光学学报, 2020, 40 (4): 0426001, 网络出版: 2020-02-17
金属-介质-金属纳米天线阵列的模式特性及荧光发射调控 下载: 1721次
Mode Properties and Fluorescence Emission Mediation of Metal-Dielectric-Metal Nanoantenna Array
物理光学 局域表面等离激元 磁等离激元 时域有限差分 荧光辐射 physical optics localized surface plasmon magnetic plasmon polariton finite-difference time-domain fluorescence radiation
摘要
设计一种支持多模式的金属-介质-金属纳米天线阵列结构,分析结构中的模式特性及其调控的发光过程。利用时域有限差分的方法模拟该结构的透射谱和电场分布,分析结构中局域表面等离激元模式和磁等离激元共振模式的特性以及激发光偏振调控的模式变化。将偶极子光源放在介质层中,模拟该天线阵列结构调控荧光分子的发光过程。结果表明:荧光分子的辐射和非辐射衰减速率增强因子、量子效率以及偏振特性受到了所提结构模式的有效调控;在一定波长范围内改变激发光的偏振方向可以对发光谱进行调谐。
Abstract
In this paper, a metal-dielectric-metal nanoantenna array structure that supports multiple modes is designed. The mode properties and mediation for fluorescence emission of the proposed structure are analyzed. The transmission spectrum and electric field distribution of the proposed structure were simulated by the finite-difference time-domain method. Moreover, the mode properties of the localized surface plasmon mode and magnetic plasmon polaritons resonance mode, and the mode changes modulated by the excitation light polarization were analyzed. A dipole source was placed in the dielectric layer to simulate the luminescence process which the nanoantenna array structure regulating fluorescent molecule. The simulation results show that the radiation and non-radiation decay rate enhancement factors, quantum efficiency, and polarization characteristics of the fluorescence molecule are effectively modulated by the proposed structure. Besides, the emission spectrum can be tuned within a certain wavelength range by changing the polarization direction of excitation light.
王晗, 臧昊峰, 鲁拥华, 王沛. 金属-介质-金属纳米天线阵列的模式特性及荧光发射调控[J]. 光学学报, 2020, 40(4): 0426001. Han Wang, Haofeng Zang, Yonghua Lu, Pei Wang. Mode Properties and Fluorescence Emission Mediation of Metal-Dielectric-Metal Nanoantenna Array[J]. Acta Optica Sinica, 2020, 40(4): 0426001.