摘要
采用传输矩阵法分别模拟了缺陷层厚度、入射角度和膜厚微扰的变化对含空气缺陷的一维光子晶体滤波特性的影响.研究表明:对于空气厚度可调结构,在考虑色散的情况下,空气厚度每增加2nm透射波长相应向长波方向移动约2nm,二者基本呈1∶1的线性关系;对于入射角度可调结构,与正入射相比较,入射角度从0°到89°变化时,其全角度禁带分别减小了105nm(TE模)、600nm(TM模),TM模禁带受角度的变化影响较大;入射角从0°分别变化到16.9°(TE模)、17.0°(TM模)时实现C波段的可调滤波.同一周期内,两种材料的模厚误差的相互弥补,能够实现小范围的膜厚扰动不敏感,缩小实际滤过峰值与理论值的偏差,可降低制备光子晶体的难度.
The filtering characteristics of one-dimensional photonic crystal with an air defect layer were investigated using transfer matrix method as the thickness of defect,incident angle and thickness perturbation changing.The studies suggest：For air thickness adjustable structure,considering the dispersion of the materials,the increase of 2nm for the air thickness makes the transmission peak shift about 2nm to the long-wave direction,which shows a linear relationship of 1∶1;For incident angle adjustable structure,compared with the normal incidence,when the incident angle change from 0°to 89°,the omnidirectional photonic bandgap decrease 105nm（TE mode）、600nm（TM mode）respectively;which shows that TM mode band gap are greatly influenced by the change of incident angle;it can realize the tunable filter in C band when the incident angle varies from 0°to 16.9°（TE mode）and 17.0°（TM mode）respectively.In the same period,the mutual remedying of thickness error of two materials can realize insensitivity to thickness perturbation in small range,which can narrow the deviation between the actual peaks and theoretical peaks to reduce the difficulty of the fabrication of photonic crystal.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2015年第8期154-161,共8页
Acta Photonica Sinica
基金
国家自然科学基金(Nos.61340053,61307069)
山西省自然科学基金(No.2013011007-1)
北京邮电大学基金(No.IPOC2013A001)资助
关键词
一维光子晶体
传输矩阵法
可调谐光滤波器
膜厚微扰
光子禁带
透射谱
One-dimensional photonic crystal
Transfer matrix method
Tunable optical filter
Thickness perturbation
Photonic bandgap
Transmittance spectra
