Plasmonic properties of silver trimers with trigonal symmetry fabricated by electron-beam lithography
Artikel i vetenskaplig tidskrift, 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

Författare

Joan Alegret

Chalmers, Teknisk fysik, Bionanofotonik

Tomas Rindzevicius

Chalmers, Teknisk fysik, Bionanofotonik

Tavakol Pakizeh

Chalmers, Teknisk fysik, Bionanofotonik

Yury Alaverdyan

Chalmers, Teknisk fysik, Bionanofotonik

Linda K Gunnarsson

Chalmers, Teknisk fysik, Bionanofotonik

Mikael Käll

Chalmers, Teknisk fysik, Bionanofotonik

Journal of Physical Chemistry C

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

Vol. 112 14313-14317

Ämneskategorier

Annan teknik

DOI

10.1021/jp804505k