Abstract
We study the plasmonic properties of silver–silica–silver multilayer nanoshells using finite-difference time-domain methods. Silver is a weakly dissipating metal and is able to support higher order resonances compared to strongly dissipating metals like gold. We show that Fano resonances occur even in symmetric cases. Symmetry breaking via the introduction of core offset further enhances these Fano resonance peaks and leads to the appearance of higher order resonances. The optical properties of the multilayer nanoshells are explained using the plasmon hybridization theory and the results are compared to similar multilayer nanoshells with gold core and outer shell.
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Acknowledgements
The authors would like to acknowledge the financial support of the grant JCOAG03-FG04-2009 from the Joint Council of Agency for Science, Technology and Research (A*STAR) of Singapore, and the grant TSRP-1021520018 from the Science and Engineering Research Council (SERC) of A*STAR of Singapore.
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Ho, J.F., Luk’yanchuk, B. & Zhang, J.B. Tunable Fano resonances in silver–silica–silver multilayer nanoshells. Appl. Phys. A 107, 133–137 (2012). https://doi.org/10.1007/s00339-012-6757-1
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DOI: https://doi.org/10.1007/s00339-012-6757-1