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<p>This paper investigates the effect of pulsed laser irradiation on the optical properties of thin near-surface layers of Ge<sub>1-x</sub>Si<sub>x</sub> (x = 0.85) solid solutions in the spectral range of (0.2–25)·10⁻⁶ m. It was found that laser treatment with energy densities ranging from 46.6 to 163.5&#xa0;mJ/cm² at a wavelength of λ = 532&#xa0;nm leads to structural gettering, increased reflectivity, and modification of the optical characteristics of near-surface layers. The mechanisms of absorption and interaction of laser radiation with impurities and defects were analyzed, revealing the formation of neutral complexes and a reduction in the intensity of impurity scattering processes. The results correlate with experimental data from transmission, reflection, and absorption spectra. The primary effects of laser irradiation occur in the valence and conduction bands of the material. These findings are promising for developing advanced methods for modifying the optical properties of functional materials in electronic technology.</p>

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Effect of Laser Irradiation on the Optical Properties of Thin Near-Surface Layers of Ge1-xSix (X = 0.85) Solid Solutions

  • 期刊论文

  • 发表日期：

    2025年5月22日

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  • Liubomyr Demchyna,
  • Anastasiia Minyailo,
  • Mykola Vuichyk,
  • Petro Gentsar,
  • Serhii Levytskyi,
  • Oleksandr Vlasenko

摘要

This paper investigates the effect of pulsed laser irradiation on the optical properties of thin near-surface layers of Ge1-xSix (x = 0.85) solid solutions in the spectral range of (0.2–25)·10⁻⁶ m. It was found that laser treatment with energy densities ranging from 46.6 to 163.5 mJ/cm² at a wavelength of λ = 532 nm leads to structural gettering, increased reflectivity, and modification of the optical characteristics of near-surface layers. The mechanisms of absorption and interaction of laser radiation with impurities and defects were analyzed, revealing the formation of neutral complexes and a reduction in the intensity of impurity scattering processes. The results correlate with experimental data from transmission, reflection, and absorption spectra. The primary effects of laser irradiation occur in the valence and conduction bands of the material. These findings are promising for developing advanced methods for modifying the optical properties of functional materials in electronic technology.