Identification of electron-phonon coupling factor in a thin metal film subjected to an ultrashort laser pulse

• Autorzy: Majchrzak E. , Dziatkiewicz J.
• Języki publikacji: EN

Abstrakty

EN

A thin metal film subjected to a laser pulse is considered. The problem is described by the system of energy equations describing the electron gas and lattice temperatures. The thermal interactions between electrons and lattice are determined by the parameter G called the electron-phonon coupling factor. To estimate the unknown parameter G the identification problem is formulated. The additional information necessary to solve an inverse problem is the knowledge of transient measurements of the reflectivity or transmissivity variation which is proportional to the variation of the electron temperature. So, at the stage of inverse problem solution, it is possible to assume the knowledge of electrons temperature on the irradiated surface of the system (x = 0). To solve the identification problem the gradient method basing on the least squares criterion and sensitivity coefficients is used. In the final part of the paper the results of computations are shown

Słowa kluczowe

EN

microscale heat transfer; laser heating; two-temperature mode; inverse problem; finite difference method

PL

przepływ ciepła w skali mikro; nagrzewanie laserowe; model dwutemperaturowy; zagadnienie odwrotne; metoda różnic skończonych

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Computer Assisted Methods in Engineering and Science
• Rocznik: 2012
• Tom: Vol. 19, no. 4
• Strony: 383--392
• Opis fizyczny: Bibliogr. 16 poz., rys., wykr.

Twórcy

autor

Majchrzak E.

autor

Dziatkiewicz J.

• Institute of Computational Mechanics and Engineering, Silesian University of Technology Konarskiego 18a, 44-100 Gliwice, Poland,

Bibliografia

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