Novel application of a perturbed photonic crystal: High-quality filter

The transmission of light waves through a perturbed photonic crystal has been investigated. The perturbed photonic crystal was constructed by randomly repeated stacking of a number of identical unit cells. Although most of the light waves are localized by the randomness, there still exist light waves with special wavelengths which are in extended states. This produces a high-quality resonant tunneling with a very narrow transmission coefficient peak.

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