基于二维三角晶格空气孔光子晶体，通过在光子晶体单线缺陷波导两侧引入不同的耦合腔，设计了慢光特性较好的波导结构。利用平面波展开法计算波导的色散曲线，并分析慢光模式的群速度和群速度色散特性。耦合腔采用单缺陷腔时，适当调节波导宽度可以获得在零色散点群速度为0.0128c的慢光模式，对应在1.55 μm波长处的带宽为409 GHz。耦合腔采用长轴与波导方向呈60°的双缺陷腔，在超原胞大小为4a×9b（a，b分别为光子晶体在x，y方向的周期）时，通过调整波导宽度，可以获得在零色散点群速度为0.0070c的慢光模式，对应在1.55 μm波长处的带宽为226 GHz。进一步增大沿波导方向上双缺陷腔之间的距离，可以获得在零色散点群速度为0.0011c的慢光模式。同时可以根据具体情况选择合适的波导宽度参数，设计满足不同要求的慢光波导结构。

Based on two-dimensional triangular lattice air-hole photonic crystal, a kind of waveguide structure with good slow-light characteristics is proposed by inducing coupled-cavity on both sides of the photonic crystal single-line defected waveguides. The energy-band structure, group velocity and group-velocity dispersion characteristics of slow-light mode are analyzed by plane wave expansion method. For the waveguide structure using single-defect cavity as coupled cavity, the group velocity of 0.0128c at the zero-dispersion point with the bandwidth of 409 GHz in the 1.55 μm wavelength could be obtained by appropriately adjusting the waveguide width. As for the waveguide structure using two-defect cavity as coupled cavity with the super-cell of 4a×9b, the group velocity can reach 0.0070c at the zero-dispersion point with the bandwidth of 226 GHz in the 1.55 μm wavelength by adjusting the waveguide width. To further increase the distance between the two-defect cavities, the slow-light mode with group velocity of 0.0011c at the zero-dispersion point could be obtained. Besides, the slow-light waveguide can meet different requirements by selecting the appropriate width of waveguide.