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中文摘要：
使用时域有限差分法，对带表面壳层的光学微球腔进行模拟计算，分析了微腔内回音壁模式的能量密度分布，总结了壳层厚度对微球腔谐振性能的影响，并由此探讨对微球腔进行调谐和模式控制的方法．采用这种壳层结构，微球腔的谐振性能得到了有效提高（Q值提高了30%以上，模式体积减小了60％），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。
英文摘要：
The stratified structured microsphere cavity with high refractive index shell outer its surface was simulated using the finite-difference time-domain method （FDTD）. The energy density distributions of whispering-gallery modes （WGM） in the microsphere cavity have been analyzed, and resonance performance of stratified structured microsphere cavities with different shell thickness were compared too. Then the methods to tune the microsphere cavity or to control the resonant modes of microsphere cavity were presented and discussed. With this stratified structure, an effective enhance was achieved for the resonant performance of microsphere cavity （with Q value 30% larger and mode volume 60% smaller than the homogeneous structured mierosphere cavity）. These studies and results provide new optimizing methods for the subsequent structure design and practical application of microsphere cavity.
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