Enhancement of light absorption using Nanoparticles Embedded Double layer Anti-Reflection Coating

The formation of nanoparticles embedded composite materials is a means for engineering the electrical and optical properties of thin films. This paper proposes the use of gold and silver nanoparticles (NPs) to fine tune the effective index of two dielectric layers towards anti-reflection coating applications. Here, the upper layer is magnesium fluoride (MgF2) and the lower layer is Polymethyl methacrylate (PMMA). The effect of embedding the nanoparticles in the PMMA layer on the transmission spectrum is studied while tuning the concentration (volume fraction) and size of particles. With the increase in the size of the nanoparticles there is a red shift in the transmission dip. On varying the nanoparticle size the peak absorption can be shifted to the desired near ultra-violet radiation region, hence prevent transmission through the thin film arrangement. Considering 30 nm silver nanoparticle with the volume fraction ranging from 0.001 to 0.05, maximum transmission of light is observed under lower wavelength range of visible spectrum across the novel structure