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Green's matrix method as well as the newly defined resonance capacity of surface plasmon are presented and applied to select the strong resonances for arbitrary shaped subwavelength metallic structures. The resonance capacity distributions for a certain structure type make it possible to tailor the metallic resonant properties in the selected wavelength. Moreover, the resonance capacity is found to be almost immune to the incident wavelength for a definite structure zoomed in or out in the subwavelength scale . Our numerical calculations are also in agreement with the previous experimental results on nanoantennas.
Gu et al. (2008) studied this question.