Bridging quantum and classical plasmonics with a quantum-corrected model

Ruben Esteban, Andrei G. Borisov, Peter Nordlander and Javier Aizpurua ()
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Ruben Esteban: Material Physics Center CSIC-UPV/EHU and Donostia International Physics Center DIPC, Paseo Manuel de Lardizabal 5, Donostia-San Sebastián 20018, Spain.
Andrei G. Borisov: Institut des Sciences Moléculaires d′Orsay - UMR 8214, CNRS-Université Paris Sud, Bâtiment 351, Orsay Cedex 91405, France.
Peter Nordlander: MS61, Laboratory for Nanophotonics, Rice University
Javier Aizpurua: Material Physics Center CSIC-UPV/EHU and Donostia International Physics Center DIPC, Paseo Manuel de Lardizabal 5, Donostia-San Sebastián 20018, Spain.

Nature Communications, 2012, vol. 3, issue 1, 1-9

Abstract: Abstract Electromagnetic coupling between plasmonic resonances in metallic nanoparticles allows for engineering of the optical response and generation of strong localized near-fields. Classical electrodynamics fails to describe this coupling across sub-nanometer gaps, where quantum effects become important owing to non-local screening and the spill-out of electrons. However, full quantum simulations are not presently feasible for realistically sized systems. Here we present a novel approach, the quantum-corrected model (QCM), that incorporates quantum-mechanical effects within a classical electrodynamic framework. The QCM approach models the junction between adjacent nanoparticles by means of a local dielectric response that includes electron tunnelling and tunnelling resistivity at the gap and can be integrated within a classical electrodynamical description of large and complex structures. The QCM predicts optical properties in excellent agreement with fully quantum mechanical calculations for small interacting systems, opening a new venue for addressing quantum effects in realistic plasmonic systems.

Date: 2012
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DOI: 10.1038/ncomms1806

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