Plasmon hybridization in nanoshell dimers

Brandl, Daniel; Oubre, Chris; Nordlander, Peter

doi:10.1063/1.1949169

Cited by 106 publications

(113 citation statements)

References 36 publications

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“…The quantities of C lm and S lm are the amplitudes of the primitive cavity and sphere plasmons, respectively. For finite offset D, the spherical harmonics centered on the two different origins are no longer orthogonal for different l, resulting in interactions between the cavity and sphere modes in a manner analogous to the coupling between the individual nanoparticle plasmons of a nanoparticle dimer or in periodic structures of metallic nanoparticles in close proximity (28)(29)(30) As in the case of nanoparticle dimers, the azimuthal index m remains conserved. The Lagrangian for this system can be constructed directly from .…”

Section: Resultsmentioning

confidence: 99%

Symmetry breaking in individual plasmonic nanoparticles

Wang

Lassiter

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

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The plasmon resonances of a concentric metallic nanoshell arise from the hybridization of primitive plasmon modes of the same angular momentum on its inner and outer surfaces. For a nanoshell with an offset core, the reduction in symmetry relaxes these selection rules, allowing for an admixture of dipolar components in all plasmon modes of the particle. This metallodielectric nanostructure with reduced symmetry exhibits a core offset-dependent multipeaked spectrum, seen in single-particle spectroscopic measurements, and exhibits significantly larger local-field enhancements on its external surface than the equivalent concentric spherical nanostructure.nanostructures ͉ plasmon hybridization ͉ spectroscopy T he optical properties of metallic nanostructures are a topic of considerable scientific and technological importance. The optical properties of a metallic nanoparticle are determined by its plasmon resonances, which are strongly dependent on particle geometry. The structural tunability of plasmon resonances has been one of the reasons for the growing interest in a rapidly expanding array of nanoparticle geometries, such as nanorods (1, 2), nanorings (3), nanocubes (4, 5), triangular nanoprisms (6-8), nanoshells (9), and branched nanocrystals (10, 11). The resonant excitation of plasmons can lead to large local enhancements of the incident electromagnetic field at the nanoparticle surface, resulting in dramatically large enhancements of the cross section for nonlinear optical spectroscopies such as surface-enhanced Raman scattering (12-16). The structural dependence of both the local-field and far-field optical properties of nanoparticles across the visible and near-infrared (NIR) spectral regions has enabled their use in a wide range of biomedical applications, an area of increasing importance and societal impact (17-21).Metallic nanoshells, composed of a spherical dielectric core surrounded by a concentric metal shell, support plasmon resonances whose energies are determined sensitively by inner core and outer shell dimensions (9). This geometric dependence arises from the hybridization between cavity plasmons supported by the inner surface of the shell and the sphere plasmons of the outer surface (22,23). This interaction results in the formation of two hybridized plasmons, a low-energy symmetric or ''bonding'' plasmon and a high-energy antisymmetric or ''antibonding'' plasmon mode. The bonding plasmon interacts strongly with an incident optical field, whereas the antibonding plasmon mode interacts only weakly with the incident light and can be further damped by the interband transitions in the metal (24). For a spherically symmetric nanoshell, where the center of the inner shell surface is coincident with the center of the outer shell surface, plasmon hybridization only occurs between cavity and sphere plasmon states of the same angular momentum, denoted by multipolar index l (⌬l ϭ 0). In the dipole, or electrostatic limit, only the l ϭ 1 dipolar bonding plasmon is excited by an incident optical plane wave ...

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Section: Resultsmentioning

confidence: 99%

Symmetry breaking in individual plasmonic nanoparticles

Wang

Lassiter

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

288

290

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“…For example, the wavelength range can be largely tuned to infrared by adopting coreϪshell NPs. 26 More practically, a SPM tip (metal coated or NP www.acsnano.org embedded) 27Ϫ29 scanning over a NP dimer can function as a third particle in a trimer antenna. Nanoparticles could also be manipulated by an AFM tip.…”

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Multiple-Particle Nanoantennas for Enormous Enhancement and Polarization Control of Light Emission

et al. 2009

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We investigate the light emission from dipolar emitters located within nanoparticle antennas. It is found that the enormous emission enhancement can reach nearly a million fold. For multinanoparticle antennas, the polarization of the emissions strongly depends on the geometry of the antennas, the emitted wavelengths, and the dielectric functions of surrounding media. It is shown that a polarization nanorotator, which modulates the emission polarization on the nanometer scale, can be readily realized by varying either the geometry or surrounding media of nanoparticle antennas.

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“…We pick a small silver nanosphere dimer and include all primitive nanosphere plasmon modes up to an lmax = 20 to ensure convergence [47,46]. The PH method expresses the complex potential induced by a dipolar excitation source as the superposition of the potentials generated by each primitive plasmon mode [19,47]:…”

Section: Electric Field Enhancementsmentioning

confidence: 99%

Plasmon hybridization for real metals

2010

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Plasmon Hybridization in Real Metals by Kui BaoBy treating free electrons in metallic nanostructures as incompressible and irrotational fluid, Plasmon hybridization (PH) method can be used as a very useful tool in interpolating the electric magnetic behaviors of complex metallic nanostructures.Using PH theory and Finite Element Method (FEM), we theoretically investigated the optical properties of some complex nanostructrus induding coupled nanoparticle aggregates and nanowires.We investigated the plasmonic properties of a symmetric silver sphere heptamer and showed that the extinction spectrum exhibited a narrow Fano resonance. Using the plasmon hybridization approach and group theory we showed that this Fano resonance is caused by the interference of two bonding dipolar subradiant and superradiant plasmon modes of El u symmetry. We investigate the effect of structural symmetry breaking and show that the energy and shape of the Fano resonance can be tuned over a broad wavelength range. We show that the wavelength of the Fano resonance depends very sensitively on the dielectric permittivity of the surrounding media.Besides heptamer, we also used plasmon hybridization method and finite element method to investigate the plasmonic properties of silver or gold nano spherical clusters. For symmetric clusters, we show how group theory can be used to identify the microscopic nature of the plasmon resonances. For larger dusters, we show that narrow Fano resonances are frequently present in their optical spectra. As an example of asymmetric clusters, we demonstrate that clusters of four identical spherical particles support strong Fano-like interference. This feature is highly sensitive to the polarization of the incident electric field due to orientation-dependent coupling between particles in the cluster.~anowire plasmons can be launched by illumination at one terminus of the nanowire and emission can be detected at the other end of the wire. \Vith PH theory we can predict how the polarization of the emitted light depends on the polarization of the incident light. Depending on termination shape, a nanowire can serve as either a polarization-maintaining waveguide, or as a polarization-rotating, nanoscale halfwave plate. \Ve also investigated how the properties of a nearby substrate modify the excitation and propagation of plasmons in subwavelength silver wires.

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Plasmon hybridization in nanoshell dimers

Cited by 106 publications

References 36 publications

Symmetry breaking in individual plasmonic nanoparticles

Symmetry breaking in individual plasmonic nanoparticles

Multiple-Particle Nanoantennas for Enormous Enhancement and Polarization Control of Light Emission

Plasmon hybridization for real metals

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