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以二维三角晶格介质柱光子晶体线缺陷波导为研究对象,通过平面波展开(PWE)法对光在波导中传输时的慢光特性进行了仿真分析,发现光子晶体的填充因子以及线缺陷中的柱子半径大小决定了慢光导模在光子带隙中的传输特性。随着填充因子的增大,光子晶体波导的导模群速度迅速减小。缺陷柱的半径大小对导模群速度的影响要强于填充比。通过调整填充因子和缺陷柱半径.得到了导模群速度小于0.01c的波导结构。结合慢光导模的群速度色散(GVD)特性分析,发现极慢光区域的GVD值位于10~5～10~6量级,能够保证光的高效传输。
Taking the 2D photonic crystal lattice defect waveguide of two-dimensional triangular lattice medium as the research object, the slow-light characteristics of light propagating through the waveguide were analyzed by the plane wave expansion (PWE) method. It was found that the fill factor of the photonic crystal and the line defect The radius of the pillar determines the propagation characteristics of slow photoconductors in the photonic bandgap. With the increase of fill factor, the guided mode group velocity of photonic crystal waveguide decreases rapidly. Defect column radius of the guide mode group velocity greater than the filling ratio. By adjusting the fill factor and the radius of defect column, the waveguide structure with guided mode group velocity less than 0.01c was obtained. Combined with the analysis of GVD characteristics of slow light guide mode, we found that the GVD value in very slow light region is on the order of 10 ~ 5 ~ 10 ~ 6, which can ensure the efficient transmission of light.