期刊
PHYSICA B-CONDENSED MATTER
卷 407, 期 20, 页码 4081-4085出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2012.03.053
关键词
Surface plasmon polaritons; Surface lattice resonances; Metallic nanoparticles; Coupled dipole model; Diffraction
Periodic arrays of metallic nanoparticles may sustain surface lattice resonances (SLRs), which are collective resonances associated with the diffractive coupling of localized surface plasmons 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 similar to 5 x 5 particles, the Q-factors of SLRs are lower than those of LSPRs; for arrays larger than similar to 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. (c) 2012 Elsevier B.V. All rights reserved.
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