Ultrafast heat transfer on nanoscale in thin gold films

Heat transfer processes, induced by ultrashort laser pulses in thin gold films, were studied with a time...

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Main Authors: Poletkin, Kirill V., Gurzadyan, Gagik G., Shang, J., Kulish, Vladimir.
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2012
Subjects:
Online Access:https://hdl.handle.net/10356/85639
http://hdl.handle.net/10220/7525
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-856392023-03-04T17:15:28Z Ultrafast heat transfer on nanoscale in thin gold films Poletkin, Kirill V. Gurzadyan, Gagik G. Shang, J. Kulish, Vladimir. School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering::Fluid mechanics Heat transfer processes, induced by ultrashort laser pulses in thin gold films, were studied with a time resolution of 50 fs. It is demonstrated that in thin gold films heat is transmitted by means of electron–phonon and phonon–phonon interactions, and dissipated on nanoscale within 800 fs. Measurements show that the electron–phonon relaxation time varies versus the probe wavelength from 1.6 to 0.8 ps for λ = 560–630 nm. Applied mathematical model is a result of transforming the two-temperature model to the hyperbolic heat equation, based on assumptions that the electron gas is heated up instantaneously and applying Cattaneo’s law to the phonon subsystem, agrees well with the experimental results. This model allows us to define time of electron–phonon scattering as the ratio of the heat penetration depth to the speed of sound in the bulk material that, in turn, provides an explanation of experimental results that show the dependence of the electron–phonon relaxation time on the wavelength. Accepted version 2012-02-15T07:00:16Z 2019-12-06T16:07:39Z 2012-02-15T07:00:16Z 2019-12-06T16:07:39Z 2012 2012 Journal Article Poletkin, K. V., Gurzadyan, G. G., Shang, J., & Kulish, V. (2012). Ultrafast heat transfer on nanoscale in thin gold films. Applied Physics B: Lasers and Optics, 107(1), 137-143. https://hdl.handle.net/10356/85639 http://hdl.handle.net/10220/7525 10.1007/s00340-011-4862-z 157900 en Applied physics B: lasers and optics © 2011 Springer-Verlag. This is the author created version of a work that has been peer reviewed and accepted for publication by Applied Physics B: Lasers and Optics, Springer-Verlag. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1007/s00340-011-4862-z]. 26 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering::Fluid mechanics
spellingShingle DRNTU::Engineering::Mechanical engineering::Fluid mechanics
Poletkin, Kirill V.
Gurzadyan, Gagik G.
Shang, J.
Kulish, Vladimir.
Ultrafast heat transfer on nanoscale in thin gold films
description Heat transfer processes, induced by ultrashort laser pulses in thin gold films, were studied with a time resolution of 50 fs. It is demonstrated that in thin gold films heat is transmitted by means of electron–phonon and phonon–phonon interactions, and dissipated on nanoscale within 800 fs. Measurements show that the electron–phonon relaxation time varies versus the probe wavelength from 1.6 to 0.8 ps for λ = 560–630 nm. Applied mathematical model is a result of transforming the two-temperature model to the hyperbolic heat equation, based on assumptions that the electron gas is heated up instantaneously and applying Cattaneo’s law to the phonon subsystem, agrees well with the experimental results. This model allows us to define time of electron–phonon scattering as the ratio of the heat penetration depth to the speed of sound in the bulk material that, in turn, provides an explanation of experimental results that show the dependence of the electron–phonon relaxation time on the wavelength.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Poletkin, Kirill V.
Gurzadyan, Gagik G.
Shang, J.
Kulish, Vladimir.
format Article
author Poletkin, Kirill V.
Gurzadyan, Gagik G.
Shang, J.
Kulish, Vladimir.
author_sort Poletkin, Kirill V.
title Ultrafast heat transfer on nanoscale in thin gold films
title_short Ultrafast heat transfer on nanoscale in thin gold films
title_full Ultrafast heat transfer on nanoscale in thin gold films
title_fullStr Ultrafast heat transfer on nanoscale in thin gold films
title_full_unstemmed Ultrafast heat transfer on nanoscale in thin gold films
title_sort ultrafast heat transfer on nanoscale in thin gold films
publishDate 2012
url https://hdl.handle.net/10356/85639
http://hdl.handle.net/10220/7525
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