Radiative frequency shifts in nanoplasmonic dimers

Abstract

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 sizable corrections to the level splitting induced by dipolar interactions in nanoparticle dimers. For the system parameters which we consider in this work, 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.

10 pages, 5 figures, published version

References in corpus (5)

• Ab-initio nanoplasmonics: The impact of atomic structure
• Surface plasmon in metallic nanoparticles: renormalization effects due to electron-hole excitations
• Lifetime of the first and second collective excitations in metallic nanoparticles
• Reading the orbital angular momentum of light using plasmonic nanoantennas
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Cited by in corpus (12)

• Topological phases of polaritons in a cavity waveguide
• Transport of hot carriers in plasmonic nanostructures
• Topological plasmons in dimerized chains of nanoparticles: robustness against long-range quasistatic interactions and retardation effects
• Chiral current circulation and $\mathcal{P}\mathcal{T}$ symmetry in a trimer of oscillators
• Retardation effects on the dispersion and propagation of plasmons in metallic nanoparticle chains
• Asymmetric coupling between two quantum emitters
• Polaritonic Tamm states induced by cavity photons
• Plasmonic modes in cylindrical nanoparticles and dimers
• Plasmons in two-dimensional lattices of near-field coupled nanoparticles
• Quantum theory of plasmon polaritons in chains of metallic nanoparticles: From near- to far-field coupling regime
• Extreme renormalisations of dimer eigenmodes by strong light-matter coupling
• Spontaneous orbital magnetization of mesoscopic dipole dimers