光子晶体光纤前向布里渊散射现象中的声波带隙特性

Acoustic Band Gap Properties of the Forward Brillouin Scattering Phenomenon in Photonic Crystal Fibers

利用平面波展开方法,对光子晶体光纤的前向布里渊散射现象中的声波带隙特性进行了数值仿真.结果表明,对于较为常见的空气孔排列为六角密排结构、空气孔形状为圆形的实芯光子晶体光纤,只有当空气孔的填充率大于一定阈值时才出现较明显的XY模态声波的带隙,并且最低与次低带隙的上下边界均随空气孔的填充率的增大而下降.根据所得结果讨论了在这种类型的光子晶体光纤中空气孔的填充率对前向布里渊散射强度的影响.

Acoustic band gap properties of the forward Brillouin scattering phenomenon in photonic crystal fibers are simulated by using plane wave expansion method. The results shown that, for the typical kind of photonic crystal fibers with hexagonally arrayed circular air holes, the band gap of acoustic wave of XY mode appears only when the air holes＇ filling rate is greater than certain threshold value, and the upper and lower boundary values of the band gap decrease with the increasing of the air holes＇ filling rate. The influence of air holes＇ filling rate on the intensity of forward Brillouin scattering is discussed according to the simulation results.