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In the present paper, we have investigated the solitonic characteristics of a pulse passing through an interface separating two nonlinear media. The first media is a thin film of gallium nanoparticles which show switching properties under optical excitation and second is a monomode optical fiber. Various properties of three different phases of gallium nanoparticles have been analyzed by using the equivalent particle theory and Maxwell-Garnett effective medium theory.

In the present paper, we have investigated the solitonic characteristics of a pulse passing through an interface separating two nonlinear media. The first media is a thin film of gallium nanoparticles which show switching properties under optical excitation and second is a monomode optical fiber. Soliton propagation in three different phases of gallium nanoparticles have been analyzed by using the method of phase-plane analysis. Also, the critical power required for soliton propagation has been calculated.

A Model for achieving a large optical nonlinearity via ultrashort laser pulse induced phase transformation in Ga-Si nanostructures has been developed.The soliton solutions of nonlinear Schrodinger equation for Ga-Si switch on the tip of an optical fiber are obtained using phase plane analysis. Solutions show that light induced phase transformations give rise to the change in nonlinear response of the film which has been studied theoretically.

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