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<p>In this paper, we propose a new application in laser cleaning for gold (Au), silver (Ag), and aluminum (Al) cultural relics using SPP mode in the ultraviolet (UV) region. Noble transition metals Au and Ag have chemical properties that are much less active than metal Al. However, their light-matter interaction is much higher than that of Al, with higher absorption efficiency. The photothermal and photochemical ablation is much better and more interesting for Au and Ag, and the efficiency is enhanced with 25.4% coupling and higher cleaning efficiency. The SPP mode on noble transition metals shows a negative mode loss contribution for the dirt layer with complex dispersion relations. We believe this new generation waveguide-based SPP mode laser cleaning concept can have a significant theoretical and practical contribution to the improvement of traditional laser cleaning applications.</p>

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Surface plasma with complex dispersion in UV region: the new applications in laser cleaning for gold, silver and aluminum cultural relics

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • Jiamin Liu,
  • Chenyuan Yuan,
  • Jie Wu,
  • Guoying Feng,
  • Haibing Yuan

摘要

In this paper, we propose a new application in laser cleaning for gold (Au), silver (Ag), and aluminum (Al) cultural relics using SPP mode in the ultraviolet (UV) region. Noble transition metals Au and Ag have chemical properties that are much less active than metal Al. However, their light-matter interaction is much higher than that of Al, with higher absorption efficiency. The photothermal and photochemical ablation is much better and more interesting for Au and Ag, and the efficiency is enhanced with 25.4% coupling and higher cleaning efficiency. The SPP mode on noble transition metals shows a negative mode loss contribution for the dirt layer with complex dispersion relations. We believe this new generation waveguide-based SPP mode laser cleaning concept can have a significant theoretical and practical contribution to the improvement of traditional laser cleaning applications.