Vibrational Response of Nanorods to Ultrafast Laser Induced Heating:  Theoretical and Experimental Analysis

Hu, Min; Wang, Xuan; Hartland, Gregory V.; Mulvaney, Paul; Juste, Jorge Pérez; Sader, John E.

doi:10.1021/ja037443y

Cited by 239 publications

(487 citation statements)

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“…In the numerical analysis, we first assume isotropic heating of the free-standing nanostructure, because of superdiffusive transport effects, and then calculate the resulting expansion of the nanostructure yielding a spatially dependent displacement. We then calculate the relative amplitude of each phonon mode by decomposing the initial displacement profile into the basis of vibrational eigenmodes 32,33 . The amplitudes of the two modes when one arm length is fixed and In a symmetric nanostructure only a single phonon mode is observed (a), which is independent of the pump or probe polarization.…”

Section: Resultsmentioning

confidence: 99%

“…In the limit of high aspect ratio L x 4 4L y , the antisymmetric mode becomes similar to the extensional mode of a bar, which is efficiently excited. The symmetric mode instead has a low excitation efficiency 32 and approaches a breathing mode. The agreement between the experiments and the model indicates that the lattice heating is relatively uniform for both excitation polarizations.…”

Section: Article Nature Communications | Doi: 101038/ncomms5042mentioning

confidence: 99%

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Ultrafast acousto-plasmonic control and sensing in complex nanostructures

et al. 2014

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Coherent acoustic phonons modulate optical, electronic and mechanical properties at ultrahigh frequencies and can be exploited for applications such as ultratrace chemical detection, ultrafast lasers and transducers. Owing to their large absorption cross-sections and high sensitivities, nanoplasmonic resonators are used to generate coherent phonons up to terahertz frequencies. Generating, detecting and controlling such ultrahigh frequency phonons has been a topic of intense research. Here we report that by designing plasmonic nanostructures exhibiting multimodal phonon interference, we can detect the spatial properties of complex phonon modes below the optical wavelength through the interplay between plasmons and phonons. This allows detection of complex nanomechanical dynamics by polarization-resolved transient absorption spectroscopy. Moreover, we demonstrate that the multiple vibrational states in nanostructures can be tailored by manipulating the geometry and dynamically selected by acousto-plasmonic coherent control. This allows enhancement, detection and coherent generation of tunable strains using surface plasmons.

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Section: Resultsmentioning

confidence: 99%

Section: Article Nature Communications | Doi: 101038/ncomms5042mentioning

confidence: 99%

Ultrafast acousto-plasmonic control and sensing in complex nanostructures

et al. 2014

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“…16 Several experimental and numerical approaches aimed at studying the internal processes of heat generation under pulsed illumination and the subsequent effects observed in the surrounding medium, e.g. temperature and pressure variations, [17][18][19] acoustic wave generation, 18 vibration modes, [20][21][22] , cell apoptosis, 11 drug release 9,23 nanosurgery, 15,24 bubble formation, [25][26][27][28] NP shape modification 29 and melting, [29][30][31] nanosecondpulses for biomedical applications, 32,33 extreme thermodynamics conditions. [33][34][35][36][37] In this paper, we present and use a versatile numerical framework to investigate theoretically and numerically the evolution of the temperature distribution of a gold nanoparticle immersed in water when shined by a femtosecond-pulsed laser.…”

Section: 10mentioning

confidence: 99%

“…7f and in Eq. (20), which tends to damp the temperature increase. This trend is also observed in Fig.…”

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confidence: 99%

Femtosecond-pulsed optical heating of gold nanoparticles

2011

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We investigate theoretically and numerically the thermodynamics of gold nanoparticles immersed in water and illuminated by a femtosecond-pulsed laser at their plasmonic resonance. The spatiotemporal evolution of the temperature profile inside and outside is computed using a numerical framework based on a Runge-Kutta algorithm of the fourth order. The aim is to provide a comprehensive description of the physics of heat release of plasmonic nanoparticles under pulsed illumination, along with a simple and powerful numerical algorithm. In particular, we investigate the amplitude of the initial instantaneous temperature increase, the physical differences between pulsed and cw illuminations, the time scales governing the heat release into the surroundings, the spatial extension of the temperature distribution in the surrounding medium, the influence of a finite thermal conductivity of the gold/water interface, the influence of the pulse repetition rate of the laser, the validity of the uniform temperature approximation in the metal nanoparticle, and the optimum nanoparticle size (around 40nm) to achieve maximum temperature increase.

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“…Consequently, additional evidence on the detected mode is needed. Given that the excitation process imposes the relative amplitudes of the excited modes, one can use the initial displacement field projection on the orthogonal basis formed by the nano-object eigenmodes to identify which mode will be efficiently excited [29,30]. Here we propose to discriminate unambiguously between the different acoustic modes by probing their propaga- tion.…”

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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 Response of Nanorods to Ultrafast Laser Induced Heating: Theoretical and Experimental Analysis

Cited by 239 publications

References 43 publications

Ultrafast acousto-plasmonic control and sensing in complex nanostructures

Ultrafast acousto-plasmonic control and sensing in complex nanostructures

Femtosecond-pulsed optical heating of gold nanoparticles

Backward propagating acoustic waves in single gold nanobeams

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