Enhancement of Spontaneous Emission and Surface Plasmon Polariton Propagation of Quantum Dots Fluorescence in a Coupling Structure of Gold Nanosphere and Sliver Nanowire

被引：0
作者：
Yuan H. [1 ]
Zhong Y. [2 ]
Liu H. [1 ]
机构：
[1] Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, Institute of Modern Optics, College of Electronic Information and Optical Engineering, Tianjin
[2] State Key Laboratory of Precision Measurement Technology and Instruments, School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin
来源：
Zhongguo Jiguang/Chinese Journal of Lasers | 2020年 / 47卷 / 10期
关键词：
Fluorescence; Metal optics; Micro/nano optics; Nano-manipulation; Nanostructures; Surface plasmon;
D O I：
10.3788/CJL202047.1013001
中图分类号：
学科分类号：
摘要：
Based on the atomic force microscope (AFM), the fluorescence microscopic imaging system and the time-correlated single photon counting (TCSPC) system, the spontaneous emission enhancement of quantum dots and the fluorescence surface plasmon polariton (SPP) propagation are studied in a coupling structure of a gold nano-sphere (AuNS) and a sliver nano-wire (AgNW). The coupling between the AuNS and the AgNW is achieved in two ways. Firstly, a mixed solution of AuNSs and quantum dots, and the solution of AgNWs are successively coated on a SiO2 substrate to look for the AuNS-AgNW coupling structures that are randomly formed. Secondly, a controlled AuNS-AgNW coupling structure is achieved by using the AFM nano-manipulation. Based on the AuNS-AgNW coupling structure with quantum dots in its nano-gap, the experimental results show that the enhancement factor of the spontaneous emission rate of the quantum dots fluorescence can be up to 611 and the propagation of the fluorescence SPP along the AgNW is also observed. COMSOL Multiphysics software is used to simulate the enhancement factor of the spontaneous emission rate of a quantum dot with different positions and polarizations near the AuNS-AgNW coupling structure. The results are compared with those of a quantum dot coupled with single AuNS and single AgNW, showing that the AuNS-AgNW coupling structure can provide a higher enhancement factor of the spontaneous emission rate. The propagation of the SPP along the AgNW excited by the point source is also calculated. The simulation results agree well with the experimental results. © 2020, Chinese Lasers Press. All right reserved.
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