光学学报, 2015, 35 (1): 0116003, 网络出版: 2014-12-15
金属-光子晶体-金属结构中的双波TE偏振完美吸收 下载: 567次
TE Polarization Perfect Absorption with Dual-band in Metal-Photonic Crystal-Metal Structure
物理光学 光学Tamm 态 传输矩阵 双波 横向电场偏振 完美吸收 physical optics optical Tamm states transfer matrix method dual-band transverse electric polarization perfect absorption
摘要
设计了一个一维金属(M1)-光子晶体(PC)-金属(M2)结构,利用传输矩阵理论,通过M1-PC-M2结构反射谱中的dip(凹处)来确定光学Tamm态(OTS),数值计算表明在金属与光子晶体界面处存在两个OTSs,当45 nm≤dM1≤52 nm时,M1-PC-M2结构可同时实现对两个OTSs的横向电场(TE)偏振完美吸收,吸收峰的峰值波长约为743.1 nm 与745.7 nm,吸收率均在95%以上。当入射角从0°增大到60°,该结构对两个OTSs的吸收率均在95%以上,同时实现对两个OTSs的TE偏振完美吸收,并且两个吸收峰的峰值波长发生蓝移。当光子晶体周期数在7到15之间变化时,均可实现双波TE偏振完美吸收。
Abstract
Design of a one-dimensional metal-photonic crystal-metal(M1-PC-M2) structure is presented. The existence of optical Tamm state (OTS), corresponding to dips in the reflection spectra of the structure, which is determined by the transfer- matrix method. Numerical results show that two OTSs appear at the interface between the metal film and photonic crystal, transverse electric (TE) polarization perfect absorption with dualband as high as over 95% is achieved when 45 nm≤dM1≤52 nm, and two absorption wavelengths are near 743.1 nm and 745.7 nm. As the incident angles increase from 0° to 60° , the absorption of two OTSs can still stay above 95%, the M1-PC- M2 structure achieving TE polarization perfect absorption of two OTSs simultaneously, and the blue- shifts of both absorption peaks occurs. When the number of period of photonic crystal is between seven and fifteen, TE polarization perfect absorption with dual-band is always accomplished.
陆苏青, 巢小刚, 陈宪锋, 唐斌. 金属-光子晶体-金属结构中的双波TE偏振完美吸收[J]. 光学学报, 2015, 35(1): 0116003. Lu Suqing, Chao Xiaogang, Chen Xianfeng, Tang bin. TE Polarization Perfect Absorption with Dual-band in Metal-Photonic Crystal-Metal Structure[J]. Acta Optica Sinica, 2015, 35(1): 0116003.