Regensburg 2004 – wissenschaftliches Programm

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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 6: Single Molecules and Molecular Clusters

SYOH 6.1: Hauptvortrag

Freitag, 12. März 2004, 10:15–10:45, H1

Growth control and optics of organic nanoaggregates — •Horst-Günter Rubahn — Fysisk Institut, Syddansk Universitet, DK-5230 Odense M, Danmark

Nanoaggregates and ultrathin films made of organic molecules might become integral parts of new electronic and optoelectronic devices due to their interesting optical properties as well as their chemical and mechanical flexibility. We present a new way to generate by a combination of external control and self assembled growth well ordered, crystalline nanoscaled structures (nanofibers and rings) of highly luminescent organic materials (1). It is shown that microscopic growth control results in low defect densities and thus strongly improved optical properties of these aggregates. Since the nanofibers possess macroscopic lengths but nanoscaled widths and heights they are ideal model systems for investigating limitations and possibilities of optics on the nanoscale. This aspect is exploited in the present talk via a combination of structural and morphological sensitive methods such as low energy electron scattering and atomic force microscopy with optical methods such as epifluorescence microscopy, scanning near field microscopy and two-photon femtosecond resolved spectroscopy. 1: F. Balzer and H.-G.Rubahn, Optics and Photonics News, 14(12), Dec.2003.