期刊
ACS NANO
卷 9, 期 9, 页码 9331-9339出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b03090
关键词
plasmonic dimers; nanoimprint lithography; shadow evaporation; electron energy-loss spectroscopy (EELS); finite-difference time-domain (FDTD); plasmon hybridization
类别
资金
- Center for Cancer Nanotechnology Excellence [U54CA151459]
- Innovative Molecular Analysis Technologies of the National Cancer Institute [R33CA138330]
- Developmental Cancer Research Award from Stanford Cancer Center [PTA 1109905-511-PABBO]
- Robert A. Welch Foundation [C-1222]
- Cyberinfrastructure for Computational Research - NSF [CNS-0821727]
- Data Analysis and Visualization Cyberinfrastructure under NSF [OCI-0959097]
- Welch Foundation under the J. Evans Attwell-Welch Fellowship for Nanoscale Research [L-C-004]
- Army Research Office [W911NF-12-1-0407]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1542152] Funding Source: National Science Foundation
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-Au and Ag-Ag) and hetero-(Au-Ag) 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.
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