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In this communication, we present a numerical study of the linear and nonlinear optical transmission through a thin layer near the critical angle of incidence. The optical linear transmission presents very important variations according to the optical Kerr effect. The study of the linear optical transmission allows defining the operation point of the thin layer in nonlinear regime. This study effects are important for optical applications such the all optical switching and the sensitive determination of the nonlinear refractive index (n2) of materials.

Analysis of the optical transmission through a nonlinear thin layer near the critical angle of incidence