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Plasmonic properties of silver trimers with trigonal symmetry fabricated by electron-beam lithography

Joan Alegret (Institutionen för teknisk fysik, Bionanofotonik) ; Tomas Rindzevicius (Institutionen för teknisk fysik, Bionanofotonik) ; Tavakol Pakizeh (Institutionen för teknisk fysik, Bionanofotonik) ; Yury Alaverdyan (Institutionen för teknisk fysik, Bionanofotonik) ; Linda Gunnarsson (Institutionen för teknisk fysik, Bionanofotonik) ; Mikael Käll (Institutionen för teknisk fysik, Bionanofotonik)
Journal of Physical Chemistry C (1932-7447). Vol. 112 (2008), 37, p. 14313-14317.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: ENHANCED RAMAN-SCATTERING, NANOPARTICLE PAIRS, GOLD NANOPARTICLES, NANOSANDWICHES, PARTICLES, OPTICS, FIELD



Denna post skapades 2009-10-26. Senast ändrad 2016-07-25.
CPL Pubid: 100795

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Bionanofotonik (2007-2015)

Ämnesområden

Teknisk fysik

Chalmers infrastruktur