期刊
ACS NANO
卷 9, 期 6, 页码 6428-6435出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b02087
关键词
charge transfer plasmon; optical antenna; IR plasmon; electric current; single-particle dark-field spectroscopy; electron beam lithography
类别
资金
- Robert A. Welch Foundation [C-1220, C-1222]
- National Security Science and Engineering Faculty Fellowship (NSSEFF) [N00244-09-1-0067]
- Defense Threat Reduction Agency (DTRA) [HDTRA1-11-1-0040]
- Air Force Office of Scientific Research (AFOSR) [FA9550-10-1-0469]
- Army [MURI W911NF-12-1-0407]
A charge transfer plasmon (CTP) appears when an optical-frequency conductive pathway between two metallic nanoparticles is established, enabling the transfer of charge between nanoparticles when the plasmon is excited. Here we investigate the properties of the CTP in a nanowire-bridged dimer geometry. Varying the junction geometry controls its conductance, which modifies the resonance energies and scattering intensities of the CTP while also altering the other plasmon modes of the nanostructure. Reducing the junction conductance shifts this resonance to substantially lower energies in the near- and mid-infrared regions of the spectrum. The CTP offers both a high-information probe of optical frequency conductances in nanoscale junctions and a new, unique approach to controllably engineering tunable plasmon modes at infrared wavelengths.
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