基于光学Tamm态的广角度完美吸收  

Wide-Angle Perfect Absorption Based on the Optical Tamm States

作　　者：陈宪锋[1] 李淑娟[1] 张艳[1] 金子涵 

机构地区：[1]常州大学数理学院,江苏常州213164

出　　处：《常州大学学报（自然科学版）》2014年第2期83-86,共4页Journal of Changzhou University：Natural Science Edition

摘　　要：基于光学Tamm态设计了一个金属-DBR结构,利用传输矩阵理论,通过光子带隙中的反射谱dip位置来确定光学Tamm态(OTS)的本征波长,并进而研究了OTS的有关特征。在金属-DBR结构的界面处,存在着TE、TM模式的两种光学Tamm态,且可以用一般电磁波入射来激发。金属层厚度对OTS的本征波长及其相应的吸收率影响较大。随着金属层厚度的增加,OTS的本征波长将出现蓝移现象,即波长变短,最后逐渐趋近于一个稳定值,而结构对OTS的吸收率则出现一个峰值效应。当金属Ag层的厚度为39nm时,结构对OTS的吸收率接近于1,即完美吸收。进一步的研究表明,这一结构参数的金属-DBR结构,可以实现广角度的完美吸收。Based on the optical Tamm states,a metal-DBR structure is presented.The existence of the eigen-wavelength of the optical Tamm states is demonstrated by the dip of the reflectivity map in the photonic band gap.The properties of the optical Tamm states are investigated by applying the transfer matrix method.OTSs can be directly excited in both TE and TM polarizations,even at normal incidence,especially in the metal-Distributed Bragg Reflectors（DBR）interface.The Ag thickness have a big effect on on the absorption and wavelength.The eigen-wavelength of the OTSs has a blue-shift（the wavelength decreases）as the Ag thickness increase,and then gradually tend to a stable value while the peaking effects were found in the absorption.The perfect absorber will appear when the Ag thickness is 39nm and the absorbance reach the maximum value 1.Further study shows that the wide-angle perfect absorption appears under the parameters of the metal-DBR structure.

关 键 词：光学Tamm态 传输矩阵法 完美吸收 

分 类 号：O437[机械工程—光学工程]