量子电子学报, 2016, 33 (5): 573, 网络出版: 2016-10-21  

含梯度折射率缺陷的一维光子晶体滤波性能

Filtering characteristics of one-dimensional photonic crystal with gradient refractive index defects
作者单位
南京信息工程大学物理与光电工程学院, 江苏 南京 210044
摘要
为实现一维光子晶体更优越的滤波特性引入渐变折射率缺陷层,可抑制某些特定频率的电磁波, 产生光子禁带。利用时域有限差分(FDTD)法严格求解麦克斯韦方程组,研究了缺陷层折射率变化为 抛物线型时对应的透射率谱线,分析了周期介质层的折射率比、厚度比及周期数对滤波性能的影响。 结果表明:增加折射率比,含梯度折射率缺陷层的一维光子晶体可实现更大的滤波带宽;改变厚度比 可影响透射峰位置;改变周期数可影响透射率。研究结果对提高光子晶体滤波器性能具有一定参考价值。
Abstract
In order to achieve the superior filtering characteristics of one-dimensional photonic crystal, the gradient refractive index defect layer is introduced, which can suppress electromagnetic wave of certain frequency and generate the photonic band gap. The finite difference time domain (FDTD) method is used to solve Maxwell equations. The corresponding transmission spectrum lines are studied when the refractive index of defect layer is parabolic. Influences of the refractive index ratio, thickness ratio and cycle number of periodic dielectric layer on the filtering characteristics are analyzed. Results show that a wider filter bandwidth of one-dimensional photonic crystal with gradient refractive index defect layer can be realized by increasing the refractive index ratio. The transmission peak position is affected by changing thickness ratio, and the transmittance is affected by changing the periodic number. Research results have a certain reference value for improving the performance of photonic crystal filters.

徐波波, 郑改革, 吴义根. 含梯度折射率缺陷的一维光子晶体滤波性能[J]. 量子电子学报, 2016, 33(5): 573. XU Bobo, ZHENG Gaige, WU Yigen. Filtering characteristics of one-dimensional photonic crystal with gradient refractive index defects[J]. Chinese Journal of Quantum Electronics, 2016, 33(5): 573.

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