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Phase delay and group velocity determination at a planar defect state in three dimensional photonic crystals

AuthorsGalisteo-López, J. F.; Galli, M.; Andreani, Lucio C.; Mihi, Agustín ; Pozas, R. ; Ocaña, Manuel ; Míguez, Hernán
KeywordsDefect states
Photonic crystals
Optical modulation
Photonic band gap
Issue Date8-Mar-2007
PublisherAmerican Institute of Physics
CitationApplied Physics Letters 90(10): 101113 (2007)
AbstractPhase 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.
Description3 pages, 3 figures.-- PACS: 42.70.Qs; 78.20.Ci; 71.55.-i
Publisher version (URL)http://dx.doi.org/10.1063/1.2710772
Appears in Collections:(ICMS) Artículos
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