一种基于光子晶体结构的军用车辆红外隐身涂层的设计

根据军用车辆的体表温度,针对红外大气窗口,选用常见的Si和LiF为介质,并在考虑各自色散关系的基础上,设计了一具有光子晶体结构的复合涂层。利用传输矩阵法计算表明,当Si和LiF均取4层,且每层的几何厚度分别取0.800 m和1.900 m时,在8~14 m之间存在一个严格的带隙,此带隙有以下特征:介质层数大于4时,带隙不再发生实质性的变化。增加两介质的几何厚度,带隙红移,宽度变宽,反之亦然。入射角增加,8~14 m之间的带隙总是存在。以上结论可为该复合涂层的进一步研究提供有益的参考。

Design of infrared stealth coating of military vehicle based on photonic crystal

According to the surface temperature of military vehicles and for the infrared atmospheric window, a compound coating having photonic crystal structure was designed using common Si and LiF as the medium and in consideration of the respective dispersion relations. The calculation using the transfer matrix method showed when the two medium are of 4 layers respectively, with geometric thickness of each layer is 0.800 m and 1.900 m, there would be a strict band gap within 8-14 m, and the band gap had the following characteristics: With five or more medium layers, the band gap no longer changed substantially. When the geometric thickness of two medium increased, the band gap would have red shifts, width is wider and vice versa. The band gap between 8-14 m always exist regardless the changes of the incident angle. These conclusion may provide a useful reference for the experiment study of the coating.