Dresden 2006 – scientific programme

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O: Oberflächenphysik

O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)

O 29.13: Poster

Wednesday, March 29, 2006, 14:30–17:30, P2

Crescent-shaped noble-metal structures: preparation, optical properties and applications — •Noelia Bocchio, Heiko Rochholz, Jeniffer Shumaker-Parry, Natalie Horn, and Maximilian Kreiter — Max Planck Institut für Polymerforschung, Ackermannweg 10, D-55128, Mainz, Germany

Crescent-shaped metallic nanoparticles in the 60 nm - 400 nm size range were developed applying a combination of nanosphere lithography, metal deposition and ion-milling techniques. They were characterized by scanning electron microscopy and UV-Vis/NIR extinction spectroscopy (1). As expected from the symmetry of the system, the structure exhibits different responses to illumination polarised along the two symmetry axes. For both cases, distinct resonances are observed. A systematic study of the impact of variations of the most relevant geometrical parameters on the optical response is presented.

In the search for an explanation of these experiments and a full understanding of the optical response of the system, a first approach to the resonant responses through a simplified multipole model is presented and discussed.

Finally, single entity scattering and fluorescence measurements on the particles are introduced, laying the basis for applications in near-field enhanced spectroscopy.

(1) Adv. Mater. , 2005, 17, 2131 - 2134