Optical Forces in Plasmonic Nanoparticle Dimers
Artikel i vetenskaplig tidskrift, 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.

MOLECULES

SPECTROSCOPY

SILVER ELECTRODE

TWEEZERS

NANOPARTICLES

PARTICLES

DISCRETE-DIPOLE APPROXIMATION

ENHANCED RAMAN-SCATTERING

METAL

RADIATION FORCES

PYRIDINE

Författare

Vladimir Miljkovic

Chalmers, Teknisk fysik, Bionanofotonik

Tavakol Pakizeh

Chalmers, Teknisk fysik, Bionanofotonik

Borja Sepulveda

CSIC-ICN Centro de investigacion en nanociencia y nanotecnologia CIN2

Peter Johansson

Chalmers, Teknisk fysik, Bionanofotonik

Mikael Käll

Chalmers, Teknisk fysik, Bionanofotonik

Journal of Physical Chemistry C

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

Vol. 114 7472-7479

Ämneskategorier

Fysikalisk kemi

DOI

10.1021/jp911371r