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Proceedings Paper

Optical manipulation of plasmonic nanoparticles using laser tweezers
Author(s): Lianming Tong; Vladimir D. Miljković; Mikael Käll
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Paper Abstract

Plasmonic nanoparticles, typically gold and silver colloids, can be trapped by a highly focused Gaussian beam. The behavior of the particles in an optical trap, such as the alignment, stability and interaction between particles, depends on their plasmonic nature, determined by the correlation between the size, shape and material of the particles, and the wavelength and polarization of the trapping laser. For instance, an elongated nanoparticle aligns parallel to the polarization of a NIR trapping laser to minimize the optical potential energy. However, nanowires tend to align perpendicular to the polarization. A dimer of two isotropic nanoparticles in principle acts similar to a nanorod with its "long axis" (dimer axis) parallel to the laser polarization. These results are evidenced by dark-field scattering imaging and spectra, and agree well with discrete dipole approximation simulations of the near-fields around different nanostructures. Elongated nanoparticles, dimers and nanowires all rotate when the laser polarization is rotated. Irradiated under a circularly polarized laser, trapped objects spin spontaneously due to the transfer of angular momentum from the incident photons. The interaction between two gold nanoparticles in a dimer is complex because it involves the optical potential and the DLVO potential. The latter can be probed to some extent using dark-field scattering spectroscopy.

Paper Details

Date Published: 27 August 2010
PDF: 8 pages
Proc. SPIE 7762, Optical Trapping and Optical Micromanipulation VII, 77620O (27 August 2010); doi: 10.1117/12.862740
Show Author Affiliations
Lianming Tong, Chalmers Univ. of Technology (Sweden)
Vladimir D. Miljković, Chalmers Univ. of Technology (Sweden)
Mikael Käll, Chalmers Univ. of Technology (Sweden)

Published in SPIE Proceedings Vol. 7762:
Optical Trapping and Optical Micromanipulation VII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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