Parity-time-symmetric whispering-gallery mode nanoparticle sensor [Invited]
Parity-time-symmetric whispering-gallery mode nanoparticle sensor [Invited]
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DOI：
10.1364/prj.6.000a23
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发表时间：
2018-05-01
影响因子：
7.6
通讯作者：
Yang, Lan
中科院分区：
文献类型：
--
作者：
Chen, Weijian;Zhang, Jing;Yang, Lan
我们提出了一个研究单一的纳米粒子检测使用奇偶时间（PT）对称回音壁模式（WGM）谐振器。我们的理论模型和数值模拟表明，与平衡的增益和损耗，PT对称WGM纳米颗粒传感器，量身定制的操作在PT相变点（也称为例外点），表现出显着的增强频率分裂相比，一个单一的WGM纳米颗粒传感器受到相同的扰动。PT对称系统中增益的存在导致更窄的线宽，这有助于解决频率分裂中的较小变化并提高纳米颗粒传感的检测限。此外，我们还提供了一个通用的方法来检测多个纳米粒子进入一个PT对称WGM传感器的模式体积一个接一个。我们的研究表明PT对称WGM谐振器用于超灵敏单个纳米颗粒和生物分子传感的可行性。(C)2018中国激光出版社.
We present a study of single nanoparticle detection using parity-time (PT) symmetric whispering-gallery mode (WGM) resonators. Our theoretical model and numerical simulations show that, with balanced gain and loss, the PT-symmetric WGM nanoparticle sensor, tailored to operate at PT phase transition points (also called exceptional points), exhibits significant enhancement in frequency splitting when compared with a single WGM nanoparticle sensor subject to the same perturbation. The presence of gain in the PT-symmetric system leads to narrower linewidth, which helps to resolve smaller changes in frequency splitting and improve the detection limit of nanoparticle sensing. Furthermore, we also provide a general method for detecting multiple nanoparticles entering the mode volume of a PT-symmetric WGM sensor one by one. Our study shows the feasibility of PT-symmetric WGM resonators for ultrasensitive single nanoparticle and biomolecule sensing. (C) 2018 Chinese Laser Press.