Antireflection Film High Extinction Coefficient Layers

The patent employs a composite multilayer structure combining dielectric layers (SiO2, TiO2) with metal layers (Al, Au, Ag, Cu). This composite approach leverages the high extinction coefficient of metals to suppress substrate reflectance effects while using dielectric layers for optical interference control, thereby achieving reliable light reflection suppression that conventional single-material films cannot provide

The antireflection film is segmented into multiple functional layers: dielectric layers for optical interference management and metal layers for light absorption. This segmentation allows each layer to perform its specific function optimally, with the metal layers specifically targeting the suppression of substrate reflectance effects that dielectric layers alone cannot handle

The metal layers (Al, Au, Ag, Cu) serve as intermediaries between the dielectric antireflection layers and the high-reflectance substrate. These metal layers absorb the reflected light that would otherwise pass through the dielectric layers and cause interference, thereby mediating the interaction between the substrate and the optical system to eliminate the harmful substrate reflectance effect

The invention converts the potentially harmful substrate reflectance into a beneficial effect by positioning metal layers with high extinction coefficients between the substrate and dielectric layers. The reflected light from the substrate is absorbed by the metal layers, transforming the harmful reflectance into heat energy, while the dielectric layers above manage the optical interference constructively