光子晶体波导慢光特性研究
关键词 光子晶体；群速度；群速度色散；慢光；平面波展开法
毕业论文设计说明书外文摘要
Title Characteristics of Slow Light in Photonic Crystal Waveguides
Abstract
Slow-light technology is a key technology for realizing optical buffers in all-optical networks. And it is an important way to achieve the technology in photonic crystals. Based on two-dimensional triangular lattice media column photonic crystal, Plane-Wave Expansion is adopt to simulate the performance of the light of the slow-light transmission properties of the waveguide, which concerns line defects and coupling defects. The result shows that the group velocity of the guided mode waveguide is reduced as the size of the defected column decreases in line defected waveguides. While in coupling defected waveguides, it is a little bit complex because the velocity is smaller and then larger as the size decreases. Finally, we studied a new defected waveguides in which the distance between the lines of the columns next to the line where defected column is can be changed. And then the proper value of the distance is determined with simulation. In such condition, the guided modes perform best. Combined with the group velocity dispersion，it shows that the GVD is in the order of 106 of the slow light region ,which ensures the efficient transmission of the light.
Keywords photonic crystals；group velocity；group velocity dispersion；slow light；Plane-Wave Expansion
目 录
1 引言 1
1.1 绪论 1
1.2 主要研究内容及结构安排 1
2 二文光子晶体的理论分析方法 2
2.1 几种常用的理论和数值方法 2
2.2 平面波展开法的推导 2
3 缺陷柱尺寸对慢光特性的影响 6
3.1 二文光子晶体线缺陷波导 6
3.2 二文光子晶体耦合缺陷波导 11
3.3 本章小结 15
4 缺陷行距相邻两行介质柱距离d对慢光特性的影响 17
4.1 距离d对线缺陷的影响 17
4.2 距离d对耦合缺陷结构的影响 19
4.3 本章小结 25
结 论 27
未来展望 28
致 谢 29
参考文献30
1 引言
1.1 绪论
1.1.1 光子晶体简介
光子晶体的概念是在1987年提出的，作为一种新的人工材料，它由多种不同介电常数的材料在空间作周期性排列形成。得益于光子晶体介质周期性结构，它会产生使得任何频率的光都无法在其中传播的带隙。如果我们再人为去破坏光子晶体中的介质周期性结构，便能够实现在带隙中出现平坦导模，并且其群速度较小，也就是说，实现了慢光[1~2]。
上一篇：多孔吸附材料抗辐射性能研究