实现低损耗的慢光光子晶体波导结构的设计  

Low-loss slow light in photonic crystal waveguide

作　　者：潘玲[1] 汪丽春[1] 刘拥军[1] 

机构地区：[1]扬州大学物理科学与技术学院,江苏扬州225002

出　　处：《扬州大学学报（自然科学版）》2014年第4期39-42,共4页Journal of Yangzhou University：Natural Science Edition

基　　金：江苏省科技支撑计划项目(BE2009106)

摘　　要：基于三角晶格空气孔光子晶体波导,通过在传统的光子晶体单线缺陷薄板波导中加入硫系玻璃材料作为基底,设计了一种在实验中易实现且损耗较低的新型波导结构.运用三维平面波展开法(MPB)计算了不同基底厚度产生的能带结构、场分布以及损耗大小,通过对比分析,得到既能将损耗降到最小、同时又能实现慢光的理想基底厚度.在最优化的波导结构中,得到了损耗为15.4dB·cm-1,光速为0.04 c(c为真空中光速)的理想慢光,比传统波导28.7dB·cm-1的损耗降低约46.3%.Based on the triangular lattice air-hole photonic crystal, a new asymmetric structure with low loss that can be easily realized in experiment is proposed by adding the substrate of chalco- genideglass （Amtir） at the bottom of the traditional photonic crystal single line defected waveguides. Changing the thickness of Amtir substrate in this structure and using MIT Photonics Band （MPB） code, the author calculates their band structures, fields and losses. Through contras- rive analysis, an ideal thickness of substrate is found. By this ideal thickness, the new waveguide structure not only achieves a slow light, but also has a very low loss. In the optimization waveguide with Amtir substrate, an ideal slow light is obtained with the loss of 15.4 dB · cm ^-1 and the group velocity of 0.04 c, in contrast to a traditional waveguide loss of 28.7 dB · cm^-1. The new photonic crystal waveguide with Amtir substrate makes the loss decreased by 46.3%.

关 键 词：光子晶体 慢光 波导结构 损耗 三维平面波展开法 

分 类 号：O734[理学—晶体学]