15 September 2004 Three-dimensional silica-gold core-shell photonic crystal: linear reflection and ultrafast nonlinear optical properties
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Abstract
In this paper we analyze linear and ultrafast non-linear properties of a three-dimensional photonic crystal composed of close-packed SiO2/Au/SiO2 core-shell colloidal particles. Strong coupling between incident light and surface plasmon of spherical gold microcavities appears as sharp features in observed reflectivity spectra in the visible. In a single layer of gold-shell particles, a highly directional diffraction pattern was observed with hexagonal symmetry. The non-linear dynamics of the reflectivity has been studied by femtosecond white-light pump-probe experiments. Abrupt changes limited by the instrumental time resolution, were observed in time-resolved reflection spectra while the signal recovers in about 10 ps. Ultrafast changes in reflectivity reach values as high as 20%. The results are compared with theory.
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Dmitry A. Mazurenko, Alexander Moroz, Cristina M. Graf, Alfons van Blaaderen, Jaap I. Dijkhuis, "Three-dimensional silica-gold core-shell photonic crystal: linear reflection and ultrafast nonlinear optical properties", Proc. SPIE 5450, Photonic Crystal Materials and Nanostructures, (15 September 2004); doi: 10.1117/12.545864; https://doi.org/10.1117/12.545864
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