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利用时域有限差分(FDTD)法模拟了均匀结构、双层结构和三层结构光学微球腔,得到了各自的能量密度分布,通过对比发现多层结构具有更高的最大能量密度与存储能量和较小的模式体积。波导与多层微球腔之间存在一个最佳间隙,模拟结构的最佳间隙在60～120nm。改变高折射层的厚度和折射率,在特定波长的入射光下可以获得具有较高最大能量密度(大于360)或者较小模式体积的(小于0.03)的微球腔,确定了优化的厚度和折射率。分析高斯光激励的带有导出波导的微球腔,导出波导与微球腔中的光具有相似的激发频谱,表明多层微球腔可以对入射光实现选频并导出。结果显示,多层微球腔具有更好的性能,为光学微球腔后续的结构设计和实际应用提供了一个新的优化思路。
The time-domain finite difference (FDTD) method was used to simulate the uniform structure, the double-layer structure and the three-layer structure optical microspheres, and their energy density distributions were obtained. By comparison, it was found that the multilayer structure has higher maximum energy density and energy storage And the smaller model volume. There is an optimal gap between the waveguide and the multi-layer micro-sphere, and the best gap of the simulation structure is between 60 and 120 nm. By changing the thickness and refractive index of the high refractive layer, a microsphere cavity with a higher maximum energy density (greater than 360) or a smaller mode volume (less than 0.03) can be obtained at a specific wavelength of incident light, with optimized thickness and Refractive index. The analysis of Gaussian light-induced microsphere cavities with derivation waveguides leads to a similar excitation spectrum of the light in the microsphere cavities, indicating that the multi-layer microsphere cavities can frequency-select and derive incident light. The results show that the multi-layer micro-cavity has better performance and provides a new optimization idea for the follow-up structural design and practical application of the optical micro-cavity.