调整圆弓形散射元参数实现低群速和低色散的慢光效应  

Slow Light Effect with Low Group Velocity and Low Dispersion by Adjusting Parameters of Cylinder-Segment Scatterers

作　　者：万勇[1] 付凯[1] 云茂金[1] 郭月[1] 夏临华[1] 

机构地区：[1]青岛大学物理科学学院,山东青岛266071

出　　处：《中国激光》2013年第1期163-169,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(11144007)资助课题

摘　　要：圆弓形散射元具有各向异性和多个可控自由度的特点。采用平面波展开方法,通过长轴微调、短轴变化和散射元转动几个方面,优化了光子晶体线性缺陷波导结构,实现了高群折射率和低色散的慢光效应并进行了模拟。结果表明,通过调整长轴和短轴变化,可以获得带宽在10.1～1.1nm,折射率为36.5～287.5的低色散慢光;通过散射元转动,可以获得带宽在11.4～0.8nm、折射率为45.5～293.7的低色散慢光。上述方法还可以获得超低色散和接近零色散效果的慢光。由此表明,选择合适的散射元和调整散射元参数,可以有效地实现高群折射率和低色散的慢光效应。As cylinder-segment scatters have the features of anisotropy and multiple controllable degrees of freedom. With the plane-wave expansion method, the slow light effect with high group refractive index and low dispersion can be generated by optimizing the structures of photonic crystal waveguide with line defect, such as changing the length of major axis or minor axis, or rotating scatterers relative to the direction of line defect. Simulation results show that slow lights with band width from 10.1 nm to 1.1 nm and group refractive index from 36.5 to 287.5 are achieved by changing the lengths of major axis or minor axis; slow lights with band width from 11.4 nm to 0.8 nm and group refractive index from 45. 5 to 293. 7 are gained by rotating scatterers. Moreover, slow lights with ultralow dispersion, even near zero dispersion, can also be obtained by scatterers and adjusting their parameters can efficiently achieve these methods, which shows that choosing suitable slow light effect with high group refractive index and low dispersion.

关 键 词：散射 圆弓形 散射元 慢光 色散 光子晶体 波导 

分 类 号：TN929.11[电子电信—通信与信息系统]