Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 36: Postersitzung (Elektronische Struktur, Grenzfl
äche fest-flüssig, Halbleiteroberfl
ächen und -grenzfl
ächen, Nanostrukturen, Oberfl
ächenreaktionen, Teilchen und Cluster, Struktur und Dynamik reiner Oberfl
ächen)

O 36.34: Poster

Montag, 7. März 2005, 15:00–18:00, Poster TU F

Influence of pulsed laser light on metallic nanostructures — •Daniel Schmidt, Juliane König-Birk, Johannes Boneberg, Elke Scheer, and Paul Leiderer — Department of Physics, University of Konstanz, Germany

We introduce a complementary method to the scanning near-field optical microscopy (SNOM) to image optical near-fields below metallic nanostructures. For this method the socalled No-dqoptical near-field photographyNo-dq we use e.g. silicon, glass or polymer films as substrates. The nanostructures on the substrates are illuminated with a femtosecond laserpulse. The intensity is adjusted such that no influence of the illumination is detectable on the bare substrate. When illuminating arrays of metallic nanostructures on substrates we observe ablation of the substrate below and around the nanostructures due to the local intensity enhancement in the optical near-field. The ablation pattern depends on the geometry of the nanostructures (triangular, rectangular, ...) and the polarization of the laser and can thus be used to image the optical near-field of the nanostructures (1).

In a second experiment we test if the optical near-field can also be used to manipulate the current transport through two tips. For example the electrical conductivity through a mechanically controlled break junction can be manipulated. First results are shown.

(1) Paul Leiderer et al., Appl. Phys. Lett. 85, (2004)