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Resonance capacity of surface plasmon on subwavelength metallic structures
- Ying Gu, Liangliang Chen, Haixi Zhang, Qihuang Gong,
- Original article citation: Europhys. Lett. 83," 27004 , (2008).
- Categories: Physics and Materials
- Recommended by: Limin Tong on 08/13/2008 02:50AM GMT
- Reasons for recommending:
Plasmonics — the coupling between the light and the collective oscillation of free electrons in metal — becomes one of the important branches in nanooptics due to its applications in nanodevices breaking through the diffraction limit. In this paper, Qihuang Gong and co-workers at Peking University in Beijing have provided a new method, Green’s matrix method, to directly design the surface plasmon resonances in irregular nanometer metals. By introducing the resonance capacity associated to the electric energy of a resonant nanostructure, the researchers can select those strong resonances with respect to the parameter dielectric permittivity. They used this resonance capacity to study the optical antenna and good agreement with previously reported experimental results is obtained. They also gave us an elegant way to understand the electrostatic limit. If the dimension of structure is largely below the wavelength, the resonance peaks become insensitive to the illumination wavelength. Starting from a given geometry, the proposed technique can give us the plasmon resonances information at some wavelength. Conversely, at a specific wavelength, it can also determine the geometry to which the real metal can access. So it is extremely useful to design the plasmonic structures with optical resonances in a specific spectral region.
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This method may open a route to the ab initial calculations on the effective electromangetic parameters of metamaterials, as well as plasmonic materials in long wavelength limit.