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Surface scattering contribution to the plasmon width in embedded Ag nanospheres

R. C. Monreal ; S. Peter Apell (Institutionen för teknisk fysik) ; Tomasz Antosiewicz (Institutionen för teknisk fysik, Bionanofotonik)
Optics Express (1094-4087). Vol. 22 (2014), 21, p. 24994-25004.
[Artikel, refereegranskad vetenskaplig]

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.

Denna post skapades 2014-12-08. Senast ändrad 2017-09-14.
CPL Pubid: 207633


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Institutioner (Chalmers)

Institutionen för teknisk fysik (1900-2015)
Institutionen för teknisk fysik, Bionanofotonik (2007-2015)


Övrig elektroteknik, elektronik och fotonik

Chalmers infrastruktur