Data di Pubblicazione:
2007
Abstract:
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 µm 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.
photonic crystals show that the group velocity of light can flip from small positive (slow) to negative (superluminal) values in samples of a few µm 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.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
Photonic Crystals; slow and superluminal propagation; phase-sensitive interferometry
Elenco autori:
J. F., GALISTEO LÓPEZ; Galli, Matteo; Balestreri, Alessandra; Patrini, Maddalena; Andreani, Lucio; C., López
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