Comparison between discrete dipole approximation and other modelling methods for the plasmonic response of gold nanospheres
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- Loke, V.L.Y., Huda, G.M., Donev, E.U. et al. Appl. Phys. B (2014) 115: 237. doi:10.1007/s00340-013-5594-z
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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.