论文：近场和远场金半连续薄膜的实验探索
Thesis: Experimental exploration of gold semi-continuous films in the near- and far-field
摘要：
金属纳米结构可以支持所谓的等离子体振荡（等离子体激元）。等离子体允许光的能量集中，其大小远低于光学已知的传统衍射极限。因此，等离子体允许在纳米级的新的光学应用过多。在这篇论文中，我们研究了半连续金薄膜（也称为渗滤薄膜）的光学和等离子体性质。这些薄膜由纳米尺度上复杂的曲折分形图案组成。它们是制造金属纳米结构的简单，快速和可扩展的方法。我们表明，尽管它们的整体几何形状非常复杂，但大部分薄膜的性质可以单独基于它们的强烈局部等离子体“热点”来理解-薄膜中只有几纳米的区域，其中光场增强了几千倍。此外，我们表明，这种薄膜可以用于增强金的双光子光致发光和白光连续产生。我们还表明，它是可能的，通过飞秒激光脉冲，写入信息到薄膜中，通过光热过程。这对于超密度信息存储和等离子体彩色激光打印具有潜在的应用。
英文摘要：
Metallic nanostructures can support so-called plasma oscillations (plasmons). Plasmons allow for the concentration of the energy from light, down to sizes well below the conventional diffraction limit known from optics. Plasmonics thus allows for a plethora of new optical applications at the nanoscale. In this thesis, we have investigated the optical and plasmonic properties of semi-continuous gold films (also called percolation films). These films consist of complex tortuous fractal patterns on the nanoscale. They are an easy, fast, and scalable method to fabricate metallic nanostructures. We show, that despite their very complex overall geometry, a large part of the films' properties can be understood alone based on their strongly localized plasmonic 'hotspots' - areas of just a few nanometres in the films, wherein optical fields are enhanced several thousand times. Additionally, we show that such films can be used for the enhancement of gold two-photon photoluminescence and white light continuum generation. We have also shown that it is possible, via femtosecond-laser pulses, to inscribe information into the films, via phototheral processes. This has potential applications for ultra-dense information storage, and plasmonic colour laser printing.
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