Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 88: Metallic Nanostructures II (on Semiconductors)

O 88.10: Vortrag

Freitag, 29. Februar 2008, 11:45–12:00, MA 005

Design of SERS-active metallo-dielectric nanostructures — •André Siegel, Manuel Rodrigues Gonçalves, and Othmar Marti — Institute of Experimental Physics, Ulm University, Albert-Einstein-Allee 11, D-89069 Ulm, Germany

Since its discovery in the 1970‘s surface enhanced Raman scattering (SERS) has been an active field of research. Its attraction stems from the possibility to detect very tiny concentrations of certain molecules. These high sensitivities are correlated to strong local electric fields, which are usually generated by exploiting the plasmonic properties of metallic nanostructures at optical frequencies. However, many approaches ranging from irregularly shaped nanoparticles, dimers and clusters of nanoparticles to nanoporous metallic films can show very strong SERS spectra, though their reproducibility is mostly not satisfactory.

Therefore we have concentrated on the design and fabrication of periodic metallo-dielectric nanostructures using colloidal crystals as templates, as well as on FEM calculations to predict the associated local field enhancements. The used techniques and our results will be presented.