Plasmonic properties of silver trimers with trigonal symmetry fabricated by electron-beam lithography
Journal article, 2008

We investigate the dipolar plasmon modes of nanoparticle trimers formed by three equal silver disks of diameter D = 100 nm located on the vertexes of an equilateral triangle. Samples were fabricated by electron-beam lithography and studied experimentally by dark-field spectroscopy. The results are found to be in good agreement with electrodynamical simulations based on the discrete dipole approximation (DDA). Similar to nanoparticle dimers, the trimer system exhibits two hybridized dipole resonances to the red and to the blue of the single particle resonance. However, the far-field spectra are polarization-insensitive for light incident normal to the plane of the trimer, and the peak shifts, which occur as the edge-to-edge distance d between the particles decrease, are smaller than for dimers. Moreover, we find that the dipolar displacement patterns are well described by linear combinations of bonding and antibonding symmetry adapted coordinates obtained through symmetry analysis based on the ideal D-3h point-group.

FIELD

NANOSANDWICHES

NANOPARTICLE PAIRS

ENHANCED RAMAN-SCATTERING

PARTICLES

OPTICS

GOLD NANOPARTICLES

Author

Joan Alegret

Chalmers, Applied Physics, Bionanophotonics

Tomas Rindzevicius

Chalmers, Applied Physics, Bionanophotonics

Tavakol Pakizeh

Chalmers, Applied Physics, Bionanophotonics

Yury Alaverdyan

Chalmers, Applied Physics, Bionanophotonics

Linda K Gunnarsson

Chalmers, Applied Physics, Bionanophotonics

Mikael Käll

Chalmers, Applied Physics, Bionanophotonics

Journal of Physical Chemistry C

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

Vol. 112 37 14313-14317

Subject Categories

Other Engineering and Technologies

DOI

10.1021/jp804505k

More information

Created

10/8/2017