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中文摘要：
为了消除光子晶体环形腔滤波器的多模特性，通过在环形腔的输出负载通道中引入点缺陷，提出了一种复合缺陷光子晶体滤波器结构。将线缺陷作为主波导，将环形腔和点缺陷相结合作为负载波导来实现对特定波长的滤波。分析了光子晶体整体介质柱折射率、点缺陷的折射率以及点缺陷的尺寸对滤波器滤波特性的影响。令m—r-point／r，由数值模拟分析得出，当m取0～0．6时，B端口输出的滤波波长值没有发生改变，而在m∈[0．6，1．8]的合理区间范围内，若改变点缺陷介质柱半径，则可实现滤波器的单纵模滤波和滤波特性的可调谐，这将对多通道滤波器结构的设计提供有效的理论参考。
英文摘要：
To eliminate the multimode property of the photonic crystal ring cavity filter, a composite defect photonie crystal filter structure combined point defect with ring cavity is proposed, in which the line defect is taken as the main waveguide and the load waveguide combining the point defect with the ring cavity is adopted to achieve the filtering for the certain wavelength. By changing the refractive index of the rods in the general photonic crystal structure, the refractive index of the point defect or the size of the point defect, the influences on the filtering property is analyzed. M is regarded as m=r-point/r, the numerical simulation result shows that the filtering wavelength will remain the same the filtering characteristic when m is varied from 0 to 0. 6, while m is in the reasonable range from 0. 6 to 1.8, the single longitudinal mode filtering characteristic and its tunability can be achieved by changing the point defect radius, which can make the effective theoretical reference for the design of multi-channel filter.
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