绿色背景下多波段兼容隐身薄膜研究

Research on Multi-Band Compatible Stealth Films in Green Circumstance

为对抗多波段复合探测,保护高价值目标,设计了一种绿色背景下兼容可见光-近红外、1.06μm激光、中远红外、10.6μm激光等波段隐身的薄膜材料。基于光子晶体的传输矩阵理论,引入缺陷,实现中远红外波段与10.6μm激光的兼容隐身;设计多层膜结构,实现可见光-近红外波段、1.06μm激光的兼容隐身。对光子晶体与多层膜的复合结构进行仿真计算,中远红外波段的平均反射率分别为0.917、0.927,1.06μm与10.6μm激光的反射率分别为0.066、0.117。同时,在可见光-近红外波段,该结构具备与绿色植物光谱相似的光谱特征。较之以往,该结构拓展了隐身波段至常用激光、优化了热辐射波段隐身性能、增加了实际镀制的可行性。研究入射角度对该结构的性能影响,结果表明,在0°-30°范围内其仍具有很好的隐身效果。

To counter multi-band composite detections and protect high-value targets,a thin film material,which achieved compatibly stealth in green circumstance for visible and near-infrared,1.06μm laser,middle and far infrared,as well as 10.6μm laser was designed.Based on the transfer matrix theory of photonic crystals(PCs),defects were introduced to achieve compatible stealth of middle and far infrared as well as 10.6μm laser.The multi-layered film structure was designed to achieve compatible stealth of visible and near-infrared and 1.06μm laser.Simulations show that the average reflectance is 0.917 and 0.927 for the middle and far infrared bands,and0.066 and 0.117 for the 1.06μm and 10.6μm laser wavelengths,respectively.Meanwhile,the structure possesses characteristic spectrum similar to that of green plants in the visible and near-infrared bands.The structure broadens the stealth bands to common laser wavelengths,optimizes the stealth performance in the thermal radiation band,and increases the feasibility of practical deposition than before.In addition,the effect of incidence angle on the performance of the structure was investigated,which showed a good stealth effect in the range of 0°-30°.