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三角晶格排列的光子晶体微腔中的偶极模式是简并的,通过改变其晶格的对称性可以消除模式简并.晶格的整体形变破坏了晶格对称性从而影响光场的分布,同时还改变了电磁场的偏振分布.晶格整体形变使得简并的偶极模式分离成x极和y极偶极模式.通过计算分析发现分离后的模式具有良好的偏振特性,从而为实现单偏振光子晶体激光器提供了一种很好的途径.文中针对光子晶体薄板结构的微腔,主要计算了偶极模中x极偶极模式在不同拉伸时以及不同填充因子情况下的Q值,并分别计算了x极和y极偶极模式中辐射场的偏振特性,其中x极偶极模中得到的Ex与Ey分量的强度之比为44,y极偶极模中得到Ey与Ex分量的强度之比为27,故通过晶格的整体形变可以得到很好的高偏振单偶极模.
The dipole modes in the triangular lattice-arranged photonic crystal microcavities are degenerate and the mode degeneracy can be eliminated by changing their lattice symmetry. The overall deformation of the lattice disrupts the lattice symmetry and hence the distribution of the light field , While also changing the polarization distribution of the electromagnetic field.General deformation of the lattice makes the degenerate dipole mode separated into x-pole and y-pole dipole mode.After calculation and analysis, it is found that the separated mode has good polarization characteristics, so as to realize single Polarimetric photonic crystal lasers provide a good way.In this paper, for the microcavity of photonic crystal thin plate structure, the Q value of the dipole mode in different dip and different fill factors is mainly calculated, And the polarization characteristics of the radiation field in the x-pole and y-pole dipole modes are respectively calculated. The ratio of the intensities of the Ex and Ey components in the x-pole dipole mode is 44, and the Ey and Ex components in the y-pole dipole mode The ratio of the intensity of 27, so through the lattice deformation can get a good overall high polarization single-dipole mode.