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We consider propagation of light pulses detuned from the atomic resonance ina dense two-level medium and photonic structures with it. The large density ofthe medium is important to decrease spatial scale of such nonlinear effects aspulse compression, though it does not provide any fundamentally new phenomenaas compared to dilute media. Frequency detuning decreases the effectivity ofsuch nonlinear phenomena as pulse compression and dispersion spreadingcompensation as well. We propose simple logic gates based on interactionbetween two pulses in one-dimensional nonlinear photonic crystal. It turnedout, that frequency detuning is necessary to obtain ultrafast AND gate, whileOR and NOT gates can be realized in the system without detuning.

Effect of frequency detuning on pulse propagation in one-dimensional photonic crystal with a dense resonant medium: application to optical logic