期刊
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
卷 15, 期 2, 页码 1815-1820出版社
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2015.9065
关键词
Gold; Double Nanotubes; Plasmon Shift; Local Field Enhancement; Infrared Wavelength Region
类别
资金
- Special Prophase Project on the National Basic Research Program of China [2011CB311807]
- Natural Science Basic Research Plan in Shaanxi Province of China [2010JQ1004]
- Fundamental Research Funds for the Central Universities and the Research foundation for advanced talents of Southern Medical University [B1000365]
The effect of inserted gold nanotube on the localized surface plasmon resonance (LSPR) shifting and local electric field enhancement of concentric gold double nanotubes has been studied by using the quasi-static electricity. Because of the combined effect from inter-surface and inter-tube plasmon coupling, the LSPR in gold double nanotubes could be easily tuned into the infrared wavelength region. The calculation results indicate the plasmon peak shifting is quite sensitive to the thickness of the inner gold tube and the gap between the inner and outer gold tubes. The physical mechanism has been attributed to the local field effect of the separate dielectric layer. Because of the additional attraction from the inner gold tube to the free electrons at outer gold tube, the decreasing electric field in the middle dielectric spacer layer reduces the restoring force and lead to intense red shift of LSPR.
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