Vibrational Dynamics of Silver Nanocubes and Nanowires Studied by Single-Particle Transient Absorption Spectroscopy

Staleva, Hristina; Hartland, Gregory V.

doi:10.1002/adfm.200800605

Cited by 81 publications

(131 citation statements)

References 54 publications

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“…Unlike the 8 GHz case, these insets permit a direct and convincing comparison of the damping time of the oscillations between the two cases as the oscillation lifetime is shorter than the time delay between the two longitudinal echoes. Thus, this damping time can be accurately determined and reaches τ = 0.2 ns in transmission to be compared to τ = 0.3 ns in the frontside configuration, which corresponds to a quality factor Q = πf 0 τ ∼ 30 in good adequation with previous studies on supported metallic nanowires [24,37]. A pseudocolor x − t spatiotemporal surface displacement mapping along the spatial direction x is presented in the Figure 4c.…”

supporting

confidence: 76%

Spatiotemporal Imaging of the Acoustic Field Emitted by a Single Copper Nanowire

et al. 2016

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The monochromatic and geometrically anisotropic acoustic field generated by 400 nm and 120 nm diameter copper nanowires simply dropped on a 10 µm silicon membrane is investigated in transmission using three-dimensional time-resolved femtosecond pump-probe experiments. Two pump-probe time-resolved experiments are carried out at the same time on both side of the silicon substrate. In reflection, the first radial breathing mode of the nanowire is excited and detected. In transmission, the longitudinal and shear waves are observed. The longitudinal signal is followed by a monochromatic component associated with the relaxation of the nanowire's first radial breathing mode. Finite Difference Time Domain (FDTD) simulations are performed and accurately reproduce the diffracted field. A shape anisotropy resulting from the large aspect ratio of the nanowire is detected in the acoustic field. The orientation of the underlying nanowires is thus acoustically deduced.

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supporting

confidence: 76%

Spatiotemporal Imaging of the Acoustic Field Emitted by a Single Copper Nanowire

et al. 2016

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“…All quality factors reported in this review have been adapted from the original publications to be consistent with this definition. Whereas Zijlsta et al [82] used the definition given above, Staleva et al [15,89,90] used , corresponding to the decay of the amplitude of the oscillations. Van Dijk et al [71] defined the quality factor as , where is the FWHM of the frequency peak in the power spectrum (square of the Fourier Transform) of the detected vibration trace.…”

Section: Nanospheres (Gold)mentioning

confidence: 99%

“…Very recently, Staleva et al studied the vibrational dynamics of single silver nanowires [15,90]. The nanowires were prepared using a polyol process which yielded 5-fold twinned structures with a mean diameter of 70 nm and lengths ranging from 2 to 20 μm.…”

Section: Nanowires (Silver)mentioning

confidence: 99%

“…As a large variety of shapes can be produced by different methods [7,8], the properties of the particles can be tailored and designed for particular purposes. This makes metal nanoparticles an important class of materials for technological applications, in particular for probing the mechanical properties of biological [9,10] and soft matter [11][12][13], and potentially for mass sensing [14,15]. Most of these applications are based on the sensitivity of the mechanical and thermal properties of the nanoparticle to its morphology and to its local environment.…”

Section: Introductionmentioning

confidence: 99%

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Probing the acoustic vibrations of single metal nanoparticles by ultrashort laser pulses

Tchebotareva¹,

Ruijgrok

Zijlstra

et al. 2010

Laser & Photonics Reviews

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The strong interaction of metal nanoparticles with light makes it possible to detect individual particles by farfield optical methods. In this article, the interaction of a metal nanoparticle with a short laser pulse is discussed, with the emphasis on the coherent excitation of mechanical (acoustic) modes and the optical detection of these vibrations. The literature on acoustic vibrations of single metal nanoparticles of different shapes (spheres, dumbbells, rods, cubes, wires, prisms) is reviewed, and the modes that have been excited and detected in these particles are discussed. Finally, the insights and potential applications enabled by these studies are summarized.Single gold nanorod and its acoustic vibrations detected by pump-probe spectroscopy. Top: vibration trace of the nanorod (inset: Electron Microscopy image of a 30 90 nm gold nanorod). Bottom: vibrational response as a function of the probe wavelength.

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“…In such an approach, acoustic modes are excited by the absorption of a femtosecond laser pulse and detected in transmission [2,3] or reflectivity geometry in near [4,5] or far [6,7] field by the induced change in the material optical properties. As ensemble studies result in inhomogeneous broadening of the acoustic features[8, 9], single particle spectroscopy has been considered to circumvent this drawback and to clarify the acoustic response [3,10,11]. However, the strong damping at these extremely high frequencies has led several groups to isolate the nanoresonators from their substrate to avoid energy leaking through the nanoobject-substrate contact [12][13][14].…”

mentioning

confidence: 99%

Backward propagating acoustic waves in single gold nanobeams

Chazelas

Belliard

Becerra

et al. 2015

Applied Physics Letters

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Femtosecond pump-probe spectroscopy has been carried out on suspended gold nanostructures with a rectangular cross section lithographed on a silicon substrate. With a thickness fixed to 110 nm and a width ranging from 200 nm to 800 nm, size dependent measurements are used to distinguish which confined acoustic modes are detected. Furthermore, in order to avoid any ambiguity due to the measurement uncertainties on both the frequency and size, pump and probe beams are also spatially shifted to detect guided acoustic phonons. This leads us to the observation of backward propagating acoustic phonons in the gigahertz range (∼ 3 GHz) in such nanostructures. While backward wave propagation in elastic waveguides has been predicted and already observed at the macroscale, very few studies have been done at the nanoscale. Here, we show that these backward waves can be used as the unique signature of the width dilatational acoustic mode.Probing the elasticity at the nanoscale is a challenge that led a wide community to study confined acoustic modes of nano-objects in the 10 GHz-1 THz range using time-resolved pump-probe experiments [1]. In such an approach, acoustic modes are excited by the absorption of a femtosecond laser pulse and detected in transmission [2,3] or reflectivity geometry in near [4,5] or far [6,7] field by the induced change in the material optical properties. As ensemble studies result in inhomogeneous broadening of the acoustic features[8, 9], single particle spectroscopy has been considered to circumvent this drawback and to clarify the acoustic response [3,10,11]. However, the strong damping at these extremely high frequencies has led several groups to isolate the nanoresonators from their substrate to avoid energy leaking through the nanoobject-substrate contact [12][13][14]. These breakthroughs have made possible the observation of an other source of acoustic energy leaks. Indeed, it has been proven that acoustic phonons are also guided along the nanoobjects [15,16]. Other major developments illustrate the possibility to use nano-objects as nanoscale acoustic transducers for hypersonic wave imaging [17]. Non destructive imaging with nanometric resolution in both depth and lateral direction is now one step ahead.Furthermore, there is a recent and growing interest in both the electromagnetic and acoustic wave communities for materials and waveguides that exhibit backward propagating waves [18]. In backward waves, the phase velocity describing the propagation of individual wave fronts in a wave packet and the energy flux of the wave, characterized by the Poynting vector are anti-parallel. This anti-parallel propagation constitutes the definition of a negative index material and opens the way to a large variety of intriguing physical phenomena [19]. There now exist multiple experimental evidences of this effect, and applications of negative index materials for electromagnetic waves have already been conceived [20]. The pos- * Laurent.Belliard@upmc.fr sibility of such backward wave motion in elastic waveg...

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Vibrational Dynamics of Silver Nanocubes and Nanowires Studied by Single-Particle Transient Absorption Spectroscopy

Cited by 81 publications

References 54 publications

Spatiotemporal Imaging of the Acoustic Field Emitted by a Single Copper Nanowire

Spatiotemporal Imaging of the Acoustic Field Emitted by a Single Copper Nanowire

Probing the acoustic vibrations of single metal nanoparticles by ultrashort laser pulses

Backward propagating acoustic waves in single gold nanobeams

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