Nano-particles as inclusion in multilayer Thinfilm Anti-reflection Coating to provide Ultraviolet Blocking

Abstract

This Thesis is dedicated to proposes the use of Silver metal nanoparticles embedded in TiO2 based porous composite material which tend to mitigate the transmission of near-ultraviolet (UV) radiation across a thin film anti-reflection coating (ARC) arrangement. The proposed structure is based on a double layer porous TiO2 thin film of specific thickness having a definite volume fraction to attain antireflection property. With Silver nanoparticles as inclusion in the upper layer of the double layer thinfilm structure the ultraviolet blocking is optimized in the range of 320nm-400nm. Considering the porous film, the dielectric property of the thinfilm coating can be precisely regulated to achieve effective antireflection properties. The calculations indicated that 10 nm Silver nanoparticles with volume-fraction of 0.01 and film thickness,(51nm top layer & 102nm lower layer) gives the best results for blocking of near UV radiation. Decreasing the aspect ratio of the prolate nano-spheriod gives better UV blocking intensity.