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采用大介质柱和椭圆介质柱环绕微腔结构构成光子晶体耦合腔光波导(PC-CROW),在获得慢光的同时,其缓存特性也获得了提高。当普通介质柱半径为0.25a(a为光子晶体晶格常数),环绕微腔圆形大介质柱半径为0.35a时,得到小于2.37×10-4c(c为真空中的光速)的导模群速度,这比均匀介质柱微腔波导的最大群速度减小了一个数量级,存储容量也有所下降;考虑到缓存性能,为了进一步改善PC-CROW的慢光性能和缓存特性,将环绕微腔大介质柱椭圆化,在椭圆长轴为0.42a,短轴为0.20a时,获得导模群速度小于2.3053×10-4c,存储容量达到9.8214 bit,品质因子Q也达到了最大值3575.1。
The PC-CROW photonic crystal waveguide (PC-CROW) is formed by surrounding the microcavity with a large dielectric column and an elliptical dielectric column. As the slow light is obtained, its buffering characteristics are also improved. When the radius of common dielectric column is 0.25a (a is the lattice constant of photonic crystal) and the radius of circular microcapillary circular medium is 0.35a, the guided mode is obtained, which is less than 2.37 × 10-4c (c is the speed of light in vacuum) Group velocity, which is one order of magnitude lower than the maximum group velocity of the microcavity waveguide in a homogeneous dielectric column and reduces the storage capacity. In order to further improve the slow light performance and the buffer performance of the PC-CROW in consideration of the buffer performance, When the long axis of ellipse is 0.42a and the short axis is 0.20a, the velocity of guided mode group is less than 2.3053 × 10-4c, the storage capacity reaches 9.8214 bit, and the quality factor Q also reaches the maximum of 3575.1.