Enhancement of light absorption using Nanoparticles Embedded Double layer Anti-Reflection Coating
Keywords:anti-reflection coating, T-matrix, effective medium theory, nanoparticles, SERS
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 nano-particles(NPs) to fine tune the effective index of two dielectric layers towards anti-reflection coating applications. Here, the upper layer is MgF2 (magnesium fluoride) and the lower layer is PMMA (Polymethylmethacrylate). The effect of embedding the nano-particles 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 nano-particles there is a red shift in the transmission dip. On varying the nano-particle size the peak absorption can be shifted to the desired wavelength. Considering 50 nm silver nano-particle 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
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