Abstract
For an oblique s-polarized incident wave, we study the optical response behaviour of dielectric multifilm systems containing an arbitrary number of film components with dielectric coefficients that have a self-focusing Kerr nonlinearity. The optical field propagation is rigorously described in the framework of Maxwell's theory, permitting the determination of such properties as transmittance/reflectivity and the dispersion relations for guided wave solutions by means of a straightforward matrix calculus reminiscent of linear thin film optics. We discuss the angular transmittance characteristics of various geometries and monitor the evolution of selected transmission resonances with the incident power flux as the tuning parameter. Under conditions where transmission resonances compete with distinct reflection mechanisms, such as total internal reflection or Bragg reflection, the angular transmittance peaks show steep slopes, which tend strongly towards backbending, thus connecting the excitation of these transmission resonances with all-optical switching effects. Transmission resonances without linear limit, mediated by the excitation of specific nonlinear guided wave fields, have been identified too.
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