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A numerically the optical forces between noble metal nanoparticles sustaining localized surface
plasmon resonances has been investigated. The results first point out enhanced binding optical forces compared with dielectric
nanoparticles and nonresonant metallic nanoparticles. It is also shown here that under suitable illumination conditions,
short-range forces tend to make the nanoparticles cluster, leading to intense and localized hot spots
in the interstices. This effect corroborates recent experimental observations of an enhanced Raman signal in
trapped metal sphere ensembles.
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