This book is focused on nonlinear properties of Gallium nanoparticles. The theoretical model of gallium nanoparticle film at the tip of monomode optical fibre has been developed. The interface problem is solved by phase plane analysis, inverse scattering transform method and equivalent particle theory. Effective dielectric constant of gallium nanoparticles on silica substrate has been calculated using into account the Maxwell-Garnett Effective Medium Theory. Minimum power required for Soliton propagation, Stability, shape and size of soliton have also been calculated. Theoretical results have...