Size dependence of plasmon absorption of Ni nanoparticles embedded in BaTiO3/SrTiO3 superlattices

The self-organized nickel nanoparticles deposited with different laser energy densities were embedded in barium titanate/strontium titanate superlattices using laser molecular beam epitaxy. The increasing sizes and irregular shapes of nickel nanoparticles were observed as the increase of laser energy density. By the absorption spectra investigation, the absorption peak presented red-shift and broadening phenomenon with the increase of the sizes. The results were explained by the calculation of real and imaginary permittivity of bulk nickel.