局部准周期光子晶体及其缺陷模式分析  

Defect-Mode Properties of Photonic Crystals Constructed with a Portion of Photonic Quasicrystals

作　　者：沈云[1] 于国萍[2] 傅继武[1] 邹林儿[1] 范定寰[1] 

机构地区：[1]南昌大学物理学系,江西南昌330031 [2]武汉大学物理科学与技术学院,湖北武汉430072

出　　处：《光学学报》2011年第6期242-245,共4页Acta Optica Sinica

基　　金：国家自然科学基金(60967003);江西省自然科学基金(2010GQW0044);南昌大学科学基金(Z03355)资助课题

摘　　要：利用时域有限差分方法(FDTD)研究了由十二重准周期光子晶体(PQ)局部结构组成的复合二维(2D)光子晶体(PC)及其点缺陷的光学特性。结果表明,由于准周期光子晶体局部结构平移对称性缺失,该复合光子晶体可以通过改变缺陷位置来调节缺陷模的特性,由此具有比周期光子晶体更为丰富的缺陷模式及更灵活的调节方式。同时,研究表明,缺陷模频率与所去除介质柱之间的相互影响强弱具有关联性。通过不同点缺陷腔的组合可以进一步获得灵活多样的缺陷模式。Complex two-dimensional （2D） photonic crystal （PC） constructed with a portion of 12-fold photonic quasicrystals （PQ） is proposed and its defect-mode properties are studied by performing finite-difference time-domain （FDTD）. The results show that such complex PC allow for richer defect modes and higher degree of flexibility compared with conventional periodic PCs due to the absence of translational symmetry in the portion of 12-fold PQ. It is also demonstrated that the frequencies of defect modes are related to the strength of the interplay of the removed cylinders. The defect modes of flexibilitv and tunability can be obtained by combining different defect cavities.

关 键 词：集成光学 复合光子晶体 时域有限差分 缺陷模式 

分 类 号：O753[理学—晶体学]