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Title: Phase delay and group velocity determination at a planar defect state in three dimensional photonic crystals
Authors: Galisteo-López, J. F.; Galli, M.; Andreani, Lucio C.; Mihi, Agustín; Pozas, R. ; Ocaña, Manuel ; Míguez, Hernán
Keywords: Defect states
Photonic crystals
Optical modulation
Photonic band gap
Issue Date: 8-Mar-2007
Publisher: American Institute of Physics
Citation: Applied Physics Letters 90(10): 101113 (2007)
Abstract: Phase sensitive optical transmission measurements have been performed on three dimensional opal-based photonic crystals containing a planar defect. From numerical derivation of the measured phase, the group velocity has been retrieved. Strong modulations in the group velocity are seen to correlate with a recovery in the transmission inside the forbidden spectral interval, demonstrating the presence of a localized defect state. Accordingly, the phase change measured across the forbidden interval doubles in the lattice containing a planar defect with respect to the defect-free crystal, as expected when introducing a localized state inside the pseudogap. All results have been modeled with a scalar wave approximation in a two band model including extinction.
Description: 3 pages, 3 figures.-- PACS: 42.70.Qs; 78.20.Ci; 71.55.-i
Publisher version (URL): http://dx.doi.org/10.1063/1.2710772
URI: http://hdl.handle.net/10261/21758
DOI: 10.1063/1.2710772
ISSN: 0003-6951
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