光子晶体微腔中高偏振单偶极模的研究  

Design of high polarization and single-mode photonic crystal laser

作　　者：陈微[1] 邢名欣[1] 任刚[1] 王科[1] 杜晓宇[1] 张冶金[1] 郑婉华[1] 

机构地区：[1]中国科学院半导体研究所纳米光电子实验室,北京100083

出　　处：《物理学报》2009年第6期3955-3960,共6页Acta Physica Sinica

基　　金：国家高技术研究发展计划(批准号:2006AA03Z403);国家重点基础研究发展计划(批准号:2006CB921700);国家自然科学基金(批准号:60677046);国家自然科学基金重点项目(批准号:10634080)资助的课题~~

摘　　要：三角晶格排列的光子晶体微腔中的偶极模式是简并的,通过改变其晶格的对称性可以消除模式简并.晶格的整体形变破坏了晶格对称性从而影响光场的分布,同时还改变了电磁场的偏振分布.晶格整体形变使得简并的偶极模式分离成x极和y极偶极模式.通过计算分析发现分离后的模式具有良好的偏振特性,从而为实现单偏振光子晶体激光器提供了一种很好的途径.文中针对光子晶体薄板结构的微腔,主要计算了偶极模中x极偶极模式在不同拉伸时以及不同填充因子情况下的Q值,并分别计算了x极和y极偶极模式中辐射场的偏振特性,其中x极偶极模中得到的Ex与Ey分量的强度之比为44,y极偶极模中得到Ey与Ex分量的强度之比为27,故通过晶格的整体形变可以得到很好的高偏振单偶极模.The dipole mode in triangular photonic crystal single defect cavity is degenerate. By deforming the lattice in photonic crystal we can obtain non-degenerate dipole modes. Lattice deforming in the whole photonic crystal destroys the characteristic of symmetry, so the distribution of the electromagnetic field is affected and the polarization of the electromagnetic field is also changed. Lattice deforming divides the degenerate dipole mode into the x-dipole mode and the y-dipole mode. It is found that the non-degenerate modes have better properties of polarization. So the high polarization and single dipole mode photonic crystal laser can be achieved by deforming the lattice of photonic crystal. In this paper, we simulated the cavity in photonic crystal slab and mainly calculated tbe quality factor of x-dipole mode under different deforming conditions and with different filling factors. The properties of polarization of x-dipole and y-dipole modes are also calculated. It is found that the ratio of intensities of Ex to Ey in x-dipole mode and that of Ey to Ex in y-dipole mode are 44 and 27, respectively.

关 键 词：光子晶体 偶极模 品质因子 偏振度 

分 类 号：O734[理学—晶体学] TN929.11[电子电信—通信与信息系统]