Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 46: Plasmonics and Nanooptics I
O 46.9: Vortrag
Mittwoch, 2. April 2014, 12:30–12:45, TRE Phy
Distinction between horizontal and vertical plasmonic modes in 3D nanostructures — •Monika Fleischer1, Julia Fulmes1, Christian Schäfer1, Dieter Kern1, Mikael Renault2, Anne-Laure Baudrion2, and Pierre-Michel Adam2 — 1Eberhard Karls University Tübingen, 72076 Tübingen, Germany — 2University of Technology Troyes, 10000 Troyes, France
The dark-field scattering or extinction spectra of plasmonic nanostructures, such as e.g. nanorods, exhibit distinct peaks that indicate the resonances of the localized surface plasmon polaritons excited in the structures [1]. For three-dimensional nanostructures, vertical modes may occur as well. These are however rarely reported due to the predominant excitation and detection of in-plane modes. Here gold nanocone antennas with different aspect ratios are fabricated by two strategies using top-down lithography [2,3], and their plasmon resonance spectra in the far-field are analyzed by single-particle dark field scattering spectroscopy [4,5], variable angle UV-vis extinction spectroscopy, and total internal reflection spectroscopy. The study shows that both in-plane and out-of-plane modes of the 3D nanostructures can be excited, and that their relative spectral positions can be individually engineered via the nanocone geometry [3]. The experiments are compared with simulations for the same geometries.
[1] W. Gotschy et al., Opt. Lett. 21, 1099 (1996); [2] M. Fleischer et al., Nanotechnol. 21, 065301 (2010); [3] J. Fulmes et al., in preparation (2013); [4] C. Sönnichsen et al., New J. Of Physics 4, 93 (2002); [5] C. Schäfer et al., Nanoscale 5, 7861 (2013).