Optical Forces in Plasmonic Nanoparticle Dimers
Journal article, 2010

We present calculations of the optical forces between two metal nanospheres forming a hybridized plasmonic chiller. We consider homo- and heterodimers and investigate different plane wave illumination configurations. The forces between the particles are calculated using kill Mie theory combined with the Maxwell stress tensor (MST) formalism, as well as by approximate methods, such as the Lorentz force (LF) approach taken in the dipole limit and calculations based on an optical potential. We show that the simplified calculation schemes can lead to serious errors in the case of strongly interacting particles and low damping. In particular, we find that equilibrium configurations, corresponding to vanishing optical forces, only are possible for homodimers illuminated in the end-fire configuration and for heterodimers, although multipolar effects and clamping radically reduce the repulsive interactions in the latter case.

RADIATION FORCES

TWEEZERS

SILVER ELECTRODE

PYRIDINE

NANOPARTICLES

METAL

DISCRETE-DIPOLE APPROXIMATION

ENHANCED RAMAN-SCATTERING

MOLECULES

PARTICLES

SPECTROSCOPY

Author

Vladimir Miljkovic

Chalmers, Applied Physics, Bionanophotonics

Tavakol Pakizeh

Chalmers, Applied Physics, Bionanophotonics

Borja Sepulveda

Spanish National Research Council (CSIC)

Peter Johansson

Chalmers, Applied Physics, Bionanophotonics

Mikael Käll

Chalmers, Applied Physics, Bionanophotonics

Journal of Physical Chemistry C

1932-7447 (ISSN) 1932-7455 (eISSN)

Vol. 114 16 7472-7479

Subject Categories (SSIF 2011)

Physical Chemistry

DOI

10.1021/jp911371r

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3/9/2025 1