High Transmittance Infrared Stealth Thin Films Based on TiO2/Ag/TiO2 Structure

To solve the problem of selecting and controlling the optical characteristics of visible and infrared compatible stealth, a new type of visible light high transmission and infrared low radiation compatible stealth material was proposed, based on the synergistic effect of optical effects such as induced transmission and radiation suppression of TiO2/Ag/TiO2 film structure integration. The mechanism of the influence of structural features on visible light transmittance and infrared reflectance was investigated, the optimization design and preparation of high transmittance infrared stealth film structures was implemented, and its compatibility stealth performance was tested and characterized. The results show that when the thickness of each film layer in the optimized TiO2/Ag/TiO2 structure is 30/18/35 nm, the average visible light transmittance and mid-far infrared reflectance of the quartz substrate sample can reach 81.51% and 90.78%, respectively, indicating high levels of visible light perspective and high-temperature infrared radiation suppression ability. The average visible light transmittance and mid-far infrared reflectance of the flexible PET substrate sample can reach 65.68% and 84.46%, respectively. It has good comprehensive capabilities in perspective, shading, and infrared radiation suppression, and has high flexible surface conformal ability. The results can provide important technical support for the design and application of multi-spectral compatible optical stealth materials.