Research on Multi-Band Compatible Stealth Films in Green Circumstance

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, 1.06 μm laser, middle and far infrared, as well as 10.6 μm 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 10.6 μm laser. The multi-layered film structure was designed to achieve compatible stealth of visible and near-infrared and 1.06 μm laser. Simulations show that the average reflectance is 0.917 and 0.927 for the middle and far infrared bands, and 0.066 and 0.117 for the 1.06 μm and 10.6 μm 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°.