Abstract

We have proposed a kind of one-dimensional photonic heterostructure for efficient all-optical dual-channel switches, logic gates, half-adder, and half-subtracter, based on the combined usage of two high-quality and one low-quality resonant modes with their electric fields strongly enhanced in the same defect regions. By exciting the low-quality modes with a low-intensity pump beam, one can efficiently shift the spectral positions of two high-quality modes and thus simultaneously control the propagation of signals at two frequency channels. For an AlGaAsSiO2 heterostructure with two GaAs defect regions, the peak pump intensity can be lower than 6.2mWmm2. When the frequency of the signal light is properly set relative to the two high-quality modes, its propagation can be logically controlled by pump beams with low intensity on the order of 10mWmm2. Moreover, the frequency interval between the two high-quality modes and that between the high- and low-quality modes are adjustable in a wide range.

© 2008 Optical Society of America

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