Nonlinear disordered media for broad-band optical limiting

摘要

We analyze broad-band limiting behavior in nonlinear structuresnthat are, on average, periodic. Introduction of a controlled degree ofnrandomness in layer thicknesses results in widening of the stopband.nLight at all of the frequencies in this broadened effective stopband ofnthe structure with randomly perturbed layer thicknesses exhibits truenoptical limiting-clamping of the transmitted intensity below a fixednlevel independent of incident intensity. We explore the impact of thendegree of randomization and the strength of the nonlinear mechanism onnthe smoothness and regularity of the limiting spectrum and on thenlocalization of the light within these cyclostationary media. Opticalnlimiting in integrable devices is of interest in optical logic, signalnprocessing, and personnel and sensor protection