基于光子晶体结构的双红外隐身涂层设计  

Design of double infrared stealth coating based on photonic crystal

作　　者：李文胜[1] 张琴[1] 黄海铭[1] 付艳华[1] 

机构地区：[1]湖北汽车工业学院,湖北十堰442002

出　　处：《红外与激光工程》2012年第10期2578-2582,共5页Infrared and Laser Engineering

基　　金：湖北省教育厅科学技术研究项目(Q20122307)

摘　　要：为减少目标暴露，针对红外探测器3000～5000nm和8000～14000nm的工作波长，选用常见的LiF和si为介质，并在考虑各自色散关系的基础上，设计了具有光子晶体结构的隐身射涂层。结果表明：当两介质各取4层、其几何厚度分别为1400rim和870rim时，涂层分别在8000～14000nm和3000～5000nm的范围内有一个主、次带隙，主带隙的透射率为零，而次带隙中有两个尖锐的透射峰。当两介质的几何厚度增加，带隙红移，宽度增加，次带隙的平均透射率也增加，反之亦然。当涂层层数为6时，该涂层已在上述波长范围内形成了相应的带隙，介质层数再增加，带隙没有实质性的变化。对于角度入射涂层具有较好的角度宽容度。该结构的涂层可用于重要目标的红外隐身。This new stealth coating based on photonic crystal structure was designed to reduce infrared exposure of the target, especially for the thermal infrared detectors＇ operating wavelength of 30 000-5 000 nm and 8000-14 000rim. The coating used common material LiF and Si as the medium and according to the dispersion relation. Results indicate that there would be a main band gap and a sub-band gap within the wavelength range of 8 000-14 000 nm and 3 000-5000 nm when the two medium were of 4 layers and the geometric thickness of 1 400 nm and 870 nm respectively. The transmittance of main band gap was zero, while two sharp transmission peaks appeared in the sub-band gap. The band gap red shift, the width and the average transmittance of sub-band gap increase with increasing the medium thickness, vice versa. The coating can also from the abovementioned band gap within the same wavelength range when the medium were of 6 layers. With more medium layers, there would be no substantial change with the band gap. The coating has excellent angle tolerance for angled incidence, which can be used for infrared stealth on important targets.

关 键 词：红外辐射 涂层 光子晶体 隐身 

分 类 号：N97[自然科学总论]