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Local Surface-Plasmons in Nonspherical Metal Nanoparticles |
| CHEN Chun-Chong;LU Yong-Hua;WANG Pei;MING Hai |
| Institute of Photonics, University of Science and Technology of China, Hefei 230026 |
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| Cite this article: |
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CHEN Chun-Chong, LU Yong-Hua, WANG Pei et al 2007 Chin. Phys. Lett. 24 2987-2990 |
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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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78.67.n
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Received: 15 June 2007
Published: 20 September 2007
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