Electromagnetic field amplification in Al/Ag spherical nanostructures
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The localized electromagnetic field of multilayered nanoshells is studied using quasi-static approach and plasmon hybridization theory. The absorption spectrum of concentric metal–dielectric–metal nanostructures shows three plasmon resonance peaks which are optimized by tuning the geometrical parameters. It has been found that the three-layered nanoshells present different surface plasmon mode when the metal type of inner core and outer shell is exchanged. Silver and aluminum metals have stronger and sharper plasmon modes than that of gold and the outer silver shell has a greater effect on the total plasmonic properties of nanoshell. Three separated plasmon peaks of absorption spectrum of Al–Dielectric–Ag nanoshell cover a wide range from UV to NIR region. In addition, the optimal geometry is discussed to obtain the highest electromagnetic field enhancement in Al–dielectric–Ag nanoshell with special properties.
- 21.C.F. Bohren, D.R. Huffman, Absorption and Scattering of Light by Small Particles (Wiley, New York, 1983)Google Scholar