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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 60.62: Poster
Wednesday, March 16, 2011, 17:30–21:00, P4
Optical properties of gold nanorings prepared by different lithography methods — •Yuliya Fulmes1, Kai Braun2, Christian Schäfer1, Andreas Horrer1, Dominik Gollmer1, Dai Zhang2, Alfred Meixner2, Dieter Kern1, and Monika Fleischer1 — 1Institute of Applied Physics, University of Tuebingen, 72076 Tuebingen, Germany — 2Institute of Physical and Theoretical Chemistry, University of Tuebingen, 72076 Tuebingen
Gold nanorings feature a variety of optical phenomena and exhibit a size- and shape-dependent resonance wavelength tuneable over a wide range in the visible and near-infrared spectrum. Different approaches have been pursued for the preparation of gold nanorings. In the first one, the individual rings are fabricated from a thin gold layer by HSQ e-beam lithography followed by angular argon ion milling. In the second one, Au rings are produced using colloidal lithography. A gold film is evaporated onto polystyrene particle coated substrates. During argon ion milling secondary sputtering of material creates a gold shell around the sides of the particles, which are removed afterwards. In the third approach, the patterns are defined in PMMA by e-beam lithography. Gold rings are obtained after a standard lift-off process of a gold layer which was deposited after development of PMMA. Using the above-mentioned methods it is possible to structure gold nanorings of many desirable sizes and geometries. The optical properties of the structures under excitation with an electromagnetic field are simulated by means of finite element methods and investigated in a parabolic mirror confocal microscope.