Exceptional points and enhanced nanoscale sensing with a plasmon-exciton hybrid system  

作　　者：Hong Jiang Weidong Zhang Guowei Lu Lulu Ye Hai Lin Jinglin Tang Zhaohang Xue Zheng Li Haitan Xu Qihuang Gong 

机构地区：[1]State Key Laboratory for Mesoscopic Physics,Collaborative Innovation Center of Quantum Matter,Nano-optoelectronics Frontier Center of the Ministry of Education,School of Physics,Peking University,Beijing 100871,China [2]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China [3]Peking University Yangtze Delta Institute of Optoelectronics,Nantong 226010,China [4]Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China [5]School of Physical Sciences,University of Science and Technology of China,Hefei 230026,China

出　　处：《Photonics Research》2022年第2期557-563,共7页光子学研究（英文版）

基　　金：National Key Research and Development Program of China (2018YFB2200401);National Natural Science Foundation of China (11527901, 11974031,12174009, 61521004, 91950111)。

摘　　要：Singularities in the spectra of open systems, known as exceptional points(EPs), have been shown to exhibit nontrivial topological properties and enhanced sensitivities. Here, we propose a novel approach to realize the EPs in a plasmon-exciton hybrid system and explore their applications in enhanced nanoscale sensing technology.We consider a plasmon-exciton system composed of a gold nanorod and a monolayer WSe_(2). By controlling the geometric parameters of the nano-hybrid system, we obtain simultaneous coalescence of the resonance frequencies and loss rates of the hybrid system, which is a unique feature of EPs. Numerical simulations show its application in enhanced nanoscale sensing for environmental refractive indices. Our work opens the way to a new class of sensors based on EP-enhanced sensing, with intrinsic nanoscale sensitivity due to the sub-diffractionlimit size of the plasmon-exciton nano-hybrid system.

关 键 词：system PLASMON POINTS 

分 类 号：O53[理学—等离子体物理] TP212[理学—物理]