Preparation, characterization and simulation of Al@SiO2 nanoparticle composite films with infrared–visible stealth

With the rapid development of modern multi-band detection technology, stealth materials face unprecedented severe challenges. At present, it is still a difficult problem to achieve infrared–visible compatible stealth. By magnetron co-sputtering method, we prepare [email protected]2 nanoparticle composite films with different thicknesses. With the film thickness increasing, the reflection increases in the broad infrared range (3 ~ 14 μm) and decreases in the whole visible band (300 nm ~ 800 nm) significantly. When the film thickness is optimized to 172 nm, the reflectivity is up to 96% in the broad infrared range and down to 35% in the whole visible range. Excellent infrared and visible spectra control, cheap source materials and simple fabrication method endow [email protected]2 nanoparticle composite films important applications in infrared–visible compatible stealth and photothermal management.