Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 63: Posters: Scanning Probe Methods

O 63.13: Poster

Mittwoch, 2. April 2014, 17:30–21:00, P2

Fabrication of gold nanocone near-field scanning optical microscopy probes — •Omar Tanirah, Dieter P. Kern, and Monika Fleischer — Institute for Applied Physics, Eberhard Karls University Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany

Near-field scanning optical microscopy (NSOM) is an excellent method in its ability to probe the morphology of samples at the same time as their local optical properties, and can be integrated with tip-enhanced Raman spectroscopy. Hence, simultaneous investigatons of the morphology, physical and chemical properties on the nanometer scale can be obtained. The NSOM probe has an important role in enhancing the performance of the NSOM measurements. One such approach is the fabrication of probes based on plasmonic nanostructures. They exhibit localized surface plasmon resonances, and enable a resolution far beyond the diffraction limit. Gold nanocones are interesting plasmonic nanostructures for this purpose, since the near-field of the plasmons is strongly localized around the nanocone tip of radius smaller than 10 nm. We report here the fabrication process of gold nanocones as novel NSOM probes on both cantilevers and optical fibres [1, 2]. The fabrication process is achieved by wet etching, focused gallium ion beam, sputtering, electron beam evaporation, and electron beam induced deposition. Finally, a gold nanocone is formed after etching the samples in an argon-ion milling machine. The samples are characterized using scanning electron microscopy. The fabrication process and resulting probes will be shown. [1] M. Fleischer, Nanotechnol. Rev.1 (2012) 313. [2] M. Fleischer et al., ACS Nano 5 (2011) 2570.