摘要
基于局域表面等离子共振(Local Surface Plasmon Resonance, LSPR)原理,本文利用有限元法研究了银圆锥纳米阵列共振波长的调控方法。使用COMSOL仿真软件模拟银圆锥纳米阵列表面附近的平均电场强度随入射光的变化,结果表明其共振波长与阵列周期和环境折射率有关。圆锥阵列周期p的增加,导致共振波长发生红移。两者间近似呈线性关系,可根据有效波长理论拟合得到阵列周期与共振波长间的线性关系式:p=0.97λ+21.244。圆锥半径r和高度h的变化对共振波长无影响。周期p为560 nm时,r=120 nm, h=200 nm,共振波长峰高达到最值。环境介质折射率增加导致共振波长红移,峰高减小,并且出现多个共振波峰。
Based on the principle of Local Surface Plasmon Resonance(LSPR), this paper uses the finite element method to study the method of adjusting the resonance wavelength of the silver cone nanoarray. COMSOL simulation software is used to simulate the variation of average electric field intensity near the surface of silver cone nano array with incident light. The results show that the resonance wavelength is related to the period of the array and the refractive index of the environment. With the increase of the period p of the conical array, the resonance wavelength is redshifted. There is a linear relationship between them, and the linear relationship between array period and resonance wavelength can be obtained by fitting according to effective wavelength theory: p=0.97λ+21.244. The variation of radius r and height h of cone has no effect on resonance wavelength. When the period of p is 560 nm, r=120 nm, h=200 nm, and the resonance wavelength peak reaches the maximum. The increase in the refractive index of the environmental medium leads to a red shift of the resonance wavelength, the peak height decreases, and multiple resonance peaks appear.
作者
葛小雪
王玉芳
GE Xiaoxue;WANG Yufang(Chinese Academy of Sciences,Chongqing Green And Intelligent Research Institute,Jiaxing Industrial Design Engineering Center,Jiaxing 31400,China;School of Physical Sciences,Naikai university,Tianjin 300071,China)
出处
《光散射学报》
2022年第2期161-166,共6页
The Journal of Light Scattering
