Dresden 2011 – scientific programme

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MO: Fachverband Molekülphysik

MO 14: Transport and Spectroscopy in Molecular Nanostructures (related to SYMN, jointly with CPP)

MO 14.8: Talk

Wednesday, March 16, 2011, 16:00–16:15, ZEU 160

Spectral shifts and energy transfer in dye-functionalized nanostructures on silicon substrates — •Thomas Baumgärtel, Harald Graaf, and Christian von Borczyskowski — Center for Nanostructured Materials and Analytics, Institut für Physik, TU Chemnitz, 09107 Chemnitz, Germany

We use local anodic oxidation (LAO) via atomic force microscopy (AFM) to generate silicon oxide nanostructures with a height of a few nanometers and lateral dimensions below 50 nm on alkyl-terminated silicon. These structures can be selectively functionalized by anchoring optically active materials such as dye molecules or semiconductor nanoparticles via a chemical bottom-up approach. This controlled immobilization of fluorophores on a semiconductor surface with a high positioning accuracy in the nanometer regime is a promising step towards the creation of new types of optical nanoscopic devices and model systems. Especially interesting are the optical properties (e.g. spectral emission, excited state lifetime, transition dipole orientation) of the bound emitters which can show a rather large difference compared to a solution or randomly oriented molecules on a surface. These differences will be discussed as a result of the anchoring mechanism, the close proximity of the emitters to the underlying silicon, intermolecular aggregation and alignment and thus an efficient energy transfer.