Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 24: Plasmonics and Nanooptics: Fabrication, Characterization and Applications
O 24.7: Poster
Montag, 7. März 2016, 18:15–20:30, Poster E
Construction of a tip-enhanced Raman spectroscopy system and gold tip fabrication — •Marcel Weinhold1, Thomas Sander1, Jalmar Tschakert2, Thomas Göddenhenrich2, André Schirmeisen2, Sangam Chatterjee1, and Peter J. Klar1 — 1Justus-Liebig-Universität Gießen, I. Physikalisches Institut, Heinrich-Buff-Ring 16, 35392 Gießen — 2Justus-Liebig-Universität Gießen, Institut für Angewandte Physik, Heinrich-Buff-Ring 16, 35392 Gießen
Raman spectroscopy is a powerful technique for analyzing molecular vibrations as well as lattice dynamics in bulk materials. However, Raman signals are of an weak intensity and the scattering volume probed is rather large, roughly about (500 nm)3. Metallic Scanning Probe Microscope (SPM) tips acting as nanoantennas enhance the signal in a small area (hot-spot) by several orders of magnitude. The phenomenon is known as tip-enhanced Raman spectroscopy (TERS). Due to the fact that reliable tip preparation is still challenging, we fabricated suitable tips by etching a gold wire, sputtering a thin layer of gold on standard Si AFM-tips, and by using an Au e-beam resist. These tips were analyzed with respect to surface roughness, apex radius, and enhancement factor. The latter investigations were carried out on the TERS-system constructed by us and compared with studies on a commercially available one.