Can Copper Nanostructures Sustain High-Quality Plasmons?

@article{Mkhitaryan2021CanCN,
  title={Can Copper Nanostructures Sustain High-Quality Plasmons?},
  author={Vahagn Mkhitaryan and Katia March and Eric Nestor Tseng and Xiaoyan Li and Leonardo Scarabelli and Luis M. Liz‐Marz{\'a}n and Shih-Yun Chen and Luiz Henrique Galv{\~a}o Tizei and Odile St{\'e}phan and Jenn-Ming Song and Mathieu Kociak and F. Javier Garc{\'i}a de abajo and Alexandre Gloter},
  journal={Nano letters},
  year={2021}
}
Silver, king among plasmonic materials, features low inelastic absorption in the visible-infrared (vis-IR) spectral region compared to other metals. In contrast, copper is commonly regarded as too lossy for actual applications. Here, we demonstrate vis-IR plasmons with quality factors >60 in long copper nanowires (NWs), as determined by electron energy-loss spectroscopy. We explain this result by noticing that most of the electromagnetic energy in these plasmons lies outside the metal, thus… 

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