液晶缺陷阶梯型Fibonacci第七代结构的特性研究  

Study on the Characteristics of the Seventh Generation of Liquid Crystal Defective Ladder-type Fibonacci

作　　者：廖昆 王斌 许彪 徐海龙 

机构地区：[1]萍乡学院机械电子工程学院,江西萍乡337000

出　　处：《萍乡学院学报》2017年第6期55-58,62,共5页Journal of Pingxiang University

摘　　要：设计了一种向列相液晶染料缺陷一维阶梯型Fibonacci第七代光子晶体结构,利用传输矩阵法数值仿真了该结构的电场方向及增益特性。计算了引入缺陷前后的透射谱,分析了有增益和无增益时,缺陷模随外加电场方向的夹角θ的变化关系和增益系数对缺陷模透射率大小的影响。结果表明:引入缺陷后,该结构的光子禁带范围变宽,并且在禁带区域两端的波长分别向短波和长波方向移动。引入增益系数后,当夹角θ的变大时,缺陷模的空间位置会向短波方向一侧偏移,但是,缺陷模波长的空间位置并没有发生改变,仅仅改变了其大小;在夹角θ为(0°~90°)时,该结构缺陷模波长的空间位置的变化量为13.1nm。当增益系数Co变大时,不同缺陷模波长对应的透射率大小都是先增大后减小的过程。A novel one-dimensional Fibonacci seventh-generation photonic crystal structure with nematic liquid crystal dye defects is designed.The transfer matrix method is used to simulate the electric field direction and gain characteristics of the structure.The transmission spectrum before and after the introduction of the defect is calculated.The influence of the variation of the included angle θ between the defect mode and the applied electric field and the gain coefficient on the transmissivity of the defect mode are analyzed.The results show that the photonic band gap of this structure is broadened and the wavelengths at the two ends of the forbidden band are shifted to the shortwave and longwave respectively.After the gain coefficient is introduced,the spatial position of the defect mode will be shifted toward the short-wave side when the included angle θ becomes larger.However,the spatial position of the defect mode wavelength does not change with only its size changed.When θ is（0° to 90°）,the amount of change in the spatial position of the defect mode wavelength of the structure is 13.1 nm.When the gain coefficient Co becomes larger,the transmissivity corresponding to different defect mode wavelengths first increases and then decreases.

关 键 词：阶梯型Fibonacci准周期结构 液晶染料 缺陷模 增益系数 传输矩阵法 

分 类 号：O436[机械工程—光学工程]