Systematic Study of Antibonding Modes in Gold Nanorod Dimers and Trimers

Osberg, Kyle D.; Harris, Nadine; Özel, Tuncay; Ku, Jessie C.; Schatz, George C.; Mirkin, Chad A.

doi:10.1021/nl503207j

Cited by 55 publications

(52 citation statements)

References 51 publications

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“…In previous research, the antibonding mode was usually coupled by TM longitudinal-type waves because of the property of breaking symmetry202122. However, in our study, the antibonding mode could be coupled by oblique TE polarization transverse-type waves, demonstrating that TE transverse waves can also break the symmetry of NAs when the dimers orientation is transverse to the polarization of incident field.…”

contrasting

confidence: 61%

Evanescent Wave-Assisted Symmetry Breaking of Gold Dipolar Nanoantennas

Yang

Chen

2016

Sci Rep

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Symmetry-breaking and scattering cancellation were observed in the dark-mode resonance of dipolar gold nanoantennas (NAs) on glass substrates coupled with oblique incidence and total internal reflection. With the assistance of evanescent waves, the coupling efficiency was twice as strong when the incidence angle was larger than the critical angle. The Hamiltonian equation and absorption spectra were used to analyze the hybridization model of symmetric dipolar gold NAs. The antibonding mode could be coupled successfully by both transverse-magnetic (TM) and transverse-electric (TE) polarizations to NAs when the dimers orientation is parallel to the propagation direction of evanescent waves.

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contrasting

confidence: 61%

Evanescent Wave-Assisted Symmetry Breaking of Gold Dipolar Nanoantennas

Yang

Chen

2016

Sci Rep

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“…For a fixed emission wavelength λ = 400 nm, the emission pattern of a dipole located at the gap center of a nanoantenna evolves with the length of the nanoantenna arms, from a dipole emission for L = 110 nm to a quadrupole emission for L = 190 nm, Figure 2b, d, and f. This evolution is due to the mode distribution at λ = 400 nm, where higher order modes can be excited for longer antennas (see the evolution of the near-field intensity in Figure 3). 63,64 For low energy molecular vibrations, the strong incident laser light makes the direct observation of the weak SERS signal almost impossible. Indeed, suitable optical filters are required to reject the strong excitation laser to clearly observe Raman lines with a spectrometer.…”

Section: ■ Numerical Methodsmentioning

confidence: 99%

Surface-Enhanced Hyper-Raman Scattering: A New Road to the Observation of Low Energy Molecular Vibrations

Butet

Martin

2015

J. Phys. Chem. C

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The plasmon enhancement of molecular hyperRaman scattering, the nonlinear counterpart of Raman scattering, which involves the absorption of two fundamental photons, is investigated with emphasis on low energy molecular vibrations. The two-photon excitation of the molecule is treated using its hyperpolarizability β, and the emission of the hyperRaman photons is computed using a dipole emitter located at the molecule position. The electromagnetic response of the plasmonic systems is evaluated using a surface integral equation method, which makes possible considering both planewave and dipole excitations in a single formalism. Taking into account different geometries (including multiresonant antennas and silver heptamers supporting Fano resonances), the experimental parameters influencing the enhancement of the molecular hyperRaman scattering are discussed in detail. In particular, it is shown that a good excitation at the fundamental stage is not sufficient for reaching a good enhancement factor and that an optimization of the electromagnetic response of the plasmonic substrate is also important at the emission wavelength. The competition between the molecular hyper-Raman scattering signal and the background signal, that is, the second harmonic generation, is discussed. The latter can be reduced in specific structures by taking advantages of the key role played by the symmetry of the structure for hyper-Raman scattering and second harmonic generation. This way, we propose a nanostructure where the second harmonic generation can be reduced in the detection direction, enabling the hyper-Raman scattering signal from single donor−acceptor "push−pull" chromophores to be experimentally recorded with a low noise level using surface-enhanced hyper-Raman scattering. It is particularly remarkable that the hyper-Raman signal from one molecule can be stronger than the second harmonic generation from a complete plasmonic nanostructure, despite the considerable volume difference between both nano-objects. This fundamental observation stems from the different selection rules for both nonlinear optical processes.

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“…The most common and simplistic case of plasmon hybridization is a dimer of two closely located nanostructures [21], and the term is widely used to explain the interaction between two solid nanostructures or the interaction between the nanostructure and the environment, i.e. the substrate [22][23][24][25][26][27][28][29][30][31][32][33][34][35]. In this review, we will focus on the plasmon hybridization in hollow nanostructures [13,20,[36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

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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Systematic Study of Antibonding Modes in Gold Nanorod Dimers and Trimers

Cited by 55 publications

References 51 publications

Evanescent Wave-Assisted Symmetry Breaking of Gold Dipolar Nanoantennas

Evanescent Wave-Assisted Symmetry Breaking of Gold Dipolar Nanoantennas

Surface-Enhanced Hyper-Raman Scattering: A New Road to the Observation of Low Energy Molecular Vibrations

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

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