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Nonlinear optical transmission through periodically nanostructured metal films (surface-plasmon
polaritonic crystals) has been studied. The surface polaritonic crystals have been coated with a nonlinear
polymer. The optical transmission of such nanostructures has been shown to depend on the control-light
illumination conditions. The resonant transmission exhibits bistable behavior with the control-light
intensity. The bistability is different at different resonant signal wavelengths and for different wavelengths
of the control light. The effect is explained by the strong sensitivity of the surface-plasmon mode
resonances at the signal wavelength to the surrounding dielectric environment and the electromagnetic
field enhancement due to plasmonic excitations at the controlled light wavelengths.
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