Regensburg 2010 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster: Colloids and Complex Liquids

CPP 37.13: Poster

Mittwoch, 24. März 2010, 17:30–19:00, Poster B2

Temperature mapping of gold nanostructures — •Marco Braun, Romy Radünz, and Frank Cichos — Molecular Nanophotonics Group, University of Leipzig, Linnéstraße 5, D - 04103 Leipzig

Local temperature control on the micro and nanoscale is of interest in many areas in nanotechnology. Heat generated in gold nanostructures when illuminated at their plasmon frequency is transferred into the surrounding medium, what causes a local temperature field and thus a change of physical properties. This is used e.g. in photothermal microscopy to image metal nano particles with the size of a few nano meter. For an application in engineering or biology this temperature fields must be quantified. As a first approach we present a method for rapid temperature mapping using steady-state fluorescence polarization anisotropy (FPA) of dye molecules in a viscous medium covering the plasmonic structures. Polarization anisotropy scales with rotation correlation time and hence with temperature. FPA is measured in a widefield microscope where the polarizations of the fluorescence light are separated. We demonstrate the temperature mapping with gold nano particles immobilized on a glass substrate forming different structures.