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引入了色散介质的时域有限差分法散射场方程,并针对光子扫描隧道显微镜的带金属尖光纤扫描成像问题进行三维的数值模拟。在考虑了光纤和样品相互作用的情况下,采用等效入射波法设置入射波,探针扫描模式为等高扫描模式,从成像分辨力和灵敏度的角度,比较了不同入射角、不同的光纤样品间距,不同金属类型,及不同金属尖大小的成像情况。数值模拟结果显示,带金属颗粒光纤探针尖的光子扫描隧道显微镜在成像分辨力和灵敏度上有显著的改进,而带不同类型金属颗粒情况下对分辨力影响不大,灵敏度是银最好。
The dispersion field time-domain finite difference method scattering field equation is introduced, and the three-dimensional numerical simulation is carried out for the problem of metal tip optical fiber scanning with photon scanning tunneling microscope. Considering the interaction between the optical fiber and the sample, the incident wave is set by the equivalent incident wave method. The scanning mode of the probe is the contour scanning mode. From the angle of imaging resolution and sensitivity, the different incident angles and different optical fibers Sample spacing, different metal types, and different metal tip size of the imaging situation. The results of numerical simulation show that the photon-scanning tunneling microscope with metal-fiber probe has a significant improvement on the imaging resolution and sensitivity, while with different types of metal particles has little effect on the resolution, the sensitivity is silver is the best.