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O: Fachverband Oberflächenphysik

O 54: Nano-optics of metallic and semiconducting nanostructures (experiments II)

O 54.8: Vortrag

Donnerstag, 26. März 2009, 16:45–17:00, SCH A216

Raman scattering from single gold nanostars — •Calin Hrelescu, Tapan K. Sau, Andrey Rogach, Frank Jäckel, and Jochen Feldmann — Photonics and Optoelectronics Group, Physics Department und CeNS, Ludwig-Maximilians-Universität München, Amalienstraße 54, 80799 München, Germany

We report on surface-enhanced Raman scattering (SERS) from single star-shaped gold nanoparticles coated with self-assembled monolayers of 4-mercaptobenzoic acid. SERS is observed without the formation of gold nanoparticle aggregates or resonant excitation of the analyte. Total Raman scattering enhancement factors for single nanostars are comparable to those of nanoparticle assemblies exhibiting coupled plasmon resonances. This renders gold nanostars promising for Raman imaging applications in complex environments such as cells or membranes.