Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 26: Plasmonics and nanooptics II
O 26.5: Talk
Tuesday, March 27, 2012, 11:30–11:45, MA 005
Fabrication of highly ordered nanostructures by controlling the local near fields of gold nanoparticles — •Frank Hubenthal1, Sören Maag1, Abdul Jamali2, Bernd Witzigmann2, Thomas Baumert3, and Frank Träger1 — 1Experimental Physics I, Clusters and Nanostructures, Institute of Physics and CINSaT, University of Kassel — 2Computational Electronics and Photonics and CINSaT, University of Kassel — 3Experimental Physics III, Femtosecond Spectroscopy and Ultrafast Laser Control, Institute of Physics and CINSaT, University of Kassel
Generation of highly ordered nanostructures with dimensions well below the diffraction limit in a parallel process is a great challenge in modern nanotechnology. One possibility to achieve this goal is irradiation of spherical or triangular gold nanoparticles with laser light and exploit the local near fields, which are strongly influenced by the excitation of surface plasmons. In our experiments spherical and triangular gold nanoparticles supported on fused silica were irradiated with laser light with a pulse duration of 35 fs and a central wavelength of 790 nm. The irradiation causes a strongly localized ablation of the fused silica surface and nanostructures with dimensions well below the diffraction limit are generated. Finally, we present first studies applying two pulses with different polarisation directions, with the aim to generate complex but predetermined nanostructures. In addition, varying the time delay between the two pulses permits to estimate the nanoparticle ablation time, by investigating the generated structures as a function of time delay.