Collective resonances in plasmonic crystals: Size matters
| Autor: | Rodriguez, S. R. K., Schaafsma, M. C., Berrier, A., Rivas, J. Gomez |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Physica B Condensed Matter 407, 4081-4085 (2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.physb.2012.03.053 |
| Popis: | 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. Comment: 4 figures |
| Databáze: | arXiv |
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