Regensburg 2010 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 30: Plasmonics and Nanophotonics II (Joint Session with O/DS)
HL 30.6: Vortrag
Dienstag, 23. März 2010, 16:15–16:30, H2
Enhanced Raman scattering at nanoparticles and gratings with nanoparticles — •Manuel Gonçalves and Othmar Marti — Universität Ulm - Inst. für Experimentelle Physik, Albert-Einstein-Allee 11, 89081 Ulm, Deutschland
Silver and gold nanoparticles of triangular shape in periodic arrays are appropriate templates for molecular detection by means of surface enhanced Raman scattering (SERS). The near-field enhancements may reach 100 and the corresponding Raman electromagnetic enhancements are of the order of 108. On the other hand, surface plasmon modes supported in gratings contribute as well to near-field enhancements, and allow an easy excitation of the long-range surface plasmons in the grating.
We show how plasmonic systems built of gratings and nanoparticles can be of interest for SERS, and how strong near-fields may be achieved. SERS measurements done with a confocal Raman microscope permit to study the dependence of near-field intensity on the shape of the particle and on the excitation conditions.
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