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采用聚苯乙烯材料制作出不同直径(50～250μm)的球形光学微腔并实现了微腔与锥形光纤的耦合,测量了球形光学微腔在1570～1576nm波长范围内的吸收光谱,实验结果表明球形光学微腔在这一波长范围内可发生基于回音壁模式(WGM)的光学谐振,且WGM吸收峰的相邻波长间隔随着聚苯乙烯微球直径的增大而减小。通过吸收光谱计算了聚苯乙烯微球在其本征频率下的品质因子,结果表明微球品质因子数量级均在104以上。
The spherical optical microcavities with different diameters (50 ~ 250μm) were made by polystyrene and the coupling between microcavities and tapered optical fibers was realized. The absorption spectra of spherical optical microcavities in the wavelength range of 1570 ~ 1576nm were measured. The experimental results It is shown that the spherical optical microcavity can produce optical resonance based on the whispering gallery mode (WGM) in this wavelength range, and the adjacent wavelength spacing of the WGM absorption peak decreases with the increase of the diameter of polystyrene microspheres. The quality factor of polystyrene microspheres at their eigenfrequency was calculated by absorption spectrum. The results showed that the quality factor of microspheres was all above 104.