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Tailoring the surface plasmon resonance of embedded silver nanoparticles by combining nano- and femtosecond laser pulses

AutorDoster, J.; Baraldi, G. ; Gonzalo, J. ; Solís Céspedes, Javier ; Hernández Rueda, Javier ; Siegel, Jan
Fecha de publicación2014
EditorAmerican Institute of Physics
CitaciónApplied Physics Letters 104: 153106 (2014)
ResumenWe demonstrate that the broad surface plasmon resonance (SPR) of a single layer of near-coalescence silver nanoparticles (NPs), embedded in a dielectric matrix can be tailored by irradiation with a single nanosecond laser pulse into a distribution featuring a sharp resonance at 435 nm. Scanning electron microscopy studies reveal the underlying mechanism to be a transformation into a distribution of well-separated spherical particles. Additional exposure to multiple femtosecond laser pulses at 400 nm or 800 nm wavelength induces polarization anisotropy of the SPR, with a peak shift that increases with laser wavelength. The spectral changes are measured in-situ, employing reflection and transmission micro-spectroscopy with a lateral resolution of 4 μ m. Spectral maps as a continuous function of local fluence can be readily produced from a single spot. The results open exciting perspectives for dynamically tuning and switching the optical response of NP systems, paving the way for next-generation applications. © 2014 AIP Publishing LLC.
Descripción5 pags.; 4 figs.
Versión del editorhttp://dx.doi.org/10.1063/1.4871507
Identificadoresdoi: 10.1063/1.4871507
issn: 0003-6951
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