TY - JOUR
T1 - Collective resonances in plasmonic crystals : size matters
AU - Rodriguez, S.R.K.
AU - Schaafsma, M.C.
AU - Berrier, A.
AU - Gomez Rivas, J.
PY - 2012
Y1 - 2012
N2 - Periodic arrays of metallic nanoparticles may sustain surface lattice resonances (SLRs), which are collectiveresonances 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 collectiveplasmonic effects: for arrays smaller than ~5×5 particles, the Q-factors of SLRs are lower than those of LSPRs; for arrays larger than ~20×20 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.
AB - Periodic arrays of metallic nanoparticles may sustain surface lattice resonances (SLRs), which are collectiveresonances 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 collectiveplasmonic effects: for arrays smaller than ~5×5 particles, the Q-factors of SLRs are lower than those of LSPRs; for arrays larger than ~20×20 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.
U2 - 10.1016/j.physb.2012.03.053
DO - 10.1016/j.physb.2012.03.053
M3 - Article
SN - 0921-4526
VL - 407
SP - 4081
EP - 4085
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
IS - 20
ER -