利用平面波展开（PWE）法分析了慢光在由介质柱和空气背景构成的二维三角晶格光子晶体耦合微腔波导中的传播特性。数值模拟结果表明：随着缺陷腔之间距离的增大，导模的群速度减小很快；兼顾色散和损耗的影响，当相邻微腔间距两倍于晶格常数时，耦合微腔波导单位厚度(mm)透射比为47%，带宽为1.97 GHz，导模有效群折射率为22.4，通过对波导的群速度色散（GVD）特性进行分析，发现慢光区域的群速度色散的数量级低至10-2，具有较好的慢光特性，能够保证光波的高效传输。基于这种结构的耦合微腔波导提出了一种低损耗的光延迟器结构，计算表明该结构可实现的延迟时间为9.4 ps，光传输损耗低于1 dB。

An analysis on the transmission properties of the light in 2-D photonic crystal coupled cavity waveguide (CCW) with triangular lattice structured by columned media and air background is presentod using plane wave expansion (PWE) method. The numerical simulation results show that, the group velocity of the guide model decreases quickly with increasing the distance between the defect cavities. Considering both the dispersion and loss of the CCW, it was found that when the distance between the defect cavities is taken as double of the lattice constant, the transmittance per mm of the CCW, the bandwidth and the effective group refractive index would be 47%, 1.97 GHz and 22.4, respectively. The property of group-velocity dispersion (GVD) of the slow light was analyzed. It is found that the magnitude of the GVD value in the area of slow light is 10-2, meaning that the structure has the best slow-light characteristic and allow the slow light propagate efficiently. Based on this CCW structure a low loss optical delayer was proposed, the calculation results show that this delayer is able to achieve a delay time of 9.4 ps and a loss of lower than 1 dB.