光子晶体波导慢光特性研究  

Slow-Light Characteristics of Photonic Crystal Waveguides

作　　者：曲连杰[1] 杨跃德[1] 黄永箴[1] 

机构地区：[1]中国科学院半导体研究所集成光电子学国家重点联合实验室,北京100083

出　　处：《光学学报》2011年第1期172-177,共6页Acta Optica Sinica

基　　金：国家973计划(2006CB302804);国家自然科学基金(60777028;60723002;60838003)资助课题

摘　　要：基于二维三角晶格空气孔光子晶体,通过在光子晶体单线缺陷波导两侧引入不同的耦合腔,设计了慢光特性较好的波导结构。利用平面波展开法计算波导的色散曲线,并分析慢光模式的群速度和群速度色散特性。耦合腔采用单缺陷腔时,适当调节波导宽度可以获得在零色散点群速度为0.0128c的慢光模式,对应在1.55μm波长处的带宽为409GHz。耦合腔采用长轴与波导方向呈60°的双缺陷腔,在超原胞大小为4a×9b(a,b分别为光子晶体在x,y方向的周期)时,通过调整波导宽度,可以获得在零色散点群速度为0.0070c的慢光模式,对应在1.55μm波长处的带宽为226GHz。进一步增大沿波导方向上双缺陷腔之间的距离,可以获得在零色散点群速度为0.0011c的慢光模式。同时可以根据具体情况选择合适的波导宽度参数,设计满足不同要求的慢光波导结构。Based on two-dimensional triangular lattice air-hole photonic crystal,a kind of waveguide structure with good slow-light characteristics is proposed by inducing coupled-cavity on both sides of the photonic crystal single-line defected waveguides.The energy-band structure,group velocity and group-velocity dispersion characteristics of slow-light mode are analyzed by plane wave expansion method.For the waveguide structure using single-defect cavity as coupled cavity,the group velocity of 0.0128c at the zero-dispersion point with the bandwidth of 409 GHz in the 1.55 μm wavelength could be obtained by appropriately adjusting the waveguide width.As for the waveguide structure using two-defect cavity as coupled cavity with the super-cell of 4a×9b,the group velocity can reach 0.0070c at the zero-dispersion point with the bandwidth of 226 GHz in the 1.55 μm wavelength by adjusting the waveguide width.To further increase the distance between the two-defect cavities,the slow-light mode with group velocity of 0.0011c at the zero-dispersion point could be obtained.Besides,the slow-light waveguide can meet different requirements by selecting the appropriate width of waveguide.

关 键 词：光通信 光子晶体波导 平面波展开法 慢光 零色散点 

分 类 号：TN929.11[电子电信—通信与信息系统]