Determination of electron and phonon temperatures in gold thin film irradiated with an ultrashort laser pulse

Author:

Hayashi Ryosuke1ORCID,Iwasaki Atsushi1ORCID,Vasa Parinda2ORCID,Yamanouchi Kaoru1ORCID

Affiliation:

1. Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan

2. Department of Physics, Indian Institute of Technology Bombay, Mumbai 400076, India

Abstract

We measured transient reflectivity of single-crystalline and polycrystalline gold thin films in the wavelength region of 450–700 nm pumped by a 400 nm femtosecond pulse. The observed reflectivity changes were reproduced well by a reflectivity model that we developed based on the joint-density-of-states calculated from the band structure of gold and the Drude model. By a combination use of the reflectivity model and the two-temperature model, we evaluated the temporal evolution of the electron and phonon temperatures from the observed reflectivity changes. Based on the resultant electron and phonon temperatures, we derived the electron–phonon coupling factors, which were consistent with the literature values, in the wide range of the absorbed energy density.

Funder

Strategic Fund for Strengthening Leading-Edge Research and Development

Japan Society for the Promotion of Science

Center of Innovation Program

Department of Biotechnology, Ministry of Science and Technology, India

Science and Engineering Research Board

Department of Science and Technology, Ministry of Science and Technology, India

Wadhwani Research Center for Biotechnology

Dhananjay Joshi Endowment Fund

JSPS-DST Bilateral Joint Research Projects/Seminars

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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