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Palpant, Bruno
CentraleSupélec
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Publications (9/9 displayed)
- 2024Numerical Modeling of the Ultrafast Plasmonic Response of Titanium Nitride Nanostructures
- 2013Anomalous thermal conductivity by surface phonon-polaritons of polar nano thin films due to their asymmetric surrounding mediacitations
- 2013Selective Cold Welding of Colloidal Gold Nanorodscitations
- 2012Thermo-optical properties of embedded silver nanoparticlescitations
- 2008Gold nanoparticle assemblies: Thermal behaviour under optical excitationcitations
- 2008Gold nanoparticle assemblies: Interplay between thermal effects and optical response
- 2008Cooling Dynamics of a Gold Nanoparticle in a Host Medium Under Ultrafast Laser Pulse Excitation: A Ballistic-Diffusive Approach
- 2004Thermal response of nanocomposite materials under pulsed laser excitationcitations
- 2002Local electric field enhancements and large third-order optical nonlinearity in nanocomposite materialscitations
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article
Cooling Dynamics of a Gold Nanoparticle in a Host Medium Under Ultrafast Laser Pulse Excitation: A Ballistic-Diffusive Approach
Abstract
We present a numerical model allowing to determine the electron and lattice temperature dynamics in a gold nanoparticle under subpicosecond pulsed excitation, as well as that of the surrounding medium. For this, we have used the electron-phonon coupling equation in the particle with a source term linked with the laser pulse, and the ballistic-diffusive equations for heat conduction in the host medium. Our results show that the heat transfer rate from the particle to the matrix is significantly smaller than the prediction of Fourier's law. Consequently, the particle temperature rise is much larger and its cooling dynamics is much slower than that obtained using Fourier's law, which is attributed to the nonlocal and nonequilibrium heat conduction in the vicinity of the nanoparticle. These results are expected to be of great importance for interpreting pump-probe experiments performed on single nanoparticles or nanocomposite media.