...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Bulk and surface plasmons in highly nanoporous gold films
【24h】

Bulk and surface plasmons in highly nanoporous gold films

机译：纳米多孔金膜中的体等离子体和表面等离子体

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The far field plasmonic behaviour of nanoporous gold films with void densities ranging from 60% to 90% has been investigated and modelled. These layers have good dc conductivity and quite different nanostructure to traditional porous layers in which the metal percolates. Our gold films with void density f above 70% have high thermal emittance for a conductor at their thicknesses and their flat spectral response at visible and near infrared wavelengths is not metal like. We derive effective optical constants which become plasmonic at wavelengths between 1.8 and 4 mu m for f from 72 to 87%. This onset is much longer than that in bulk gold. For void densities below 70% the onset of plasmonic behaviour is much closer to the dense material. A simple test is implemented to test for surface plasmon polaritons (SPPs) under illumination. The more porous films show no evidence of SPP, while the less porous films display weak evidence. Thus by tailoring void content in these nanostructures we can tailor the onset of effective plasmonic response across a wide range from 0.8 to 4 mu m and emittance from around 0.9 down to low values. An effective uniform metal response is thus found in the presence of surface nanostructure without the interface absorption found in dense gold layers with structured surfaces.
机译：已经研究和建模了具有60％至90％空隙密度的纳米多孔金膜的远场等离子体行为。与金属渗透的传统多孔层相比，这些层具有良好的直流电导率和非常不同的纳米结构。我们的空密度为f大于70％的金膜在厚度上具有高的导体热发射率，并且它们在可见光和近红外波长下的平坦光谱响应不像金属。我们得出有效的光学常数，该常数在72到87％的f范围内在1.8和4μm的波长之间变为等离子体。这种发作比散装黄金的发作要长得多。对于低于70％的空隙密度，等离激元行为的开始更接近致密材料。实施了一个简单的测试来测试照明下的表面等离激元极化子（SPP）。多孔性越强的膜就没有显示SPP的迹象，而多孔性越弱的膜则显示出较弱的证据。因此，通过调整这些纳米结构中的空隙含量，我们可以在0.8至4微米的宽范围内以及从0.9左右的低发射率范围内调整有效等离子体响应的开始。因此在存在表面纳米结构的情况下发现有效的均匀金属响应，而在具有结构化表面的致密金层中没有发现界面吸收。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号