Abstract

We show by numerical simulation that a small-radius Gaussian beam impinging upon a thin nonlinear film can switch from a total reflection state to a transmission state if the Kerr nonlinearity is positive. The phenomenon is nonresonant and is similar to interface switching. On the other hand, great differences from previous plane-wave models appear. Extension of these results to wider beams seems possible according to qualitative and quantitative arguments. For a negative nonlinearity the thin film acts as a limiter of the transmitted intensity. For wide beams results are similar to plane-wave results.

© 1994 Optical Society of America

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