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<p>In this work, the characteristics of a single-dye laser (LDS 821) with gold nanorods (NRs) as scattering centers were examined to better understand how random lasers operate in the near-infrared (NIR) region. The study presents the results of using Au NRs of different sizes (22.3&#xa0;nm × 7.2&#xa0;nm and 18.8&#xa0;nm × 6.3&#xa0;nm) and various concentrations (1 and 2 × 10<sup>18</sup>&#xa0;cm<sup>−3</sup>). Random laser emission was achieved from the dye using both sizes of the Au NRs and at both concentrations. However, using smaller Au NRs allowed reaching coherent emission with lower pumping energy than with larger particles. In addition, a higher concentration of these NRs ensured obtaining coherent emission at even lower pumping energy.</p>

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Near-Infrared Plasmonic Random Laser Emission Employing Gold Nanorods and LDS-821 Dye

  • 期刊论文

  • 发表日期：

    2025年2月7日

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  • J. M. Jassim,
  • M. S. Al-samak,
  • W. T. Younes,
  • Hristo Kisov

摘要

In this work, the characteristics of a single-dye laser (LDS 821) with gold nanorods (NRs) as scattering centers were examined to better understand how random lasers operate in the near-infrared (NIR) region. The study presents the results of using Au NRs of different sizes (22.3 nm × 7.2 nm and 18.8 nm × 6.3 nm) and various concentrations (1 and 2 × 1018 cm−3). Random laser emission was achieved from the dye using both sizes of the Au NRs and at both concentrations. However, using smaller Au NRs allowed reaching coherent emission with lower pumping energy than with larger particles. In addition, a higher concentration of these NRs ensured obtaining coherent emission at even lower pumping energy.