本文使用时域有限差分法研究了六种不同折射率分布的圆柱型光学微腔,计算了不同阶径向回音壁模式的能量分布和在棱镜耦合状态下的品质因数,分析了渐变型和突变型折射率分布对微腔性能的影响.在此基础上讨论了通过改变折射率分布来选择性增强特定阶模式和改善微腔性能的途径,这对微腔研究与应用的进一步发展具有一定的指导意义.

Six optical microcavities with different refractive index distribution are studied using the finite-difference time-domain method (FDTD). The energy distribution and quality factors of different radial-order whispering-gallery modes are calculated. The effect of step-index distribution and graded-index distribution are analyzed. Then the methods of enhancing certain modes and improving microcavity performance are also discussed. These results provide reference for the further study and application of optical microcavity.