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为了深入研究扫描近场光学显微镜(Scanning near-field optical microscope,SNOM)光纤探针导光特性,我们利用VirtualLab Fusion光学软件,仿真研究了光纤探针内部的光场分布.结果显示,光纤探针内部的光场分布呈固定的花样;中轴线光场具有峰值结构,其最大值位于探针出口前120nm处;这个最大峰值随着光纤外层铝层厚度的增加呈现先减小后增加,最后趋于稳定的变化,随着光源偏振态的变化呈现正弦的分布.
In order to further study the light-guiding properties of the fiber probe of a scanning near-field optical microscope (SNOM), we use VirtualLab Fusion software to simulate the light field distribution inside the fiber probe. The results show that the fiber probe The internal optical field distribution is a fixed pattern; the central axis of the optical field has a peak structure, the maximum at the exit of the probe at 120nm; this maximum peak with the optical fiber outer layer thickness increases first and then increase, and finally Stable changes tend to show sinusoidal distribution as the polarization state of the light source changes.