Effects of size polydispersity on the extinction spectra of colloidal nanoparticle aggregates

Описание

Тип публикации: статья из журнала

Год издания: 2012

Идентификатор DOI: 10.1103/PhysRevB.85.045421

Аннотация: We investigate the effect of particle polydispersity on the optical extinction spectra of colloidal aggregates of spherical metallic (silver) nanoparticles, taking into account the realistic interparticle gaps caused by layers of stabilizing polymer adsorbed on the metal surface (adlayers). The spectra of computer-generated aggregaПоказать полностьюtes are computed using two different methods. The coupled-multipole method is used in the quasistatic approximation and the coupled-dipole method beyond the quasistatics. The latter approach is applicable if the interparticle gaps are sufficiently wide relative to the particle radii. Simulations are performed for two different particle size distribution functions (bimodal and Gaussian), varying the number of particles per aggregate, and different distribution functions of the interparticle gap width. The strong influence of the latter factor on the spectra is demonstrated and investigated in detail.

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Издание

Журнал: PHYSICAL REVIEW B

Выпуск журнала: Vol. 85, Is. 4

ISSN журнала: 10980121

Место издания: COLLEGE PK

Издатель: AMER PHYSICAL SOC

Авторы

  • Ershov A.E. (Siberian Federal University)
  • Isaev I.L. (L. V. Kirenskiy Institute of Physics,Russian Academy of Sciences)
  • Semina P.N. (L. V. Kirenskiy Institute of Physics,Russian Academy of Sciences)
  • Karpov S.V. (Siberian Federal University)
  • Markel V.A. (Department of Radiology,Graduate Group in Applied Mathematics and Computational Science,University of Pennsylvania)

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