含梯度折射率缺陷的一维光子晶体滤波性能研究

J4 ›› 2016, Vol. 33 ›› Issue (5): 573-577.

含梯度折射率缺陷的一维光子晶体滤波性能研究

徐波波,郑改革,吴义根

南京信息工程大学物理与光电工程学院，南京江苏 210044

收稿日期:2015-07-07 修回日期:2015-09-25 出版日期:2016-09-28 发布日期:2016-09-28
通讯作者: 郑改革 (1984-)，男，江苏，副教授，博士，主要从事纳米光电子材料与器件的研究。 E-mail:jsnanophotonics@yahoo.com
作者简介:国家自然科学基金 the National Natural Science Foundation of China (Grant No. 61203211) 江苏省自然科学基金 the Natural Science Foundation of the Jiangsu Province (Grant No. BK20141483).

Filtering characteristics of one-dimensional photonic crystal with gradient refractive index defects

XU Bobo, ZHENG Gaige, WU Yigen

College of Physical and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China

Received:2015-07-07 Revised:2015-09-25 Published:2016-09-28 Online:2016-09-28

摘要/Abstract

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，可以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。研究了缺陷层的折射率变化为抛物线型时对应的透射率谱线，并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。研究表明，增加折射率比，含梯度折射率缺陷层的一维光子晶体可以实现更大的滤波带宽；改变厚度比，可以影响透射峰位置；改变周期数，则可以影响透射率。这一研究结果对提高光子晶体滤波器性能具有一定参考价值。

关键词: 一维光子晶体；滤波特性；梯度折射率缺陷层；折射率比；厚度比；周期数

Abstract: To achieve the superior filtering characteristics of one-dimensional photonic crystal, the gradient refractive index of defect layer is introduced to inhibit certain frequency of electromagnetic wave and get the photonic band gap. Maxwell's equations were solved strictly with the finite difference time domain (FDTD) method. Discuss the corresponding transmission spectrum when changes in the refractive index of defect layer are parabolic. And analysis the impact of the refractive index ratio, thickness ratio and the cycle number of periodic dielectric layer on the filtering characteristics. Research shows that defect layer with gradient index of the one-dimensional photonic crystal has a wider bandwidth when we increase the refractive index ratio; changing the thickness ratio can affect position of the transmission peak; changing the periodic number, may influence the transmittance. Results of this study have some reference values to improve the performance of photonic crystal filters.

Key words: one-dimensional photonic crystal; filtering characteristics; gradient refractive index of defect layer; refractive index ratio; thickness ratio; periodic number

中图分类号:

O439

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研究[J]. J4, 2016, 33(5): 573-577.

XU Bobo, ZHENG Gaige, WU Yigen. Filtering characteristics of one-dimensional photonic crystal with gradient refractive index defects[J]. J4, 2016, 33(5): 573-577.

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