二维旋转直柱光子晶体的频率带隙结构分析  

The photonic frequency band structure of a two-dimensional photonic crystals ofsquare lattice with rotating square cylinders

作　　者：翦知渐[1] 彭景翠[1] 周仁龙[1] 张高明[1] 

机构地区：[1]湖南大学光电子材料研究所,湖南长沙410082

出　　处：《功能材料》2006年第10期1587-1589,1592,共4页Journal of Functional Materials

基　　金：教育部博士点基金资助项目(20030532008)

摘　　要：设计了一种二维方形旋转正四边形直柱光子晶体,利用平面波展开方法计算了其光子频率带结构,发现在低频和高频区域,该类光子晶体的光子频率禁带明显增大。计算了空气中Al材料的旋转四边形直柱光子晶体的带结构和态密度,当填充比等于0.5时存在绝对带隙,旋转角度为45°时绝对带隙最大,旋转角度为0时,光子频率禁带位于高频区域。利用FDTD方法检验了计算结果,并分析了旋转角度为45°时,正四边形直柱光子晶体的波导特性以及TM模的电场分布。Designed a two-dimension photonic crystal of square lattice with rotating square cylinders, calculated their frequency band structures for this kind of photonic crystal and found existing a large absolute band gap in the low and high frequency regions by using the pl.ane wave expansion method. The photonic band structure and density of state of a two-dimensional photonic crystals of square lattice with Al rotating square cylinders in air have been calculated. It exists a maximum absolute PBG for f=0.5 and when rotating angle θ= 45°, and the absolute PBG lies in the high frequency range for θ= 0°. Furthermore, the FDTD（finite-different time-domain） method was used to examining the numerical results and analyzing the waveguide characteristics and its electric field distribution of TM mode for θ= 45°.

关 键 词：光子晶体 光子频率带结构 绝对带隙 

分 类 号：O431.2[机械工程—光学工程]