Physik: DPG Tagungen - Sitzung O 28 - Nano-science.de

Physik: DPG Tagungen - Sitzung O 28
http://www.dpg-tagungen.de/archive/2004/o_28.html
O 28.49 Poster Mi 16:00 Bereich C
Generation of metal nanodroplets and experiments on their velocity and landing
•Anja Habenicht, Michael Olapinski, Johannes Boneberg und Paul Leiderer
Universität Konstanz, FB Physik SFB 513, 78457 Konstanz
An interesting observation can be made when gold nanostructures placed on a substrate are illuminated with an
intensive short laser pulse: Just above the melting threshold all particles leave the surface. The reason for this
effect is the wetting behaviour: Gold does not wet the glass substrate, thus the liquid nanostructures can reduce
their surface energy by reforming to spheres. If this transformation is sufficiently fast the liquid spheres take
off from the surface. The velocity of the flying nanodroplets can be determined by analyzing the time dependent
scattering signal which arises when the droplets cross a sheet of light. This signal can be converted into a
velocity dependent particle density. The particles cool down during the flight due to thermal radiation. By
catching the nanodroplets on a further substrate at different distances, the droplets can be landed either in liquid
or in solid state. First results of velocity measurements and the impact experiments are shown.
O 28.50 Poster Mi 16:00 Bereich C
Nanostructuring using colloid crystals and dry and wet etching techniques
•Manuel Gonçalves 1 , Moritz Trautvetter 2 , Oliver Dubbers 2 , Sebastian Fricker 2 , Alfred Plettl 2 , Paul Ziemann 2
und Othmar Marti 1
1 Department of Experimental Physics, University of Ulm, D-89069 Ulm, Germany
2 Department of Solid State Physics, University of Ulm, D-89069 Ulm, Germany
Sub-wavelength structures produced using latex colloidal crystals have been intensively investigated in the last
years, namely to produce photonic crystals. One of most known techniques to produce nanoparticles using
monolayers of latex spheres as lithographic masks, has been developed by U. Ch. Fischer et al. in 1981 (Fischer
projection patterns or FPP). This method, however, is restricted to few possible particle shapes.
We have developed two techniques to extend the number the possible shapes and geometrical configurations,
using colloidal crystals and FPPs combined with dry and wet etching techniques.
Inverse projection pattens have been produced using the common FPPs combined with wet chemical etching.
We have also developed a technique to produce sub-wavelength structures using monolayers of latex spheres
etched by a plasma. The size and the separation of the particles can be controlled by the etching level and by
selecting the size of the latex spheres.
Several nanostructures using these techniques have been produced and characterized by scanning probe
microscopy and scanning electron microscopy. The optical properties of some samples produced using metallic
thin films are also presented.
O 28.51 Poster Mi 16:00 Bereich C
Application of imaging XPS for chemical analysis and mapping of magnetic domains
•S. Schmidt 1 , M. Escher 2 , F. Forster 1 , D. Funnemann 3 , B. Krömker 3 , M. Merkel 2 , F. Reinert 1 und N. Weber 2
2 Focus GmbH
3 Omicron Nanotechnology GmbH
1 Universität des Saarlandes, FR 7.2 Experimentalphysik, Postfach 151150, 66041 Saarbrücken
We present first scientific applications of a new NanoESCA [1] spectrometer: we have used the good spatial
resolution to investigate the chemical structure of plain and decorated grain boundaries in two reference
materials Al 0.98 Sn 0.02 and Cu 0.98 Bi 0.02 [2]. The data measured at the high-intensity small-spot beamlines of
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