A generalized non-local optical response theory for plasmonic nanostructures

N. A. Mortensen (), S. Raza, M. Wubs, T. Søndergaard and S. I. Bozhevolnyi
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N. A. Mortensen: Technical University of Denmark
S. Raza: Technical University of Denmark
M. Wubs: Technical University of Denmark
T. Søndergaard: Aalborg University
S. I. Bozhevolnyi: University of Southern Denmark

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Metallic nanostructures exhibit a multitude of optical resonances associated with localized surface plasmon excitations. Recent observations of plasmonic phenomena at the sub-nanometre to atomic scale have stimulated the development of various sophisticated theoretical approaches for their description. Here instead we present a comparatively simple semiclassical generalized non-local optical response theory that unifies quantum pressure convection effects and induced charge diffusion kinetics, with a concomitant complex-valued generalized non-local optical response parameter. Our theory explains surprisingly well both the frequency shifts and size-dependent damping in individual metallic nanoparticles as well as the observed broadening of the crossover regime from bonding-dipole plasmons to charge-transfer plasmons in metal nanoparticle dimers, thus unravelling a classical broadening mechanism that even dominates the widely anticipated short circuiting by quantum tunnelling. We anticipate that our theory can be successfully applied in plasmonics to a wide class of conducting media, including doped semiconductors and low-dimensional materials such as graphene.

Date: 2014
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DOI: 10.1038/ncomms4809

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