Electron kinetics and emission for metal nanoparticles exposed to intense laser pulses

Grua, P.; Morreeuw, J. P.; Bercegol, Herve; Jonusauskas, Gediminas; Vallée, Fabrice

doi:10.1103/physrevb.68.035424

Cited by 106 publications

(124 citation statements)

References 23 publications

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“…A more sophisticated description of fs heating in coinage metal nanosystems breaks the absorption of optical energy and subsequent heating of the nanosystem into a 3-step process [18,19,29]. The first step, (1) electronic absorption, occurs when the pulse energy is absorbed by the free electron gas in the nanowire.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…This final approximation leaves us with our final set of equations to model the electron gas heating and electron-phonon thermalization steps, widely used in the literature to explain the heating of nanoparticles [17,18,19,29,31,32].…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…Most studies of optically-induced damage and femtosecond heating in gold nanosystems have been performed for spherical nanoparticles embedded in a matrix or liquid [17,18,19,20], whereas we deal with free-standing single-crystalline nanowires. Other recent studies [21] have analyzed the post damage structure of Ag nanowires after their laser-induced melting, but did not report the actual damage threshold.…”

Section: Introductionmentioning

confidence: 99%

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Optical damage threshold of Au nanowires in strong femtosecond laser fields

Summers¹,

Ramm²,

Paneru³

et al. 2014

Opt. Express

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Ultrashort, intense light pulses permit the study of nanomaterials in the optical non-linear regime, potentially leading to optoelectronics that operate in the petahertz domain. These non-linear regimes are often present just below the damage threshold thus requiring the careful tuning of laser parameters to avoid the melting and disintegration of the materials. Detailed studies of the damage threshold of nanoscale materials are therefore needed. We present results on the damage threshold of Au nanowires when illuminated by intense femtosecond pulses. These nanowires were synthesized with the directed electrochemical nanowire assembly (DENA) process in two configurations: (1) free-standing Au nanowires on W electrodes and (2) Au nanowires attached to fused silica slides. In both cases the wires have a single-crystalline structure. For laser pulses with durations of 108 fs and 32 fs at 790 nm at a repetition rate of 2 kHz, we find that the free-standing nanowires melt at intensities close to 3 TW/cm 2 and 7.5 TW/cm 2 , respectively. The Au nanowires attached to silica slides melt at slightly higher intensities, just above 10 TW/cm 2 for 32 fs pulses. Our results can be explained with an electron-phonon interaction model that describes the absorbed laser energy and subsequent heat conduction across the wire. 4702-4705 (1995). 30. G. Easley, "Generation of nonequilibrium electron and lattice temperatures in copper by picosecond laser pulses," Phys. Rev. B 33, 2144-2145 (1986). 31. Z. Lin, L. Zhigilei, and V. Celli, "Electron-phonon coupling and electron heat capacity of metals under conditions of strong electron-phonon nonequilibrium," Phys. Rev. B 77, 075133 (2008). 32. S. I. Anisimov, B. Kapeliovich, and T. Perel'man, "Electron emission from metal surfaces exposed to ultrashort laser pulses," Sov. Phys. JETP 39, 375-377 (1975

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Section: Numerical Simulationsmentioning

confidence: 99%

Section: Numerical Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optical damage threshold of Au nanowires in strong femtosecond laser fields

Summers¹,

Ramm²,

Paneru³

et al. 2014

Opt. Express

View full text Add to dashboard Cite

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“…The absorption of a fs-pulse by a metal nanoparticle can be described as a three-step process 47,48 that involves different time scales:…”

Section: Pulsed Illumination and Initial Temperature Increasementioning

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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“…Figure 10 shows fragmented particles whose diameters range from ~20 to ~30 nm. Thesenano particles generation can be caused byvarious mechanisms; nucleation of vaporised or melted material (Odachi et al, 2013), and fragmentation by coulomb explosion due to electron ejection from thermionic emission (Grua et al, 2003) or multiphoton ionisation (Kamat et al, 1998). …”

Section: Resultsmentioning

confidence: 99%

Femtosecond laser micromachining of zirconia green bodies

Shin¹,

Jeong²,

Kwon³

et al. 2017

IJASMM

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Abstract:In this study, we developed micromachining processes using a femtosecond Ti: sapphire laser for zirconia green bodies, i.e., composites comprising zirconia particles and polymer binders. The laser ablation characteristics of the zirconia composites were analysed to optimise the process. In comparison with bulk zirconia, ablation of the zirconia green bodies occurred at lower fluences. In the high-fluence regime, laser irradiation directly ablated the zirconia particles, causing aggregation of resolidified particles. The ablated depth increased with fluence (F) and overlap number (N) initially, but saturated when F and N became larger. Microchannels with a minimum width of 4 μm were fabricated. The microchannel width decreased with decreasing fluence and overlap number. Microholes, microchannels and three-dimensional structures with a size of several tens of micrometres and aspect ratio of 5-15 were successfully fabricated using the zirconia composite.

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Electron kinetics and emission for metal nanoparticles exposed to intense laser pulses

Abstract: International audienceno abstrac

Cited by 106 publications

References 23 publications

Optical damage threshold of Au nanowires in strong femtosecond laser fields

Optical damage threshold of Au nanowires in strong femtosecond laser fields

Femtosecond-pulsed optical heating of gold nanoparticles

Femtosecond laser micromachining of zirconia green bodies

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