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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.78: Poster

Mittwoch, 16. März 2011, 17:30–21:00, P4

Plasmonic Nanocones — •Dominik Gollmer, Christian Schäfer, Yuliya Fulmes, Andreas Horrer, Dieter Kern, and Monika Fleischer — Universität Tübingen, Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen

Through external electromagnetic excitation, plasmons can be generated in metallic nanostructures. The resulting enhanced electromagnetic near-field can be used for applications, e. g. near-field imaging or surface enhanced Raman spectroscopy (SERS). The plasmon resonance of nanostructures depends on their geometry and composition [1]. We fabricate well-defined metallic nanocones, with tip radii of less than 10 nm [2]. The cones are fabricated using e-beam lithography, defined aluminium oxide masks and Ar ion-milling. The resonance frequency of these cones can be tuned by variation of material or size. The shift of the plasmon frequency when the height of Au cones is varied is shown in dark field spectra. Both an accurate fabrication process and the tunability of the plasmon resonance are fundamental requirements for applications.

[1] H. Kuwata et al. ; Appl. Phys. Lett. 83 (2003); 4625

[2] M. Fleischer at al.; Nanotechnology 21 (2010); 065301