Parity-time-symmetric whispering-gallery mode nanoparticle sensor[Invited]  

作　　者：WEIJIAN CHEN JING ZHANG BO PENG SAHIN KAYA OZDEMIR XUDONG FAN LAN YANG 

机构地区：[1]Department of Electrical and Systems Engineering,Washington University,St.Louis,Missouri 63130,USA [2]Department of Automation,Tsinghua University,Beijing 100084,China [3]Department of Biomedical Engineering,University of Michigan,Ann Arbor,Michigan 48109,USA

出　　处：《Photonics Research》2018年第5期I0004-I0011,共8页光子学研究（英文版）

基　　金：Army Research Office(ARO)(W911NF-12-1-0026,W911NF1710189);National Natural Science Foundation of China(NSFC)(11674194,61134008,61622306);National Basic Research Program of China(973 Program)(2014CB921401);Tsinghua University Initiative Scientific Research Program;Tsinghua National Laboratory for Information Science and Technology(TNList)Cross-discipline Foundation;National Science Foundation(NSF)(ECCS-1303499);Directorate for Engineering(ENG)(EFMA1641109)

摘　　要：We present a study of single nanoparticle detection using parity-time （PT） symmetric whispering-gaUery 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 nanopartide 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 nanopartides 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.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.

关 键 词：arity-time-symmetric whispering-gallery mode nanoparticle sensor 

分 类 号：TN1[电子电信—物理电子学]