9 February 2005 Plasmon localization and local field distribution of metal nanoparticles
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Abstract
We investigate the plasmon resonances of 100nm nanowires with a non-elliptical section (a triangular metal particle) using the finite difference time domain method (FDTD). By modeling the frequency dependent dielectric response of the triangular metal particle, we find the field distribution at the surface of these wires exhibits a dramatic enhancement, up to several tens times the incident field amplitude. In particular, the strongest electric field enhancement with the greatest confinement occurs for the excitations of modes localized at the corner of the metal triangular. Bulk modes excited in the triangular particle also produce enhancement although over a larger area and with significantly less enhancement than that of the localized modes. Adding a dipole at the corner of the triangular metal particle, the field distribution at the corner of these particles exhibits a more dramatic enhancement, up to several hundreds times. These strongly localized fields can provide an important mechanism for surface enhanced Raman scattering.
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Junying Zeng, Junying Zeng, Xiaoyan Zhang, Xiaoyan Zhang, Tao Zhou, Tao Zhou, Qing Zhou, Qing Zhou, } "Plasmon localization and local field distribution of metal nanoparticles", Proc. SPIE 5635, Nanophotonics, Nanostructure, and Nanometrology, (9 February 2005); doi: 10.1117/12.577365; https://doi.org/10.1117/12.577365
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