二维八重准晶有机光子晶体平板的光学传播特性  

Light Propagation in Two-Dimensional Organic Octagonal Quasiperiodic Photonic Crystal Slabs

作　　者：梁馨元[1] 陈笑[1] 王义全[1] 冯帅[1] 杨国建[1] 陈胥冲[1] 

机构地区：[1]中央民族大学理学院,北京100081

出　　处：《光学学报》2013年第1期164-168,共5页Acta Optica Sinica

基　　金："985"工程(98507-010009;98504-012004);"211"工程;国家自然科学基金(11204387);教育部科技研究重点项目(212205)资助课题

摘　　要：采用时域有限差分法研究了二维八重准晶有机光子晶体的光传输特性,重点分析了光束在聚苯乙烯空气柱平板结构和聚苯乙烯介质柱结构中的透射特性与光局域特性。研究结果表明,即使在低折射率对比度的情况下,两种完整八重准晶平板结构中均出现了可见光波段的光子带隙和本征模,且光子带隙中心位置随着平板厚度的增大而红移。当在两种准晶结构中引入缺陷微腔时,带隙内的缺陷模产生位置和波长红移特性随着微腔结构的变化规律明显不同,这种差异性是由两种物理机制(即光子晶体缺陷能级变化与微腔所支持的驻波条件)共同作用的结果。这一研究结果将为实验制备有机准晶发光器件提供一定的理论基础。Light propagation in photonic band gaps in two-dimensional organic octagonal quasiperiodic photonic crystal slabs is investigated by finite-difference time-domain method.The transmission property and light localization in the polystyrene air-rod slab and air polystyrene-rod slab are compared in detail.The results show that even in extremely low-index dielectric contrast of rods,the photonic band gaps and eigenmodes are observed in the visible spectrum.Besides,the central position of bandgap is red-shifted with the increase of slab thickness.When defects are introduced into two quasiperiodic structures,the occurrence position of defect modes and property of red-shifting in wavelength of modes are different with the increase of size of defect nanocavities.The difference in property originates from the competition consequence of two physical mechanisms which are the energy levels of defects in photonic crystals and the resonance of modes in the defect cavity.The results may give theoretical support for fabricating luminescent devices based on organic quasicrystals.

关 键 词：材料 光子晶体 八重准晶 光子带隙 有机聚苯乙烯 

分 类 号：TN256[电子电信—物理电子学]