| Local Surface-Plasmons in Nonspherical Metal Nanoparticles |
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| 作者姓名： | 陈春翀 鲁拥华 王沛 明海 |
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| 作者单位： | Institute of Photonics, University of Science and Technology of China, Hefei 230026 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant No 10474093 and the National Basic Research Programme of China under Grant No 2006CB302900. |
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| 摘 要： | When a small metallic nanoparticle.is irradiated by incident light, the oscillating electric field can cause the conduction electrons to oscillate coherently, which excites the local surface plasmons （LSPs）. As is well known, excited LSPs can gather the energy of incident light to the surface of metallic nanoparticle. Recently, some nonspherical particles, e.g. tetrahedron, are suggested to obtain stronger localized electric field. We employ the discrete dipole approximation method to calculate the optical response of the tetrahedron nanoparticle, including the extinction and distribution of the electric field around the particle. The influences of some parameters, including the nanoparticle size, incident direction and polarization, are investigated to analyse the response modes and to obtain stronger localized electric field.
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| 关 键 词： | 非金属纳米颗粒 表面特征 光电子 介质 |
| 收稿时间： | 2007-6-15 |
| 修稿时间： | 2007-06-15 |
Local Surface-Plasmons in Nonspherical Metal Nanoparticles |
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| CHEN Chun-Chong,LU Yong-Hua,WANG Pei,MING Hai.Local Surface-Plasmons in Nonspherical Metal Nanoparticles[J].Chinese Physics Letters,2007,24(10):2987-2990. |
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| Authors: | CHEN Chun-Chong LU Yong-Hua WANG Pei MING Hai |
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| Affiliation: | Institute of Photonics, University of Science and Technology of China, Hefei 230026 |
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| Abstract: | When a small metallic nanoparticle is irradiated by incident light, the oscillating electric field can cause the conduction electrons to oscillate coherently, which excites the local surface plasmons (LSPs). As is well known, excited LSPs can gather the energy of incident light to the surface of metallic nanoparticle. Recently, some nonspherical particles, e.g. tetrahedron, are suggested to obtain stronger localized electric field. We employ the discrete dipole approximation method to calculate the optical response of the tetrahedron nanoparticle, including the extinction and distribution of the electric field around the particle. The influences of some parameters, including the nanoparticle size, incident direction and polarization, are investigated to analyse the response modes and to obtain stronger localized electric field. |
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| Keywords: | 78 67 n |
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