光子晶体耦合腔光波导慢光结构特性研究

研究了用于光缓存的光子晶体耦合腔光波导的结构对慢光传输特性的影响.详细讨论了微腔间距关于波导禁带、导模带宽、导模传输群速度的具体关系.计算发现,随着微腔之间距离的增加导模显著平坦化,群速度急剧减小.当相邻微腔之间距离为7个晶格常数时,获得了小于2×10~(-4)c的超小群速度.通过长度为13.23 μm的7×7超胞构成的光子晶体耦合腔光波导,产生的最大光延迟超过了400 ps,这比相同长度传统光波导产生光延迟大四个数量级.

Investigation on Structure Properties of Slow Light in Photonic Crystal Coupled Resonator Optical Waveguide

The significant effect factor of slow light transmission in photonic crystal coupled resonator optical waveguide is investigated.The change tendency of guided mode band,group velocity and group delay with the tuning of distance between neighboring cavities are discussed.The guided mode is flattened clearly and the group velocity decreases sharply with the increasing of cavities distance.When the interval between contiguous cavities is 7 lattice constants of photonic crystal,the ultra small group velocity below 2×10~(-4)c is obtained.This is roughly two orders of magnitude smaller than that in line defect PC waveguide.The maximal group delay through CROW of 13.23 μm with supercell 7×7 exceeds 400 ps,which are four orders of magnitude larger than that in traditional waveguide with the same length.