| 摘要 |
<p>A thin film layer grown on a coated substrate that introduces an anti-reflection property consists of a film with an average refractive index that is lower than that of the underlying coating on the substrate, wherein the film has a non-uniform refractive index through its depth and a part of the film near an air interface has a refractive index that is lower than the average refractive index of the film. The film layer is preferably non-structured silica or silica based. The film preferably has a controlled degree of porosity to achieve a graded refractive index. Also disclosed is an atmospheric pressure chemical vapour deposition based process using a flame as a reaction energy source for depositing an anti-reflective film layer onto a substrate or coated substrate, wherein a reactive gas mixture including a film precursor impinges on the substrate and the size and concentration of particulates within the mixture is controlled to achieve target optical properties of the layer.</p> |
