通过改变最内层两排空气孔的半径,研究了Ge20Sb15Se65硫基光子晶体平板波导的宽带慢光特性。利用三维平面波展开法,通过计算得到波导的能带结构、群折射率和色散,并分析了它们与内层空气孔半径大小的关系。同时优化第一层和第二层空气孔的半径大小,得到了群速度色散为零的对称型硫系光子晶体波导结构,并在20%的变化范围内获得大小分别为125、40和18的群折射率,对应通信波长处的带宽分别为1.7、5.6、9.7 nm,并讨论了折射率对光子晶体波导慢光性能的影响。并为高非线性、低色散的宽带慢光硫基光子晶体平板波导器件的设计及制备提供了理论基础。 The broadband slow-light properties of Ge20Sb15Se65 S-based photonic crystal slab waveguide were investigated by changing the radii of two rows of air holes in the innermost layer. Using the 3D plane wave expansion method, the energy band structure, group refractive index and dispersion of the waveguide were calculated and their relationship with the radius of the inner air hole was analyzed. At the same time, the radius of the first and second air holes is optimized, and a symmetric sulfur-based photonic crystal waveguide structure with a group velocity dispersion of zero is obtained, and the sizes of the photonic crystal waveguide with sizes of 125, 40 and 18 The refractive index of the group and the bandwidth of the corresponding communication wavelength are 1.7, 5.6 and 9.7 nm, respectively. The influence of the refractive index on the slow optical performance of the photonic crystal waveguide is also discussed. It also provides a theoretical basis for the design and fabrication of high nonlinear, low dispersion wideband slow photoluminescence photonic crystal slab waveguide devices.