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Role of the surface to volume ratio of metal nanoparticles in the optical properties of Cu:Al2O3 nanocomposite films

AuthorsRequejo-Isidro, José; Coso, Raul del; Solís Céspedes, Javier ; Gonzalo de los Reyes, José; Afonso, Carmen N.
Issue Date2005
PublisherAmerican Institute of Physics
CitationApplied Physics Letters 86: 193104 (2005)
AbstractWe report on the role of the surface-to-volume ratio of Cu nanoparticles sNPsd both in the linear and nonlinear optical properties of Cu:Al2O3 nanocomposite films. The results show that when the shape of the NPs deviates sufficiently from that of a sphere, the increase of the fraction of metal atoms present at the surface sNSd with respect to the total amount of atoms sNTd in the NP leads to a substantial reduction of the enhancement of the local field. As a consequence, for NS /NT values above a certain threshold s<0.4–0.5d, the surface–plasma resonance is smeared out and the nonlinear optical response of the nanocomposite film becomes very weak and independent of the dimensions of the NPs or their volume fraction in the matrix. © 2005 American Institute of Physics.
Identifiersdoi: 10.1063/1.1923198g
issn: 0003-6951
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