Study of femtosecond pulsed laser heating of bilayer metallic films at various laser angles of incidences and polarizations using the two-temperature model

Authors

  • Jesse Rudyll B. Grefal ⋅ PH National Institute of Physics, University of the Philippines Diliman
  • Lean L. Dasallas ⋅ PH Materials Science and Engineering Program, University of the Philippines Diliman
  • Wilson O. Garcia ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

We examine the thermal heating behavior of gold-copper bilayer thin metal targets treated under femtosecond single-pulse laser irradiation using the one-dimensional two-temperature model. A comparison is made between the spatiotemporal evolution of lattice temperatures of gold single layer and gold-copper bilayers. Moreover, the effects of the laser angles of incidence and polarization on the electron and lattice temperatures are studied. Dynamic optical properties are included within the laser source term to effectively describe the oblique angle of incidence configurations with the use of the finite element method. We found that the addition of the copper layer does have a minimal effect on the surface temperature of the gold target. At higher angles of incidence, the surface temperatures of the irradiated targets reduce due to changes in the effective laser beam spot size and fluence. P-polarized laser beams, which have electric fields aligned along the laser beam propagation direction, induce higher temperatures through resonant absorption compared to s-polarized laser beams which have electric fields oscillating along the film surface.

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Article ID

SPP-2023-PA-12

Section

Poster Session A (Materials Science, Instrumentation, and Photonics)

Published

2023-07-07

How to Cite

[1]
JRB Grefal, LL Dasallas, and WO Garcia, Study of femtosecond pulsed laser heating of bilayer metallic films at various laser angles of incidences and polarizations using the two-temperature model, Proceedings of the Samahang Pisika ng Pilipinas 41, SPP-2023-PA-12 (2023). URL: https://proceedings.spp-online.org/article/view/SPP-2023-PA-12.