Optical Properties of Metallodielectric Nanostructures Calculated Using the Finite Difference Time Domain Method

and, Chris Oubre†; Nordlander, Peter

doi:10.1021/jp0473164

Cited by 298 publications

(220 citation statements)

References 40 publications

(83 reference statements)

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“…1B Left, we have also plotted the plasmon resonances obtained by a peak extraction from the extinction spectra calculated by using the finite difference time domain (FDTD) method. The FDTD method is a powerful numerical approach that has recently been shown to be highly useful in the study of the electromagnetic properties of metallic nanostructures of almost arbitrary complexity (31)(32)(33)(34)(35)(36). The FDTD simulations show geometrydependent plasmon energy shifts, which are in good agreement with the conceptually simpler and more intuitive picture provided by the plasmon hybridization approach.…”

Section: Resultssupporting

confidence: 52%

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: Resultssupporting

confidence: 52%

Symmetry breaking in individual plasmonic nanoparticles

Wang

Lassiter

et al. 2006

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

Self Cite

285

290

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“…Hybridization results in the splitting and shifting of these plasmon resonances, as a result, an anti-symmetrically coupled anti-bonding mode (ω + ) and symmetrically coupled bonding mode (ω − ) are generated in the metallic shell. Validity of this model is proven by quantum mechanical calculations and finite-difference time-domain (FDTD) simulations [36,40,41]. The plasmon hybridization model can explain the interactions between the plasmon resonances of more complex systems such as double-shell metallic nanoparticles [13].…”

Section: Introductionmentioning

confidence: 94%

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

et al. 2016

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Metallic nanostructures have received great attention due to their ability to generate surface plasmon resonances, which are collective oscillations of conduction electrons of a material excited by an electromagnetic wave. Plasmonic metal nanostructures are able to localize and manipulate the light at the nanoscale and, therefore, are attractive building blocks for various emerging applications. In particular, hollow nanostructures are promising plasmonic materials as cavities are known to have better plasmonic properties than their solid counterparts thanks to the plasmon hybridization mechanism. The hybridization of the plasmons results in the enhancement of the plasmon fields along with more homogeneous distribution as well as the reduction of localized surface plasmon resonance (LSPR) quenching due to absorption. In this review, we summarize the efforts on the synthesis of hollow metal nanostructures with an emphasis on the galvanic replacement reaction. In the second part of this review, we discuss the advancements on the characterization of plasmonic properties of hollow nanostructures, covering the single nanoparticle experiments, nanoscale characterization via electron energy-loss spectroscopy and modeling and simulation studies. Examples of the applications, i.e. sensing, surface enhanced Raman spectroscopy, photothermal ablation therapy of cancer, drug delivery or catalysis among others, where hollow nanostructures perform better than their solid counterparts, are also evaluated.

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“…It is a powerful technique for analyzing electromagnetic problems, and has been widely used in electromagnetic and optical simulations [16][17][18][19][20][21][22]. In the following FDTD simulations, TM plane waves T inc , where T denotes E and H, are generated on the total field (TF)-scattered field (SF) boundary ( Fig.…”

Section: The Fdtd Methodsmentioning

confidence: 99%

Analysis of the Optical Transmission Through the Metal Plate With Slit Array

Fu¹,

Li²,

Kong³

2008

PIER

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Abstract-The near and far field properties of the large-scale metal plate with slit array are studied by applying the finite-difference timedomain (FDTD) method. The far region scattering properties at different incident angles are also discussed. We find out the enhanced optical transmission (EOT) through the metal plate with suitable placed narrow slit array is excited by the interaction of the surface plasmon polarization (SPP) and the Fabry-Perot resonance (FPR), and the dielectric substrate has significant influence on the transmission properties by affecting the electromagnetic field distribution on the metal-dielectric interface. Furthermore, the scattering field would be reduced and the transmission efficiency could be improved by the phase shift caused by the dielectric substrate. These unusual properties suggest possible applications to light-transparent metal contacts, stealth materials, etc.

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Optical Properties of Metallodielectric Nanostructures Calculated Using the Finite Difference Time Domain Method

Cited by 298 publications

References 40 publications

Symmetry breaking in individual plasmonic nanoparticles

Symmetry breaking in individual plasmonic nanoparticles

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

Analysis of the Optical Transmission Through the Metal Plate With Slit Array

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