Abstract
We obtained experimentally strong plasmon interactions between localized surface plasmon with delocalized surface plasmon polaritons in a new nanosystem of silver semishells island film arrays arranged as a closed-packing structure coupled to an adjacent thin silver film. We show that plasmon interactions for such a nanosystem exhibits two pronounced resonances and interpret the coupling in terms of Fano resonances. The higher energy resonance is identified as a symmetric hybridization mode between localized plasmon resonances in the island semishell array and surface plasmon polaritons in the metal film and while the lower energy resonance is identified as a corresponding anti-symmetric hybridization mode. Increasing the size of the particle arrays enhances and red shifts the resonances. We show that adding a dielectric spacer between the semishell island array and the metal film results in a red shifting of the resonances and introduce an additional high energy spectral peak. The effect of the spacer layer is interpreted as a reduced hybridization and the generation of additional localized surface plasmon resonances.
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Acknowledgments
This work was financed by grants from the Danish National research council (FNU 09-065929), the Innovation Consortium GENIUS, and the EU FP7 project INGENIOUS NMP4-SL-2009-248236.
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Maaroof, A.I., Nygaard, J.V. & Sutherland, D.S. Plasmon Hybridization in Silver Nanoislands as Semishells Arrays Coupled to a Thin Metallic Film. Plasmonics 6, 419–425 (2011). https://doi.org/10.1007/s11468-011-9220-9
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DOI: https://doi.org/10.1007/s11468-011-9220-9