Surface scattering contribution to the plasmon width in embedded Ag nanospheres
Artikel i vetenskaplig tidskrift, 2014

Nanometer-sized metal particles exhibit broadening of the localized surface plasmon resonance (LSPR) in comparison to its value predicted by the classical Mie theory. Using our model for the LSPR dependence on non-local surface screening and size quantization, we quantitatively relate the observed plasmon width to the nanoparticle radius R and the permittivity of the surrounding medium epsilon(m). For Ag nanospheres larger than 8 nm only the non-local dynamical effects occurring at the surface are important and, up to a diameter of 25 nm, dominate over the bulk scattering mechanism. Qualitatively, the LSPR width is inversely proportional to the particle size and has a nonmonotonic dependence on the permittivity of the host medium, exhibiting for Ag a maximum at epsilon(m) approximate to 2.5. Our calculated LSPR width is compared with recent experimental data.


R. C. Monreal

Universidad Autonoma de Madrid

Peter Apell

Chalmers, Teknisk fysik

Tomasz Antosiewicz

Chalmers, Teknisk fysik, Bionanofotonik

Optics Express

1094-4087 (ISSN)

Vol. 22 24994-25004


Atom- och molekylfysik och optik

Annan elektroteknik och elektronik