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基于耦合模理论对微管谐振腔结构进行了分析,研究了微管谐振腔的回音壁谐振模式(WGM,Whispering Gallery Mode)及其电磁场分布,在此基础上推导了微径光纤与薄壁微管耦合的相位匹配条件。利用湿法腐蚀和熔融拉锥的方式分别制备了实验所需的微径光纤与薄壁微管,通过耦合实验在薄壁微管中激发出WGM模式,通过改变光纤与微管的参数进行比对实验,比较光纤与微管耦合效率的变化,实验结果表明,特定耦合参数下的高耦合效率验证了相位匹配条件。
Based on the coupled-mode theory, the structure of the microtube resonator is analyzed. The whispering gallery mode (WGM) and the electromagnetic field distribution of the microtubule resonator are studied. Based on the analysis, Phase matching conditions. The micro-diameter optical fibers and thin-walled microtubes required for the experiments were prepared respectively by means of wet etching and fused taper. The WGM mode was excited in the thin-walled microtubes through the coupling experiments. The comparison experiments were carried out by changing the parameters of the optical fiber and the microtubes. The coupling efficiency between optical fiber and microtubule changes. The experimental results show that the phase coupling condition is verified by the high coupling efficiency under certain coupling parameters.