文件名称:2e
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We have used phase-sensitive ultrashort-pulse interferometry to study the modifi cation of optical
pulse propagation near the photonic band edges in colloidal crystals consisting of polystyrene spheres in
water. A strong suppression of the group velocity is found at frequencies near the L gap of the fcc lat-
tice. The group velocity dispersion diverges at the band edges and shows branches of both normal dis-
persion and anomalous dispersion, which can be interpreted as large changes in the effective mass, both
positive and negative. We obtain excellent agreement with the dynamical diffraction theory.相关搜索： photonic
crystal
fcc
dispersion
pulse propagation near the photonic band edges in colloidal crystals consisting of polystyrene spheres in
water. A strong suppression of the group velocity is found at frequencies near the L gap of the fcc lat-
tice. The group velocity dispersion diverges at the band edges and shows branches of both normal dis-
persion and anomalous dispersion, which can be interpreted as large changes in the effective mass, both
positive and negative. We obtain excellent agreement with the dynamical diffraction theory.相关搜索： photonic
crystal
fcc
dispersion
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