| Original Articles |
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Influence of Length of Opposing bi-Au Cone-Tips and Different Environment on Field Enhancement in Feed Gap |
| LI Xu-Feng;WU Shi-Fa |
| School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 |
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| Cite this article: |
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LI Xu-Feng, WU Shi-Fa 2007 Chin. Phys. Lett. 24 2891-2894 |
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Abstract Electric field enhancement distributions encountered in feed gap of opposing bi-Au cone-tips is studied using a frequency-domain three-dimensional finite element method to solve Maxwell's equations of electric field distributions. Both the influences of cone-tip length and surrounding medium on electric field enhancement are investigated. The maximal enhancement value is discussed in terms of a simple physical model based on a standing wave on the tip surface associated with the antenna effect and surface plasmon. Simulated results demonstrate the enhancement is sensitive to the tip length.
By selecting a suitably matched scale according to the incident wavelength, a large enhancement value can be observed within a small focused spot between the opposing tips permitting a high spatial resolution. The relative position of the opposing tips is also found for the optimum enhancement. All of the results suggest that our configuration is suitable for the site-specific Raman spectroscopic analysis at nanoscale.
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| Keywords:
47.11.Fg
47.61.-k
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Received: 15 June 2007
Published: 20 September 2007
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| PACS: |
47.11.Fg
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(Finite element methods)
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47.61.-k
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(Micro- and nano- scale flow phenomena)
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