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The paper presents two types of broadband antireflection coatings (AR) for silica glass in the range of optical wavelengths from 400 nm to 1000 nm. Dense and porous AR coatings based on silica nanoparticles (NPs) of different structure were produced by sol-gel process. Thick film AR coating consisted of silver NPs in the matrix of poly(methyl methacrylate) (PMMA) was obtained on the substrate by liquid-phase deposition method. Synthesis conditions of the coatings materials of specified structure are revealed. The linear refraction and the linear absorption of these media at the different wavelength depending on the technology of preparation of coatings are analyzed. An increase in optical transmittance of silica glass with the coatings was up to 8-10% in comparison with the uncoated substrate.

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