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30 August 2006 Surface plasmon-like behavior of two-photon induced photoluminescence of gold nanorods
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Local surface plasmons resonances are widely accepted to be the basis for improving the efficiency of absorption and emission processes through a local electromagnetic field enhancement. Nonlinear processes in gold surfaces such as second harmonic generation or two-photon induced photoluminescence are particularly sensitive to this local effect due to their quadratic dependence on the intensity. Isolated regions of enhanced photoluminescence yield on rough gold surfaces were identified emphasizing the physical similarities with surface enhanced Raman scattering (SERS) substrates. In this vein, we investigated luminescence from individual gold nanorods and found that their emission characteristics closely resemble surface plasmon behavior. In particular, we observed spectral similarities between the scattering spectra of individual nanorods and their photoluminescence emission. We also measured a blue-shift of the photoluminescence peak wavelength with decreasing aspect ratio of the nanorods as well as an optically tuneable shape-dependent spectrum of the photoluminescence. The emission yield of single nanorods strongly depends on the orientation of the incident polarization consistent with the properties of surface plasmons.
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A. Bouhelier, R. Bachelot, G. Lerondel, S. Kostcheev, P. Royer, and G. P. Wiederrecht "Surface plasmon-like behavior of two-photon induced photoluminescence of gold nanorods", Proc. SPIE 6323, Plasmonics: Metallic Nanostructures and their Optical Properties IV, 63230H (30 August 2006);

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