Numerical Modeling of Acousto–Plasmonic Coupling in Metallic Nanoparticles

Saison-Francioso, Ophélie; Lévêque, Gaëtan; Akjouj, Abdellatif

doi:10.1021/acs.jpcc.0c00874

Cited by 17 publications

(15 citation statements)

References 50 publications

(81 reference statements)

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“…The low-frequency mode for our Au nanocubes shows similar characteristics to the reported experimental and simulation results for large Ag nanocubes. , The high-frequency mode II represents a breathing mode with large displacements in the face-to-face and edge-to-edge directions, similar to the overtone breathing mode of Ag nanocubes with the main displacement only in face-to-face direction . In the TA measurements of metal nanoparticles, the detected vibrational modes resulted from the coupling effect of phonon and plasmon modes. , The low-frequency mode could be detected due to the high sensitivity of the plasmon band to the tips of the nanocubes. The coupling of phonon and plasmon modes became the strongest when the regions of the strongest EM field (plasmon mode) and the largest displacement (phonon mode) overlapped .…”

Section: Resultssupporting

confidence: 79%

“…20 In the TA measurements of metal nanoparticles, the detected vibrational modes resulted from the coupling effect of phonon and plasmon modes. 6,26 The low-frequency mode could be detected due to the high sensitivity of the plasmon band to the tips of the nanocubes. The coupling of phonon and plasmon modes became the strongest when the regions of the strongest EM field (plasmon mode) and the largest displacement (phonon mode) overlapped.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Similar to Au nanospheres, the breathing mode induced a plasmonic shift, mainly due to photoelastic coupling. 26 The spectral shifts induced by the two modes are plotted in the upper panel of Figure 2c. The amplitude of the spectral shift for mode I is smaller than that of the high-frequency mode II, as shown by the results in Table 1, in good agreement with the amplitude of each mode by FFT, as shown in Figure 2d.…”

Section: ■ Introductionmentioning

confidence: 99%

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Morphology-Dependent Coherent Acoustic Phonon Vibrations and Phonon Beat of Au Nanopolyhedrons

et al. 2021

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Coherent acoustic phonon vibrations of Au nanopolyhedrons, including nanocubes, nano-octahedrons, and nanocuboctahedrons, in aqueous solutions and poly(vinyl alcohol) (PVA) films, were investigated using transient absorption (TA) spectroscopy combined with finite element analysis based on continuum elastic theory. In each type of nanopolyhedron, two vibrational modes with similar quality factors (Qs) and phases were observed, suggesting that both were induced by thermal expansion. The low-frequency vibrational mode represents a tipto-tip displacement in each nanopolyhedron, whereas the high-frequency mode is the breathing vibration of the whole particle and reveals morphology dependence, displaying a face-to-face displacement in nanocuboctahedrons, an edge-to-edge displacement in nano-octahedrons, and a combination of face-to-face and edge-toedge displacements in nanocubes. Moreover, a clear phonon beat was identified in the two vibrational modes of the nanocuboctahedrons. Our experimental results provide a possible application of morphology-controllable metal nanoresonators.

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Section: Resultssupporting

confidence: 79%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Morphology-Dependent Coherent Acoustic Phonon Vibrations and Phonon Beat of Au Nanopolyhedrons

et al. 2021

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“…This work, together with previous ones on single plasmonic nanoparticles, shows that the transient optical response induced by the optical excitation, internal thermalization, and cooling of metal nanoparticles is now well understood and can be quantitatively modeled at all relevant time scales. In the future, similar experiments might be performed to better understand the sensitivity of time-resolved signals to nanoparticle vibrations, a more complex process (as each vibrational mode is associated with a specific, nonuniform nanoparticle deformation), which has recently been the theme of numerical studies. , Extending the quantitative investigations of the optical, mechanical, and thermal properties of nano-objects produced by electron beam lithography as described in this paper and earlier ones ,, to nano-objects produced by colloidal chemistry (which typically display less crystalline defects) would also be very interesting to better understand the impact of crystallinity on the physical response of nano-objects. ,, …”

Section: Discussionmentioning

confidence: 89%

Electron and Lattice Heating Contributions to the Transient Optical Response of a Single Plasmonic Nano-Object

et al. 2021

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The sudden absorption of light by a metal nanoparticle launches a series of relaxation processes (internal thermalization, acoustic vibrations and cooling) which induce a transient modification of its optical response. In this work, the transient optical response associated to the internal thermalization of a single gold nanodisk (occurring on a few picoseconds timescale) was quantitatively investigated by time-resolved spectroscopy experiments, and the measured signals were compared with a model accounting for the effects of both electron and ionic lattice heating. We show that experimental timeresolved signals at delays posterior to nanodisk excitation and electron gas thermalization can be simply interpreted as a combination of electron and lattice temperature evolutions, with probe wavelength-dependent weights. This demonstrates the possibility to selectively probe the electronic or lattice dynamics, through the choice of specific probe wavelengths. Additionally, the timedependent spectral shape of transient extinction cross-section changes is shown to be successively dominated by the effect of electron and lattice heating, which present distinct spectral signatures.

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“…Albeit the operating λ 0 does not match λ r , the LSP mode can yet be excited but off resonance meaning that the OM coupling can still take place. It originates from two physical mechanisms, the so-called moving interface (MI) and the photoelastic (PE) effect. − In the case of MI, a local change of the electric permittivity is induced near the surface, whereas the PE effect operates in the bulk of the material. The expressions for the OM coefficients, g MI and g PE , are obtained based on a first-order perturbation theory , and from the knowledge of the acoustic and optical fields in the NP (Section S4).…”

Section: Resultsmentioning

confidence: 99%

Optomechanic Coupling in Ag Polymer Nanocomposite Films

et al. 2021

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Particle vibrational spectroscopy has emerged as a new tool for the measurement of elasticity, glass transition, and interactions at a nanoscale. For colloid-based materials, however, the weakly localized particle resonances in a fluid or solid medium renders their detection difficult. The strong amplification of the inelastic light scattering near surface plasmon resonance of metallic nanoparticles (NPs) allowed not only the detection of single NP eigenvibrations but also the interparticle interaction effects on the acoustic vibrations of NPs mediated by strong optomechanical coupling. The “rattling” and quadrupolar modes of Ag/polymer and polymer-grafted Ag NPs with different diameters in their assemblies are probed by Brillouin light spectroscopy (BLS). We present thorough theoretical 3D calculations for anisotropic Ag elasticity to quantify the frequency and intensity of the “rattling” mode and hence its BLS activity for different interparticle separations and matrix rigidity. Theoretically, a liquidlike environment, e.g., poly(isobutylene) (PIB) does not support rattling vibration of Ag dimers but unexpectedly hardening of the extremely confined graft melt renders both activation of the former and a frequency blue shift of the fundamental quadrupolar mode in the grafted nanoparticle Ag@PIB film.

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Numerical Modeling of Acousto–Plasmonic Coupling in Metallic Nanoparticles

Abstract: We describe a computational approach to study the acousto-plasmonic coupling in metallic nanoparticles. We use the high level multiphysics finite element software FreeFEM developed at

Cited by 17 publications

References 50 publications

Morphology-Dependent Coherent Acoustic Phonon Vibrations and Phonon Beat of Au Nanopolyhedrons

Morphology-Dependent Coherent Acoustic Phonon Vibrations and Phonon Beat of Au Nanopolyhedrons

Electron and Lattice Heating Contributions to the Transient Optical Response of a Single Plasmonic Nano-Object

Optomechanic Coupling in Ag Polymer Nanocomposite Films

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