Dresden 2006 – wissenschaftliches Programm
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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 29.8: Poster
Mittwoch, 29. März 2006, 14:30–17:30, P2
Influence of pulsed laser light on gold triangles: Experiment vs. theory — •Juliane König-Birk1, Kevin Shuford2, George Schatz2, Johannes Boneberg1, and Paul Leiderer1 — 1Fachbereich Physik, LS Prof. Dr. Leiderer, Universität Konstanz, 78457 Konstanz — 2Chemistry Department, Northwestern University
The optical properties of nanostructures are a topic of current investigations. In analogy to the near-fields around a Hertz dipole we expect near-fields in the surrounding of all nanostructures. To visualize these near-fields we use a method called No-dqoptical near-field photographyNo-dq. In our experiments we use e.g. silicon as substrate. The nanostructures, in this case gold triangles, on the substrate are illuminated with femtosecond laserpulses. The intensity is adjusted such that no influence of the illumination is detectable on the bare substrate. When illuminating ARRAYS of nanostructures we observe ablation of the substrate below the gold triangles due to the local intensity enhancement in the optical near-field. Depending on the polarization of the laser light, two or one corner of the triangle show ablation holes. In contrast to simulations on single triangles these effects are rotated at 90∘. When illuminating SINGLE nanostructures we observe good agreement with the simulation.