Radiative frequency shifts in nanoplasmonic dimers
Physical Review B
American Physical Society
© 2017 American Physical Society
We study the effect of the electromagnetic environment on the resonance frequency of plasmonic excitations in dimers of interacting metallic nanoparticles. The coupling between plasmons and vacuum electromagnetic fluctuations induces a shift in the resonance frequencies, analogous to the Lamb shift in atomic physics, which is usually not measurable in an isolated nanoparticle. In contrast, we show that this shift leads to sizeable corrections to the level splitting induced by dipolar interactions in nanoparticle dimers. The ratio between the level splitting for the longitudinal and transverse hybridized modes takes a universal form dependent only on the interparticle distance and thus is highly insensitive to the precise fabrication details of the two nanoparticles. We discuss the possibility to successfully perform the proposed measurement using state-of-the-art nanoplasmonic architectures.
This work was partially funded by the Agence Nationale de la Recherche (Project ANR-14-CE26-0005 Q-MetaMat), the Centre National de la Recherche Scientifique through the Projet International de Cooperation Scientifique program (Contract Nr. 6384 APAG), the Leverhulme Trust (Research Project Grant RPG-2015-101), and the Royal Society (International Exchange Grant Nr. IE140367, Newton Mobility Grants 2016/R1 UK-Brazil, and Theo Murphy Award TM160190).
This is the author accepted manuscript. The final version is available from APS via the DOI in this record.
Vol. 96, article 155421