Berlin 2005 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 30: POSTER: Chemical physics

CPP 30.21: Poster

Dienstag, 8. März 2005, 16:30–18:30, Poster TU D

Spectroscopy and Photoswitching of Single Photochromic Nanostructures — •Stephan Rath, Mark Heilig, and Helmut Port — 3. Phys. Inst. Uni Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart

There is increasing interest in possible application of photochromes in thin film technology. By using UHV-vapor deposition methods, specific thin film variants can be fabricated reproducibly: (a) amorphous dots and (b) nano-crystals of adjustable size and distance, respectively, but also (c) extended films with homogeneous coverage. All forms are stable at room temperature. Because of their optical bistability, derivates of fulgides and diarylethenes have been chosen. Films on different substrates have been prepared, optical properties and photochromic performance in the film variants are differentiated. For single nanostructures their fluorescence spectra have been studied with respect to size dependence and structural constraints. On samples with structure distances below the optical diffraction limit, addressing and photo-switching of individual nanostructures between the two isomeric forms is performed by scanning near-field optical microscopy (SNOM).