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Theory and dynamical simulations of fast laser-induced self-organization and design of plasmonic nanocomposites for applications in energy harvesting.

机译：快速激光诱导的自组织的理论和动力学模拟以及用于能量收集的等离激元纳米复合材料的设计。

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摘要

Metallic, nanosized particles exhibit novel electromagnetic properties that have potential uses in a broad range of applications, including efficiency enhancement of and selective spectral response in photovoltaic devices. Fast pulsed-laser induced dewetting of nanoscopic metal films is a promising avenue to economically fabricate ordered nanoparticles and presents a platform to investigate multi-physics, nonlinear dynamical systems. Irradiating metal films 30 nm with a uniformly intense laser beam induces pattern formation that exhibits short range spatial order and possesses a characteristic length scale that are tunable through experimental parameters. The interplay between the thin-film optics, thermal diffusion, and hydrodynamics all dictate the parameters that can be tuned and their effect on the final morphology and characteristic length scales of the dewetting system.;In this dissertation, a new mechanism for self-organization of nanoscopic metal nanoparticles on transparent substrates via uniform beam laser-induced dewetting of ultrathin metal films with thickness spanning from 2 to 20 nm was investigated. Comparison with collaborative experimental data shows that such a model predicts the emergence of a decreasing characteristic length scale in stark contrast from that predicted by classical dewetting analysis derived from polymer literature. In addition, a mixing approach developed collaboratively was discussed which successfully predicted the optical absorption response of ternary nanocomposites from published experimental data. This approach has been extended and used to predict the optical response of quaternary nanocomposites. This approach acts as a novel way of predicting the plasmonic optical response of multi-metal nanocomposite systems consisting of spherical, metal nanoparticles embedded in host dielectrics with potential applications including solar energy harvesting and selective spectral filtering.
机译：金属的纳米级颗粒具有新颖的电磁特性，在许多应用中具有潜在用途，包括提高光伏器件的效率和选择性光谱响应。快速脉冲激光诱导的纳米金属膜去湿是经济地制造有序纳米颗粒的有前途的途径，并提供了一个研究多物理场，非线性动力学系统的平台。用均一强度的激光束照射<30 nm的金属膜会导致图形形成，该图形显示出短距离的空间顺序，并具有可通过实验参数进行调整的特征长度尺度。薄膜光学，热扩散和流体动力学之间的相互作用共同决定了可以调节的参数，以及它们对除湿系统的最终形态和特征长度尺度的影响。通过均匀束激光诱导的厚度范围为2至20 nm的超薄金属膜的去湿，研究了透明基材上的纳米金属纳米颗粒的形成。与协作实验数据的比较表明，这种模型与由聚合物文献衍生的经典去湿分析所预测的特征长度尺度形成鲜明对比，可以预测特征长度尺度的减小。此外，讨论了共同开发的混合方法，该方法可从已发表的实验数据成功预测三元纳米复合材料的光吸收响应。该方法已被扩展并用于预测四级纳米复合材料的光学响应。这种方法是一种预测多金属纳米复合材料系统等离子光响应的新颖方法，该系统由嵌入主体电介质中的球形金属纳米颗粒组成，具有潜在的应用前景，包括太阳能收集和选择性光谱过滤。

著录项

  • 作者

    Trice, Justin Robert.;

  • 作者单位

    Washington University in St. Louis.;

  • 授予单位 Washington University in St. Louis.;
  • 学科 Engineering Electronics and Electrical.;Energy.;Physics Optics.;Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 155 p.
  • 总页数 155
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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