Coherent Longitudinal Acoustic Phonons in Three-Dimensional Supracrystals of Cobalt Nanocrystals

Lisiecki, Isabelle; Polli, Dario; Ye, Cong; Soavi, Giancarlo; Duval, E.; Cerullo, Giulio; Pileni, Marie‐Paule

doi:10.1021/nl4028704

Cited by 38 publications

(48 citation statements)

References 41 publications

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“…Because laser-excited hot electrons are confined in the gold nanoparticles, these observations indicate that the acoustic phonons are very likely induced by ultrafast heating of the superlattice assisted by a collective plasmon-polariton propagation. While individual vibrations of nanoparticles assemblies have been reported earlier [20,21] or narrowband Brillouin mode in semitransparent cobalt superlattice [22], our results demonstrate that it is possible to generate propagating broadband coherent acoustic phonons in plasmonic NPS.…”

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confidence: 39%

Ultrafast acousto-plasmonics in gold nanoparticle superlattices

et al. 2015

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We report the investigation of the generation and detection of GHz coherent acoustic phonons in plasmonic gold nanoparticles superlattices (NPS). The experiments have been performed from an optical femtosecond pump-probe scheme across the optical plasmon resonance of the superlattice. Our experiments allow to estimate the collective elastic response (sound velocity) of the NPS as well as an estimate of the nano-contact elastic stiffness. It appears that the light-induced coherent acoustic phonon pulse has a typical in-depth spatial extension of about 45 nm which is roughly 4 times the optical skin depth in gold. The modeling of the transient optical reflectivity indicates that the mechanism of phonon generation is achieved through ultrafast heating of the NPS assisted by light excitation of the volume plasmon. These results demonstrate how it is possible to map the photon-electron-phonon interaction in subwavelength nanostructures.PACS numbers: 78.67. Pt, 73.20.Mf, Plasmon assisted subwavelength light transmission is a key physical mechanism for modern nano-optics and nano-plasmonics [1]. The propagation of plasmonpolariton waves in nano particles nanostructures (chains, arrays) is at the core of intense fundamental investigations and has led to numerous reports [2-6]. For plasmonic applications, it is obviously crucial to understand and control the damping of these plasmonpolariton waves, i.e. the collective propagation distance. This propagation distance as well as a more general description of the dispersion curves for both longitudinal and transverse light electric field have already been obtained for supported 1D chains [2][3][4][5]. The propagation distance is currently limited by the intrinsic electronphonon, electron-defect interaction within each particle as well as radiation loss. In some particular 2D optical spectroscopy imaging, it has been shown recently that the propagation/distribution of the plasmon-polariton could even be mapped for 1D nanoparticles chains [2,6]. The visualization of these plasmons at the interface air/nanostructure with near-field imaging [5] or with an electron beam imaging [7] were also reported. This stateof-art 2D imaging is however limited to 1D or 2D systems, i.e. to surface plasmonics and no local measurement of volume plasmon-polariton propagation has been reported for 3D nanoparticles arrays so far. Most of the plasmonic responses in nanoparticles superlattices are obtained indeed from far field optical absorbance measurements [8,9]. Because of the difficulty to probe the innner part of a plasmonic superlattices, no quantitative depth profiling description of the plasmon-polariton propagation have been reported to date. However, it is known that ultrafast optical techniques can provide a picture in time and space of the light-matter interaction [10][11][12]. In particular, in case of femtosecond light pulses, the light-matter coupling can lead to the emission of coherent acoustic phonons that occurs all over the spatial extension where the light energy is converted in...

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supporting

confidence: 39%

Ultrafast acousto-plasmonics in gold nanoparticle superlattices

et al. 2015

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“…Progress in understanding the interaction of light with the lattice dynamics of materials has favored the development of coherent acoustic phonon sources (SASER) [154] and advances in fast terahertz spectroscopic techniques and imaging, to probe nanostructures [176], composite materials and interfaces [169], and even biological systems [171]. Photons and phonons couple in optomechanical cavities and resonators, which provide access to quantum phenomena [5], paving the way to quantum state variables.…”

Section: Discussionmentioning

confidence: 99%

“…Probing the interfaces and the nano-contact (adhesion) has also become a challenge in nanometrology due to the fact that new functional materials are artificial materials assembled of different layers. It has been possible to evaluate the role of contacts between two solids (van der Waals, covalent bonds) on the transmission of coherent acoustic phonons at interfaces [166,[172][173][174] and on the sound velocity in arrays of nanoparticles [175,176] (see Fig. 7) by measuring the time of flight of coherent acoustic phonons in various nanostructures.…”

Section: Probing Nanostructures and Phonon Dynamicsmentioning

confidence: 99%

Nanophononics: state of the art and perspectives

et al. 2016

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Abstract. Understanding and controlling vibrations in condensed matter is emerging as an essential necessity both at fundamental level and for the development of a broad variety of technological applications. Intelligent design of the band structure and transport properties of phonons at the nanoscale and of their interactions with electrons and photons impact the efficiency of nanoelectronic systems and thermoelectric materials, permit the exploration of quantum phenomena with micro-and nanoscale resonators, and provide new tools for spectroscopy and imaging. In this colloquium we assess the state of the art of nanophononics, describing the recent achievements and the open challenges in nanoscale heat transport, coherent phonon generation and exploitation, and in nano-and optomechanics. We also underline the links among the diverse communities involved in the study of nanoscale phonons, pointing out the common goals and opportunities.

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“…Similarly to atomic interaction in a crystal, this interparticle coupling is expected to lead to collective low-frequency oscillations in a supracrystal (corresponding to its acoustic modes), that have been detected in time domain experiments in supracrystal formed by 6 nm cobalt nanospheres [220]. Characterization of longitudinal acoustic wave propagation in such cobalt supracrystals was recently reported, yielding estimation of a moderate value of sound velocity resulting from the weak coupling and large mass of the particles, and exhibiting a large temperature dependence ascribed to temperature-dependent elastic properties of the surfactant molecules [221].…”

Section: Interacting Nano-objectsmentioning

confidence: 95%