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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.29: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Optical Properties of Plasmonic Planar Septamer Nanostructures — •Mario Hentschel1,2, Na Liu1, and Harald Giessen1 — 14. Physikalisches Institut, Universität Stuttgart — 2Max-Planck-Institut für Festkörperforschung, Stuttgart
Planar septamer nanostructures are supposed to show interesting coupling effects. Mirin et al. [1] predicted a plethora of symmetry-dependent spectral features. For instance, the symmetric mode takes in-phase oscillations of all particle plasmons into account, whereas the antisymmetric mode allows for phase shifts of pi.
We fabricated a variety of septamer structures by high-resolution electron beam lithography and varied coupling as well as symmetry parameters. Coupling distances as small as 12 nm have been achieved.
We are going to discuss the optical spectra as a function of structure sizes, geometry, and neighbor-neighbor distance and find interesting coupling effects. A simple dipole-dipole coupling picture between the electric dipole moment of particle plasmons can be utilized to visualize the energy levels as well as the oscillator strength of the optical spectra.
[1] Nikolay A. Mirin et al., J. Phys. Chem. A 113, 4028-4034 (2009)