Decay of dark and bright plasmonic modes in a metallic nanoparticle dimer

Brandstetter-Kunc, Adam; Weick, Guillaume; Weinmann, Dietmar; Jalabert, Rodolfo A.

doi:10.1103/physrevb.91.035431

Cited by 27 publications

(19 citation statements)

References 42 publications

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“…The interaction between the localised surface plasmons in each nanoparticle forming the bipartite lattice may change the picture above. Indeed, recent theoretical results on metallic nanoparticle dimers [72] suggest that while Landau damping is weakly influenced by the dipolar interaction, radiation damping strongly depends of the wavelength of the collective mode. Further work will be needed in order to investigate this important issue.…”

Section: Resultsmentioning

confidence: 99%

Dirac plasmons in bipartite lattices of metallic nanoparticles

Sturges¹,

Woollacott²,

Weick³

et al. 2015

2D Mater.

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We study theoretically "graphene-like" plasmonic metamaterials constituted by two-dimensional arrays of metallic nanoparticles, including perfect honeycomb structures with and without inversion symmetry, as well as generic bipartite lattices. The dipolar interactions between localised surface plasmons in different nanoparticles gives rise to collective plasmons that extend over the whole lattice. We study the band structure of collective plasmons and unveil its tunability with the orientation of the dipole moments associated with the localised surface plasmons. Depending on the dipole orientation, we identify a phase diagram of gapless or gapped phases in the collective plasmon dispersion. We show that the gapless phases in the phase diagram are characterised by collective plasmons behaving as massless chiral Dirac particles, in analogy with electrons in graphene. When the inversion symmetry of the honeycomb structure is broken, collective plasmons are described as gapped chiral Dirac modes with an energy-dependent Berry phase. We further relax the geometric symmetry of the honeycomb structure by analysing generic bipartite hexagonal lattices. In this case we study the evolution of the phase diagram and unveil the emergence of a sequence of topological phase transitions when one hexagonal sublattice is progressively shifted with respect to the other.

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Section: Resultsmentioning

confidence: 99%

Dirac plasmons in bipartite lattices of metallic nanoparticles

Sturges¹,

Woollacott²,

Weick³

et al. 2015

2D Mater.

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“…We account for the decay by using complex energies ω w + iγ w in the energy denominators of Equations (1–3) as is common practice within the microscopic theory of Raman scattering (Long, 2002; Yu and Cardona, 2010). The Hamiltonian in Equation (14) can also be applied for oligomers or arrays of plasmonic nanoparticles (Brandstetter-Kunc et al, 2015, 2016; Lamowski et al, 2018). In this case trueb^w corresponds to the operator of the hybridized plasmon modes w of the coupled nanoparticles and is given by a Bogoliubov transformation of the single nanoparticle operators.…”

Section: Interaction Hamiltoniansmentioning

confidence: 99%

Modeling Surface-Enhanced Spectroscopy With Perturbation Theory

Mueller

Reich

2019

Front. Chem.

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Theoretical modeling of surface-enhanced Raman scattering (SERS) is of central importance for unraveling the interplay of underlying processes and a predictive design of SERS substrates. In this work we model the plasmonic enhancement mechanism of SERS with perturbation theory. We consider the excitation of plasmonic modes as an integral part of the Raman process and model SERS as higher-order Raman scattering. Additional resonances appear in the Raman cross section which correspond to the excitation of plasmons at the wavelengths of the incident and the Raman-scattered light. The analytic expression for the Raman cross section can be used to explain the outcome of resonance Raman measurements on SERS analytes as we demonstrate by comparison to experimental data. We also implement the theory to calculate the optical absorption cross section of plasmonic nanoparticles. From a comparison to experimental cross sections, we show that the coupling matrix elements need to be renormalized by a factor that accounts for the depolarization by the bound electrons and interband transitions in order to obtain the correct magnitude. With model calculations we demonstrate that interference of different scattering channels is key to understand the excitation energy dependence of the SERS enhancement for enhancement factors below 10 3 .

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“…Further work will involve a detailed analysis of dissipation and losses that limit the lifetime of plasmons. 9 We will also explore the effect of imperfections in the lattice on the propagation of radiation in the metasurface.…”

Section: 1117/21201411005673 Page 2/3mentioning

confidence: 99%