光学学报, 2018, 38 (1): 0123002, 网络出版: 2018-08-31
基于LiF和NaF的超宽带红外吸收器 下载: 886次
Ultra-Broadband Infrared Absorber Based on LiF and NaF
摘要
设计了一种基于LiF和NaF材料的光栅型超宽带红外吸收器,并采用频域有限差分法对其吸收特性进行了研究。研究结果表明,单独采用LiF(或NaF)和电介质材料构成的光栅型吸收器都具有较宽的吸收带,但其吸收带处于不同的红外波段。同时采用LiF、NaF及电介质材料构成的光栅型吸收器可以把这两个吸收带衔接起来。通过优化参数,在入射波长为15~45 μm、入射角度为0°~80°的范围内,吸收器的吸收率达到80%以上,实现了宽带吸收。结构中复合层的层数对吸收率有最大的影响,电介质层的厚度对吸收率的影响较小。
Abstract
Grating-type ultra-broadband infrared absorber based on LiF and NaF is designed, and its absorption characteristics are researched by using finite-difference frequency-domain method. Research results show that grating-type absorbers consist of LiF(or NaF) and dielectric material, and they all have wider absorption band. The absorption bands are located at different infrared wavebands. The two absorption bands can be connected by using LiF, NaF and dielectric material together in the absorber. In the range of incident wavelength of 15-45 μm and the range of incident angle of 0°-80°, the absorptivity of the absorber is more than 80% with the optimization of parameters, which realizes broadband absorption. The layer number of the composite layer has the biggest effect on the absorptivity, and the minimal effect is the thickness of the dielectric layer.
陈曦, 薛文瑞, 赵晨, 李昌勇. 基于LiF和NaF的超宽带红外吸收器[J]. 光学学报, 2018, 38(1): 0123002. Xi Chen, Wenrui Xue, Chen Zhao, Changyong Li. Ultra-Broadband Infrared Absorber Based on LiF and NaF[J]. Acta Optica Sinica, 2018, 38(1): 0123002.