Redshift of surface plasmon modes of small gold rods due to their atomic roughness and end-cap geometry

Carlos Pecharromán, Jorge Pérez-Juste, Gustavo Mata-Osoro, Luis M. Liz-Marzán, and Paul Mulvaney
Phys. Rev. B 77, 035418 – Published 17 January 2008

Abstract

We use the surface integral technique for calculation of the extinction spectra of small metal particles of different shapes. We consider in detail different nonellipsoidal geometries in the electrostatic limit, including cylinders and a variety of capped cylinders. It is shown that different capping geometries have pronounced effects on the energy and intensity of the longitudinal surface plasmon mode. In addition, we propose that atomic scale surface roughness may also be an important determinant of the surface plasmon peak energy. A surface roughness of 0.10, equivalent to around two atomic layers, can generate redshifts in surface plasmon modes similar in magnitude to the redshifts induced by changes in the end-cap geometry.

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  • Received 27 June 2007

DOI:https://doi.org/10.1103/PhysRevB.77.035418

©2008 American Physical Society

Authors & Affiliations

Carlos Pecharromán1, Jorge Pérez-Juste2, Gustavo Mata-Osoro1, Luis M. Liz-Marzán2, and Paul Mulvaney3

  • 1Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, Madrid 28049, Spain
  • 2Departamento de Química Física and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain
  • 3Chemistry School, University of Melbourne, Parkville, Victoria 3010, Australia

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Issue

Vol. 77, Iss. 3 — 15 January 2008

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