Controlled plasmon-enhanced fluorescence by spherical microcavity  

作　　者：Jingyi Zhao Weidong Zhang Te Wen Lulu Ye Hai Lin Jinglin Tang Qihuang Gong Guowei Lyu 赵静怡;张威东;温特;叶璐璐;林海;唐靖霖;龚旗煌;吕国伟(State Key Laboratory for Mesoscopic Physics,Frontiers Science Center for Nano-optoelectronics&Collaborative Innovation Center of Quantum Matter,School of Physics,Peking University,Beijing 100871,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China;Peking University Yangtze Delta Institute of Optoelectronics,Nantong 226010,China)

机构地区：[1]State Key Laboratory for Mesoscopic Physics,Frontiers Science Center for Nano-optoelectronics&Collaborative Innovation Center of Quantum Matter,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

出　　处：《Chinese Physics B》2021年第11期76-81,共6页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant No.2018YFB2200401);the Major Project of Basic and Applied Basic Research of Guangdong Province,China(Grant No.2020B0301030009);the National Natural Science Foundation of China(Grant Nos.91950111,61521004,and 11527901).

摘　　要：A surrounding electromagnetic environment can engineer spontaneous emissions from quantum emitters through the Purcell effect.For instance,a plasmonic antenna can efficiently confine an electromagnetic field and enhance the fluorescent process.In this study,we demonstrate that a photonic microcavity can modulate plasmon-enhanced fluorescence by engineering the local electromagnetic environment.Consequently,we constructed a plasmon-enhanced emitter(PE-emitter),which comprised a nanorod and a nanodiamond,using the nanomanipulation technique.Furthermore,we controlled a polystyrene sphere approaching the PE-emitter and investigated in situ the associated fluorescent spectrum and lifetime.The emission of PE-emitter can be enhanced resonantly at the photonic modes as compared to that within the free spectral range.The spectral shape modulated by photonic modes is independent of the separation between the PS sphere and PEemitter.The band integral of the fluorescence decay rate can be enhanced or suppressed after the PS sphere couples to the PE-emitters,depending on the coupling strength between the plasmonic antenna and the photonic cavity.These findings can be utilized in sensing and imaging applications.

关 键 词：localized surface plasmon resonance photonic microcavity 

分 类 号：O53[理学—等离子体物理] O657.3[理学—物理] TQ325.2[化学工程—合成树脂塑料工业]