Article

Applied Physics B

, Volume 115, Issue 2, pp 237-246

First online:

Comparison between discrete dipole approximation and other modelling methods for the plasmonic response of gold nanospheres

  • V. L. Y. LokeAffiliated withMechanische Verfahrenstechnik, University of BremenSchool of Mathematics and Physics, The University of Queensland Email author 
  • , G. M. HudaAffiliated withDepartment of Electrical and Computer Engineering, University of Kentucky
  • , E. U. DonevAffiliated withDepartment of Electrical and Computer Engineering, University of Kentucky
  • , V. SchmidtAffiliated withMechanische Verfahrenstechnik, University of Bremen
  • , J. T. HastingsAffiliated withDepartment of Electrical and Computer Engineering, University of Kentucky
  • , M. Pinar MengüçAffiliated withSchool of Engineering, Özyeğin University
  • , T. WriedtAffiliated withInstitut für Werkstofftechnik, University of Bremen

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Abstract

We investigate the plasmonic response of gold nanospheres calculated using discrete dipole approximation validated against the results from other discretization methods, namely the finite-difference time-domain method and the finite-element methods. Comparisons are also made with calculations from analytical methods such as the Mie solution and the null-field method with discrete sources. We consider the nanoparticle interacting with the incident field both in free space and sitting on a planar substrate. In the latter case, discrete dipole approximation with surface interaction is used; this includes the interaction with the ‘image dipoles’ using Sommerfeld integration.