基于复合凹槽的光栅型红外线吸收器  

Grating-type infrared absorber based on composite grooves

作　　者：陈曦 薛文瑞[1] 赵晨 李昌勇[2] 

机构地区：[1]山西大学物理电子工程学院,山西太原030006 [2]山西大学量子光学与光量子器件国家重点实验室激光光谱研究所,山西太原030006

出　　处：《红外与毫米波学报》2018年第1期87-91,97,共6页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金(61378039;61575115);国家基础科学人才培养基金(J1103210)~~

摘　　要：设计了一种基于LiF和NaF材料的复合凹槽的光栅型红外吸收器.采用频域有限差分法(FDFD)分析了这种吸收器的吸收机理,以及结构参数、入射波的波长和入射角度对其吸收特性的影响.结果表明,对于入射的不同波长的红外线,这种吸收器会形成不同的光学谐振腔,能够在较宽的波长范围内对红外线形成强烈的吸收.在采用优化参数的条件下,在18~70μm的波长范围和0~80°的入射角范围内,这种吸收器具有良好的吸收效果.文章的研究工作给光栅型红外线吸收器的设计、制作和应用提供了理论基础.A grating-type infrared absorber based on LiF and NaF material composite grooves is designed. The finite-difference frequency-domain （FDFD） method is used to analyze the absorption mechanism. In addition, the influence of the structure parameters of the absorber, the wavelength of the incident wave and the incident angle on the absorption characteristics are investigated. The results show that this absorber will form different optical resonators for incident light of different wavelengths in infrared region, which can strongly absorb infrared light over a wide wavelength range. The absorber has a good absorption performance in the range of 18 - 70 μm wavelength range and 0 - 80° of incident by using the optimized parameters. The research work of this paper provides a theoretical basis for the design, fabrication and application of the grating-type infrared absorber.

关 键 词：吸收器 光栅 频域有限差分法 红外 表面等离子 

分 类 号：O431[机械工程—光学工程]