Effect of composite structure on titanium alloy for infrared antireflection performance

Abstract

Infrared reconnaissance and detection systems pose a major threat to aerial targets, and improving the infrared antireflection of aircraft surfaces has become a key problem to be solved urgently. Most researchers have fabricated a single structure and achieved good infrared antireflection performance. However, a single structure's improvement of infrared antireflection performance is limited. Therefore, this study prepared a novel composite antireflective structure with slotted holes using FDTD simulation combined with femtosecond laser design to further improve the infrared anti-reflective performance. The results show that the antireflection performance of the simulated groove-hole composite structure is better than that of the individual groove and hole structures, and the nanoparticle structures can further improve the antireflection performance in the infrared region. The composite structure fabricated by femtosecond laser had an average infrared reflectance of about 7.8% in the range of 8–14 µm and hydrophobicity. After sandpaper abrasion and tape peeling tests, it still has good anti-reflective properties, indicating the structure has excellent resistance to impact and abrasion. The surface roughness of the micro-nano-composite structures made by a femtosecond laser is much higher, and they have not only the properties of geometrically trapped light, but also the resonance absorption and scattering of unexcited elements such as metal nanoparticles, which gives them excellent infrared antireflection properties.