选取高品质因数的圆弓形散射元微腔构建耦合波导，通过改变散射元参数和耦合腔散射元平移等方法，得出光子晶体耦合腔波导结构的慢光变化规律，并实现很好平带下的极高群折射率。模拟结果显示，不同微腔个数的耦合波导，通过调整短轴/长轴之比和散射元平移等方式，不仅可以获得各种平带慢光曲线，还可以获得群折射率从4.10×104到1.35×105的超低慢光结构。

Based on coupled waveguide with eye-shaped scatterer cavities with high-quality Q values, operations such as changing the parameters of the scatterers and changing those of the coupling cavities reveal the patterns about the variation of slow light effect on photonic crystal coupled waveguide and can achieve very high group index within the flat band. Simulations prove that regardless of the number of coupling cavities, slow light with decent flat band and structures with ultra-slow light and group index between 4.10×104 and 1.35×105 can be achieved by adjusting the ratio of the major axis to the minor axis and by shifting the scatterers.