光学学报, 2015, 35 (4): 0416002, 网络出版: 2015-04-03
椭圆柱微腔光子晶体耦合腔波导的慢光特性研究
Research of Slow Light Performances of Photonic Crystal Coupled Resonator Optical Waveguides Formed by Oval Rods Cavities
材料 慢光 缓存能力 光子晶体 耦合腔光波导 materials slow light buffer capability photonic crystal coupled resonator optical waveguide
摘要
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。
Abstract
Slow light propagation and improved performance buffering properties are obtained from photonic crystal coupled resonator optical waveguides formed by enlarged and oval rods surrounded cavities. As the radius of bulk circular rods is 0.25a (a is a lattice constant) and radius of enlarged rods is 0.35a, the group velocity of guided mode less than 2.37×10-4c (c is the light speed in the vacum) is obtained. Compared with that in homogeneous rods cavity waveguide, the maximum group velocity decreases one order magnitude. Simultaneously, buffer capacity decreases as well. Considering the buffer performances, the enlarged rods are developed into ovals to further improve the slow light properties and buffer performances. When the long axis of oval rods is 0.42a and short axis is 0.20a, the group velocity of guided mode less than 2.3053 × 10- 4c is obtained, and the buffer capacity arrives at 9.8214 bit. Q factor also reaches the maximum value 3575.1.
李长红, 万勇, 毛强明. 椭圆柱微腔光子晶体耦合腔波导的慢光特性研究[J]. 光学学报, 2015, 35(4): 0416002. Li Changhong, Wan Yong, Mao Qiangming. Research of Slow Light Performances of Photonic Crystal Coupled Resonator Optical Waveguides Formed by Oval Rods Cavities[J]. Acta Optica Sinica, 2015, 35(4): 0416002.