265/j.cjors.2021161
      CHE Y Z Y, LIAO Z B, PENG X, et al. The supersensitive sensor of parity-time symmetry in coupled subwavelength resonator[J]. Chinese journal of radio science,2021,36(6):964-969. (in Chinese). DOI: 10.12265/j.cjors.2021161
      Citation: CHE Y Z Y, LIAO Z B, PENG X, et al. The supersensitive sensor of parity-time symmetry in coupled subwavelength resonator[J]. Chinese journal of radio science,2021,36(6):964-969. (in Chinese). DOI: 10.12265/j.cjors.2021161

      基于PT对称的亚波长谐振耦合超灵敏传感

      The supersensitive sensor of parity-time symmetry in coupled subwavelength resonator

      • 摘要: 为进一步实现超灵敏传感测量能力,提出了一种将宇称-时间(parity time, PT)对称与金属螺旋结构相结合的设计方案. 将电阻元件引入亚波长谐振单元,实现复数的谐振频率,令整个耦合系统的PT对称;通过改变相邻谐振单元之间的距离,使耦合系统达到奇异点(exceptional point, EP);利用EP附近对微扰的超灵敏响应,实现耦合系统对位移的超灵敏传感,并进行了理论分析、数值仿真和实验测量. 结果表明,对于0.05个波长的极小位移量,基于PT对称的金属螺旋结构测量系统比传统的测量系统能得到更大的频率变化,证实了本方案具有更高的灵敏度. 本系统同时还具有易构造、低剖面等特点,在建筑工程、建筑探测等方面有着广泛的应用前景.

         

        Abstract: To further achieve the sensing and measurement capabilities of supersensitive sensor, a method of combining PT symmetry and subwavelength metal spiral structure is proposed. Resistance elements are introduced into the resonant unit to achieve complex resonance frequencies and make the coupling system match PT symmetry conditions. By adjusting the distance between adjacent resonant units, we approach the exceptional point. Using the ultra-sensitive response to perturbation near the exceptional point, the ultra-sensitive sensing system is realized. Moreover, the theoretical analysis, numerical simulation and experimental measurement are carried out. The results show that, for a very small displacement of 0.05 wavelengths, the spoof surface plasmon measurement system based on PT symmetry can obtain greater frequency changes than the traditional measurement system, which confirms the prediction. The proposed system has the characteristics of construction, low profile, etc., which has a wide range of application prospects in construction engineering and construction detection.

         

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