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研究了二维光子晶体耦合腔波导的结构对慢光特性的影响,发现微腔间的距离n、填充因子r/a和缺陷柱的尺寸rd是影响光子晶体禁带中慢光导模传输特性的重要参数。随着缺陷微腔间距离的增加,导模群速度vg急剧减小;当填充因子和缺陷柱尺寸增加时,导模向低频方向移动,同时,导模群速度降低;填充因子和缺陷柱尺寸降到一定数值后,vg达到最小值,此后,当r和rd分别超出其特定值继续增大,导模群速度反而增大。取微腔之间介质柱个数为6,普通介质柱尺寸为r=0.22a,a为光子晶体晶格常数,缺陷柱尺寸为rd=0.12a,得到导模群速度最大值vgmax<1.93×10-3c,带边处vg<10-4c(c为光速)。这一结果显示,通过基本结构设计可以实现对光子晶体耦合腔光波导中慢光的有效控制,这将为基于光子晶体功能器件的设计和应用提供有效的支持。
The effect of the structure of two-dimensional photonic crystal waveguide cavity on the slow-light properties was studied. It was found that the distance between microcavities n, the fill factor r / a, and the size of the defect column rd are the influences of the transmission characteristics of the slow- Important parameters. With the increase of the distance between the defects, the vg of the guided mode group decreases sharply. When the fill factor and the size of the defective column increase, the guided mode moves to the low frequency, and the velocity of the guided mode group decreases. The fill factor and the size of the defective column After falling to a certain value, vg reaches a minimum value. Thereafter, when r and rd respectively exceed their specific values and continue to increase, the guide mode group velocity increases instead. The number of dielectric columns in the microcavity is taken as 6, the common dielectric column size is r = 0.22a, a is the photonic crystal lattice constant, the defect column size is rd = 0.12a, the maximum vgmax of the guided mode group is less than 1.93 × 10-3c, with edge vg <10-4c (c is the speed of light). This result shows that the effective control of the slow light in the photonic crystal coupled cavity optical waveguide can be achieved through the basic structural design, which will provide effective support for the design and application of the photonic crystal functional device.