Abstract
We report theoretically on the engineering of photonic crystal impuritybands to realize multiple channelled optical switches. The mechanism isbased on the confinement of the impurity band in a photonicquantum-well structure, leading to N-quantized confined statescoming from N-coupled defects. Due to the strong localization ofelectromagnetic wave at defect regions, the transmission of confinedstates are greatly dependent on the defects and then multiple channelledoptical switches can be realized by slightly changing the defects by acontrol light. The dependence of the threshold of such a switch on thelayer number of photonic barriers is also given.
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