Analysis of the main optical mechanisms responsible for fragmentation of gold nanoparticles by femtosecond laser radiation

Studies of fragmentation process of gold nanoparticles (Nps) in deionized water after generation by femtosecond laser ablation were performed. To analyze the fragmentation process, direct IR ultrafast pulses or super-continuum (SC) radiation focused in the colloidal solution were used in separate st...

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Bibliographic Details
Published in:Journal of applied physics 2010-06, Vol.107 (11)
Main Authors: Videla, F. A., Torchia, G. A., Schinca, D. C., Scaffardi, L. B., Moreno, P., Méndez, C., Giovanetti, L. J., Ramallo Lopez, J. M., Roso, L.
Format: Article
Language:English
Subjects:
ABLATION
ABSORPTION
COHERENT SCATTERING
COLLOIDS
CORUNDUM
CRYSTALS
DIFFRACTION
DISPERSIONS
ELECTROMAGNETIC RADIATION
ELECTRON MICROSCOPY
ELEMENTS
GOLD
HYDROGEN COMPOUNDS
LASER RADIATION
MATERIALS SCIENCE
METALS
MICROSCOPY
MINERALS
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
OXIDE MINERALS
OXYGEN COMPOUNDS
PARTICLES
RADIATIONS
SAPPHIRE
SCATTERING
SMALL ANGLE SCATTERING
SORPTION
SPECTRAL RESPONSE
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY
WATER
X-RAY DIFFRACTION
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Summary:Studies of fragmentation process of gold nanoparticles (Nps) in deionized water after generation by femtosecond laser ablation were performed. To analyze the fragmentation process, direct IR ultrafast pulses or super-continuum (SC) radiation focused in the colloidal solution were used in separate steps. IR pulses and SC generated externally in a sapphire crystal or directly inside the water were applied under low fluence regime. In the latter cases, to evaluate the effect on fragmentation of the different spectral bands present in the SC, we have determined different efficiency regions characterized by means of the product between the spectral response and the optical extinction spectrum corresponding to the initial Nps solution. From the analysis of this product function, we can conclude that the main fragmentation mechanism is due to linear absorption in the visible region. Likewise, the SC generated in water resulted more efficient than the SC obtained externally by a sapphire crystal. This fact may be attributed to the blue broadening of the water SC spectrum (as compared with the sapphire SC) due to the large intensity used for its generation. Transmission electron microscopy and small angle x-ray scattering measurements support the results found from optical extinction spectroscopy.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3428432