Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 4: Plasmonics and Nanooptics I: Light-Matter Interactions

O 4.8: Talk

Monday, March 20, 2017, 12:15–12:30, TRE Ma

Tip modified fluorescence — •Jonas Albert and Markus Lippitz — Experimental Physics III, University of Bayreuth, Germany

In Near Field Microscopy the near field interaction is used to overcome the diffraction limit. We utilise the near-field interaction to modify fluorescence of our samples by the presence of the near-field probe, a metal coated AFM-tip. First experiments on CdSe nanocrystals show significant changes in the fluorescence lifetime dependent on the distance between crystal and a gold-tip.

Furthermore the optical fields at the near-field probe are confined in a space much smaller than the wavelength and therefore showing a high field gradient on the nanometer scale. We are using the optical field gradients to enhance dipole forbidden transitions in coherent excitonic systems, such as wire-like molecular aggregates.