摘要
提出了方形二维光子晶体的结构,并引入缺陷形成耦合腔波导和线缺陷波导。应用时域有限差分(FDTD)法研究其传输特性,结果表明对于耦合腔波导,当缺陷周围介质柱直径变化时,第一光子禁带中会出现宽频缺陷模。并且当介质柱直径减小时,缺陷模会向高频移动,而导模宽度则会有规律地扩展或者缩小。在线缺陷波导中,逐渐减小缺陷两侧介质柱的直径或介电常数,发现导带向高频移动,并且带宽逐渐减小。
We have constructed a square two-dimensional photonic crystal and, based on this structure, we have designed a coupling cavity waveguide and line defect waveguide by removing some dielectric cylinders. By using the finite difference time domain method, we studied their transmission properties. The results showed that there were some broadband defect modes in the first band gap when the diameters of the cavity waveguide were varied. The defeet modes changed in a regular manner as the diameter of the dielectric cylinder was gradually decreased. When the diameter or dielectric constant of the cylinders was gradually decreased, the complete band gap of the line defect waveguide moved to higher frequency and its range gradually decreased.
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第2期118-122,共5页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
关键词
光子晶体
二维
耦合腔
线缺陷
photonic crystals
two dimensional
coupling cavity
line defect
