Slow to superluminal light waves in thin 3D photonic crystals

Phase measurements on self-assembled three-dimensional photonic crystals show that the group velocity of light can flip from small positive (slow) to negative (superluminal) values in samples of a few mum size. This phenomenon takes place in a narrow spectral range around the second-order stop band...

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Bibliographic Details
Published in:Optics express 2007-11, Vol.15 (23), p.15342-15350
Main Authors: Galisteo-López, J F, Galli, M, Balestreri, A, Patrini, M, Andreani, L C, López, C
Format: Article
Language:English
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Summary:Phase measurements on self-assembled three-dimensional photonic crystals show that the group velocity of light can flip from small positive (slow) to negative (superluminal) values in samples of a few mum size. This phenomenon takes place in a narrow spectral range around the second-order stop band and follows from coupling to weakly dispersive photonic bands associated with multiple Bragg diffraction. The observations are well accounted for by theoretical calculations of the phase delay and of photonic states in the finite-sized systems.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.15.015342