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arXiv · 1305.3134

Collective resonances in plasmonic crystals: Size matters

S. R. K. Rodriguez·M. C. Schaafsma·A. Berrier·J. Gomez Rivas
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Abstract

Periodic arrays of metallic nanoparticles may sustain Surface Lattice Resonances (SLRs), which are collective resonances associated with the diffractive coupling of Localized Surface Plasmon Resonances (LSPRs). By investigating a series of arrays with varying number of particles, we traced the evolution of SLRs to its origins. Polarization resolved extinction spectra of arrays formed by a few nanoparticles were measured, and found to be in very good agreement with calculations based on a coupled dipole model. Finite size effects on the optical properties of the arrays are observed, and our results provide insight into the characteristic length scales for collective plasmonic effects: for arrays smaller than 5 x 5 particles, the Q-factors of SLRs are lower than those of LSPRs; for arrays larger than 20 x 20 particles, the Q-factors of SLRs saturate at a much larger value than those of LSPRs; in between, the Q-factors of SLRs are an increasing function of the number of particles in the array.

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S. R. K. Rodriguez, M. C. Schaafsma, A. Berrier, J. Gomez Rivas. 2013-05-14. Collective resonances in plasmonic crystals: Size matters. https://doi.org/10.1016/j.physb.2012.03.053

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