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Effect of hot electron kinetics on self-reflectivity of warm dense gold irradiated with femtosecond laser pulses

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Title
Effect of hot electron kinetics on self-reflectivity of warm dense gold irradiated with femtosecond laser pulses
Author(s)
Minju Kim; Jung, Jae Hyung; Seong Hyeok Yang; Cho, Min Sang; Gyeongbo Kang; Gyusang Lee; Jong-Won Lee; Suhyeon Lee; Sohn, Janghyeob; Byoung Ick Cho
Publication Date
2021-09
Journal
APPLIED SURFACE SCIENCE, v.561
Publisher
Elsevier B.V.
Abstract
© 2021 Elsevier B.V.Above the damage threshold of Au nanofoil, experimental and theoretical investigations of the fluence-dependent self-reflection of intense femtosecond laser pulses are presented. Measured reflectance shows not only the fluence-dependency, but also the laser pulse duration dependency, which is barely described by the calculation of dielectric function of high-temperature Au, based on the traditional two-temperature model. A simple hot electron kinetic model, which contains a nonthermalized electronic subsystem cooperated with the two-temperature model, is considered to determine transient electron densities and temperature to calculate the dielectric functions and self-reflection of femtosecond laser pulses. Comparison to experimental data shows the effect of hot electrons with a relaxation time of a few hundreds of femtoseconds on the transient optical properties of gold under a strong excitation.
URI
https://pr.ibs.re.kr/handle/8788114/9955
DOI
10.1016/j.apsusc.2021.150073
ISSN
0169-4332
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > 1. Journal Papers (저널논문)
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