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Open Access item Nanoscale force manipulation in the vicinity of a metal nanostructure

Authors:García de Abajo, F. Javier
Brixner, Tobias
Pfeiffer, Walter
Issue Date:2007
Publisher:Institute of Physics Publishing
Citation:Journal of Physics B: Atomic, Molecular and Optical Physics 40: S249-S258 (2007)
Abstract:The tight focus of Gaussian beams is commonly used to trap dielectric particles in optical tweezers. The corresponding field distribution generates a well-defined trapping potential that is only marginally controllable on a nanometre scale. Here we investigate the influence of a metal nanostructure that is located in the vicinity of the trapping focus on the trapping potential by calculating the corresponding field and force distributions. Even for an excitation wavelength that is tuned far from the plasmonic resonance of the nanostructure, the presence of the latter alters significantly the trap potential. For the given nanostructure, a ring of spheres that is illuminated in the axial direction, a smaller focus volume is observed in comparison to free focus. The superposition of this non-resonant Gaussian field with a planar wave illumination that is tuned to the plasmonic resonance gives a handle to modify the trapping potential. Polarization and intensity of the resonant illumination allows modifying the equilibrium position of the trapping potential, thus providing means to steer dielectric particles with nanometre precision. © 2007 IOP Publishing Ltd.
Identifiers:doi: 10.1088/0953-4075/40/11/S01
issn: 0953-4075
Appears in Collections:(CFMAC-IO) Artículos

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