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本文基于时域有限差分方法(finite difference time domain,FDTD)研究了入射光波长、入射光偏振方向、纳米管几何形状、管壁厚度及内核和包埋介质的变化对椭圆截面金纳米管近场分布特征的影响.研究发现,入射光波长为纳米管等离激元共振波长时,纳米管近场增强最大;入射光偏振方向与椭圆长轴夹角的增加会导致管内的场强迅速增大;椭圆管半短轴变大可以调节纳米管场强分布从两端高、中间低变化为均匀分布;内核和包埋介质介电常数的增大均会使得纳米管内部及周围场强逐渐减弱.
Based on FDTD, the effects of the incident light wavelength, the polarization direction of incident light, the geometry of nanotubes, the thickness of the tube wall, the change of the inner core and embedding medium, Distribution characteristics.The results show that when the wavelength of incident light is the wavelength of the plasmon resonance of the nanotube, the near field enhancement of the nanotube is the largest. The increase of the angle between the polarization direction of the incident light and the long axis of the ellipse will rapidly increase the field strength in the tube The larger semi-minor axis of elliptical tube can adjust the distribution of the field strength of nanotubes from high and low in both ends to uniform distribution. The increase of the dielectric constant of inner core and embedding medium will weaken the field strength in and around the nanotube. .