Abstract
We present an intuitive theoretical description of the optical properties of a complex metal nanostructure, consisting of two nanoshells connected by a nanorod giving a dumbbell-like appearance. The simulations were done using the finite element method. The effects of the length and radius of the nanorods and of the dimensions of the nanoshells on the plasmon properties of the system were analyzed. The peak position and intensities in the absorption spectra were found to have a strong dependence on the geometrical parameters of the dumbbell. This study provides evidence that the localized surface plasmon modes play a key role in the broadband light harvesting capabilities of these nanostructures, and this is promising for a wide range of practical applications, for example in surface-enhanced spectroscopies.
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