Regensburg 2004 – scientific programme

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O: Oberflächenphysik

O 28: Postersitzung (Elektronische Struktur, Grenzfläche fest-flüssig, Halbleiteroberflächen und -grenzflächen, Magnetismus und Symposium SYXM, Methodisches, Nanostrukturen, Oberflächenreaktionen, Teilchen und Cluster, Zeitaufgelöste Spektroskopie)

O 28.36: Poster

Wednesday, March 10, 2004, 16:00–19:00, Bereich C

Imaging of optical near fields of nanostructures with fs laser pulses — •Juliane Birk, Johannes Boneberg, and Paul Leiderer — Universität Konstanz, FB Physik, LS Leiderer, SFB 513, 78457 Konstanz

The optical properties of nanostructures are a topic of interesting investigations. In analogy to the near fields around a Hertz dipole we expect near fields in the surrounding of all nanostructures. Up to now they were analysed with the scanning near field optical microscope (SNOM). We want to introduce an alternative method to image near fields with intensive short laser pulses. The intensity is adjusted to values where the substrate far from the particle is not affected. Nevertheless, the surface around and below the particle can be ablated, due to the local intensity enhancement in the optical near field. After the laser pulse the modified surface is imaged with atomic force microscopy (AFM) and thus the optical near fields of different nanostructures on several substrates, for example silicon, can be studied. A few examples of the near fields of various nanostructures are shown.