激光与光电子学进展, 2018, 55 (5): 053103, 网络出版: 2018-09-11
金属薄膜的缺陷模对一维光子晶体滤波特性的影响 下载: 1246次
Influence of Defect Modes of Metal Films on Filtering Characteristics of One-dimensional Photonic Crystals
薄膜 光子晶体 滤波器 缺陷 时域有限差分法 thin films photonic crystals filter defect finite-difference time-domain method
摘要
采用时域有限差分(FDTD)法,对由银-氧化铟锡(ITO)薄膜构成的一维光子晶体结构在300~800 nm波段范围内的滤波特性进行了研究。仿真研究了金属缺陷层厚度、入射角度和ITO膜厚度等对光子晶体滤波特性的影响。对不同参量下光子晶体结构的色散曲线也进行了仿真计算,并分析了色散机理。结果表明,改变缺陷层的厚度能够调制光子晶体的滤波范围及滤波波形;入射光线小角度范围(0°~20°)内的变化对该光子晶体滤波性能的影响甚微;随着ITO膜厚度的增加,滤波波谱呈周期性变化。
Abstract
The filtering characteristic of the one-dimensional photonic crystal structure composed of Ag-ITO thin films in the spectral range of 300-800 nm is investigated by the finite difference time domain method. The influences of metal defect layer thickness, incident angle, and ITO film thickness on filtering characteristics of photonic crystals are simulated. The dispersion relationships of the photonic crystal under different parameters are simulated and calculated, and the corresponding mechanisms are analyzed. The results indicate that, the filtering range and filtering waveform of the photonic crystal can be modulated by tuning defect layer thickness. The change of the incident light in the small angle range (0°-20°) has little influence on the filtering performance of the photonic crystal. With the increase of ITO film thickness, the filtering spectrum shows a periodic change.
刘圆圆, 李旭峰, 赵亚丽, 彭伟, 杨雯. 金属薄膜的缺陷模对一维光子晶体滤波特性的影响[J]. 激光与光电子学进展, 2018, 55(5): 053103. Yuanyuan Liu, Xufeng Li, Yali Zhao, Wei Peng, Wen Yang. Influence of Defect Modes of Metal Films on Filtering Characteristics of One-dimensional Photonic Crystals[J]. Laser & Optoelectronics Progress, 2018, 55(5): 053103.