Ultrafast optical detection of coherent acoustic phonons emission driven by superdiffusive hot electrons

Lejman, Mariusz; Shalagatskyi, Viktor; Kovalenko, Oleksandr; Pézeril, Thomas; Temnov, Vasily V.; Ruello, P.

doi:10.1364/josab.31.000282

Cited by 32 publications

(24 citation statements)

References 47 publications

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“…Because the gold nanostructures of interest here are significantly larger, the assumption of diffusive transport for gold phonon is well justified (some alternatives have been proposed in [73]). In contrast, it has been shown experimentally that the electron mean free path in gold is δ = 100 nm [74][75][76][77], which is above the typical size of the nanoparticle considered in this work. In view of this quasi-ballistic nature of the transport, we assumed that the electronic temperature T e is uniform all across the metallic region (see Eq.…”

Section: B Discussionmentioning

confidence: 57%

Enhanced Heat Transfer with Metal-Dielectric Core-Shell Nanoparticles

et al. 2020

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Heat transfer from irradiated metallic nanoparticles is relevant to a broad array of applications ranging from water desalination to photoacoustics. The efficacy of such processes relies on the ability of these nanoparticles to absorb the pulsed illuminating light and to quickly transfer energy to the environment. Here we show that compared to homogeneous gold nanoparticles having the same size, gold-silica core-shell nanoparticles enable heat transfers to liquid water that are faster. We reach this conclusion by considering both analytical and numerical calculations. The key factor explaining enhanced heat transfer is the direct interfacial coupling between metal electrons and silica phonons. We discuss how to obtain fast heating of water in the vicinity of the particle and show that optimal conditions involve nanoparticles with thin silica shells irradiated by ultrafast laser pulses. Our findings should serve as guides for the optimization of thermoplasmonic applications of core-shell nanoparticles.

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Section: B Discussionmentioning

confidence: 57%

Enhanced Heat Transfer with Metal-Dielectric Core-Shell Nanoparticles

et al. 2020

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“…This process is usually the main mechanism for the generation of coherent acoustic phonons in metals [111,112]. The volume of the material, where this lattice heating takes place, is sometimes larger than the volume given by the absorption length of the optical pump pulse due to hot electron diffusion [124][125][126][127]. The ultrafast lattice heating generates both longitudinal and transverse acoustic phonons providing an appropriate symmetry breaking in the crystal for the generation of transverse modes [128,129].…”

Section: Coherent Phonon Sources: Electron-photon-phonon Interactionsmentioning

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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“…Among the numerous studies investigating acoustic wave generation, most of them have been conducted in metals, semiconductors and nanostructures made of them. Several mechanisms and phenomena have been revealed, including thermoelastic coupling driven by hot carriers 16,17 , electrostriction 18,19 , electronic deformation potential (also called electronic pressure) 1,20,21 , as well as piezoelectric coupling [22][23][24][25] . Moreover, in most of these studies the photogenerated longitudinal acoustic (LA) phonon has a stronger amplitude than the shear or transverse acoustic (TA) one limiting the spectrum of applications of coherent acoustic waves.…”

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confidence: 99%

Giant ultrafast photo-induced shear strain in ferroelectric BiFeO3

Lejman¹,

Vaudel²,

Infante³

et al. 2014

Nat Commun

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149

154

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Generation of strain using light is a key issue for future development of ultrasonic devices. Up to now, photo-induced GHz-THz acoustic phonons have been mainly explored in metals and semiconductors, and in artificial nanostructures to enhance their phononic emission. However, despite their inherent strong polarization (providing natural asymmetry) and superior piezoelectric properties, ferroelectric oxides have been only poorly regarded. Here, by using ultrafast optical pump-probe measurements, we show that photogeneration/photodetection of coherent phonons in BiFeO3 ferroelectric leads, at room temperature, to the largest intensity ratio ever reported of GHz transverse acoustic wave versus the longitudinal one. It is found that the major mechanism involved corresponds to screening of the internal electric fields by light-induced charges, which in turn induces stress by inverse piezoelectric effect. This giant opto-acoustic response opens new perspectives for the use of ferroelectric oxides in ultrahigh frequency acoustic devices and the development of new GHz-THz acoustic sources.

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Ultrafast optical detection of coherent acoustic phonons emission driven by superdiffusive hot electrons

Cited by 32 publications

References 47 publications

Enhanced Heat Transfer with Metal-Dielectric Core-Shell Nanoparticles

Enhanced Heat Transfer with Metal-Dielectric Core-Shell Nanoparticles

Nanophononics: state of the art and perspectives

Giant ultrafast photo-induced shear strain in ferroelectric BiFeO3

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