| Influence of Length of Opposing bi-Au Cone-Tips and Different Environment on Field Enhancement in Feed Gap |
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| 作者姓名： | 李旭峰 吴世法 |
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| 作者单位： | School of Physics and Optoelectronic Technology, Dalian Univers!ty of Technology, Dalian 116024 |
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| 基金项目： | Supported by National Natural Science Foundation of China under Grant Nos 30270367. |
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| 摘 要： | 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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| 关 键 词： | 原料气 光电子 电子技术 天线 |
| 收稿时间： | 2007-6-15 |
| 修稿时间： | 2007-06-15 |
Influence of Length of Opposing bi-Au Cone-Tips and Different Environment on Field Enhancement in Feed Gap |
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| LI Xu-Feng,WU Shi-Fa.Influence of Length of Opposing bi-Au Cone-Tips and Different Environment on Field Enhancement in Feed Gap[J].Chinese Physics Letters,2007,24(10):2891-2894. |
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| Authors: | LI Xu-Feng WU Shi-Fa |
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| Institution: | School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 |
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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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