Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 24: Poster Session II

HL 24.9: Poster

Tuesday, March 13, 2018, 18:30–20:30, Poster F

Long-lasting fluorescence enhancement of CdSe-nanowires — •Jonas Albert, Subhasis Adhikari, and Markus Lippitz — Experimentalphysik III, Universität Bayreuth

One dimensional structures like semiconductor or molecular nanowires are interesting systems for optoelectronic devices, because generated charges can be directed along the wire axis.We combine optical microscopy with atomic force microscopy (AFM) to study these structures and how they can be manipulated. By introducing a metallic AFM tip to CdSe nanowires these can show different behavior from photoluminescence quenching to very strong fluorescence enhancement. We want to emphasise on the enhancement effect by the presence of the AFM tip. This enhancement effect can even occur when the tip is micrometers away from the diffraction limited excitation spot. Also a memory effect is present, since the enhanced luminescence decays only on a second timescale when the tip is removed.