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BROADBAND ANTIREFLECTIVE COATING BY THE METHOD OF MOLECULAR LAYER DEPOSITION

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The potentialities of a new method of optical interference coatings — the method of molecular layer deposition – are considered. The method allows for constructing structures with the layers thickness of several tens of nanometers. In the research, experimental determination of the refractive indices is performed for the two materials used for formation of broadband antireflection coating — silicon dioxide SiO2 and aluminum oxide Al2O3. A technique is presented for analysis of antireflection coatings satisfying one or more of given conditions. Such coatings can be formed from symmetrical or asymmetric cells. The resulting coatings have a low reflectance in the wavelength range 420—820 nm, and the average reflectance values of symmetric and asymmetric multilayer systems in the wavelength range comprise 1,18 and 0,78 %, respectively. It is shown that asymmetric systems usually provide a greater possibility of enlarging the enlightenment zones than symmetric systems. The effect of thickness deviations on antireflection coating properties s analyzed for the given spectral range. It is established that the molecular layer deposition method makes it possible to create low reflective coating for the wide spectral range while reducing the size of the interference system.

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