dc.contributor.authorPoletkin, Kirill V.
dc.contributor.authorGurzadyan, Gagik G.
dc.contributor.authorShang, J.
dc.contributor.authorKulish, Vladimir.
dc.identifier.citationPoletkin, 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.en_US
dc.description.abstractHeat 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.en_US
dc.format.extent26 p.en_US
dc.relation.ispartofseriesApplied physics B: lasers and opticsen_US
dc.rights© 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].en_US
dc.subjectDRNTU::Engineering::Mechanical engineering::Fluid mechanics
dc.titleUltrafast heat transfer on nanoscale in thin gold filmsen_US
dc.typeJournal Article
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.description.versionAccepted versionen_US
dc.contributor.organizationSchool of Physical and Mathematical Sciencesen_US

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