High-Density 2D Homo- and Hetero- Plasmonic Dimers with Universal Sub-10-nm Gaps

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• 作者：Mingliang Zhang ; Nicolas Large ; Ai Leen Koh ; Yang Cao ; Alejandro Manjavacas ; Robert Sinclair ; Peter Nordlander ; Shan X. Wang
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：September 22, 2015
• 年：2015
• 卷：9
• 期：9
• 页码：9331-9339
• 全文大小：532K
• ISSN：1936-086X

文摘

Fabrication of high-density plasmonic dimers on a large (wafer) scale is crucial for applications in surface-enhanced spectroscopy, bio- and molecular sensing, and optoelectronics. Here, we present an experimental approach based on nanoimprint lithography and shadow evaporation that allows for the fabrication of high-density, large-scale homo- (Au鈥揂u and Ag鈥揂g) and hetero- (Au鈥揂g) dimer substrates with precise and consistent sub-10-nm gaps. We performed scanning electron, scanning transmission electron, and atomic force microscopy studies along with a complete electron energy-loss spectroscopy (EELS) characterization. We observed distinct plasmonic modes on these dimers, which are well interpreted by finite-difference time-domain (FDTD) and plasmon hybridization calculations.