光子晶体环形谐振腔大角度超微多路光分束器的设计  

Design of Large Separating Angle Ultracompact Multiway Beam Splitter Based on Photonic Crystal Ring Resonators

作　　者：郭浩[1] 吴评[1] 于天宝[1] 廖清华[1] 刘念华[1] 黄永箴[2] 

机构地区：[1]南昌大学物理系,江西南昌330031 [2]中国科学院半导体研究所集成光电子学国家重点实验室,北京100083

出　　处：《光学学报》2010年第5期1501-1505,共5页Acta Optica Sinica

基　　金：集成光电子国家重点实验室(半导体研究所)开放课题;江西省教育厅科学研究课题(2007-59;GJJ08066);江西省自然科学基金(2008GZW0006;2007GQW2057)资助课题

摘　　要：将环形谐振腔邻近放置在光子晶体直波导两侧构成环形谐振器,利用平面波展开法及时域有限差分法,数值分析了该系统中光的传播行为。基于此结构,以三、四通道为例设计了大角度超微多路光分束器。仅通过改变环形谐振腔中耦合介质柱的半径,便可使光场发生重新分布,实现输出能量的均分或自由分配。在同样保证多路和高传输效率的条件下,该结构与常规波导定向耦合型分束器相比,还可实现光束的大角度分离。Photonic crystal ring resonator can be constructed by putting ring resonators and the waveguides next together.The spectral transmittance and propagation of the optical field entering this system is analyzed numerically using the plane-wave expansion（PWE） method and finite-difference time-domain（FDTD） method.On the basis of this structure,ultracompact multiway beam splitter was designed and the ones with three and four output channels are discussed in details as examples.By simply tuning the radii of coupling dielectric rods in the ring resonators and inducing the redistribution of the optical field,equipartition of energy or free distribution can be achieved.Compared with the results of normal waveguides reported,the most important aspect is that a large separating angle can be obtained in this structure.

关 键 词：光子晶体 分束器 环形谐振腔 时域有限差分法 平面波展开法 能量均分 

分 类 号：O439[机械工程—光学工程]