Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session 2
CPP 37.4: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P3
Photorefractive Effect in Azobenzene-Containing Materials — •Christoph Meichner1, Lothar Kador1, Christian Probst2, Robin Pettau2, and Hans-Werner Schmidt2 — 1University of Bayreuth, Institute of Physics and Bayreuther Institut für Makromolekülforschung (BIMF), 95440 Bayreuth, Germany — 2University of Bayreuth, Macromolecular Chemistry I and Bayreuther Institut für Makromolekülforschung (BIMF), 95440 Bayreuth, Germany
Azobenzene-based materials are usually used for holographic applications. Recent measurements reveal that they also exhibit a photorefractive effect. It manifests itself in intensity variations of the two transmitted laser beams (488 nm) which are used for hologram inscription (so-called asymmetric two-beam coupling). This effect has its origin in a phase shift between the holographic light intensity grating and the refractive-index grating in the material. The difference to most two-beam coupling experiments in other materials is that the effect arises here without any external electical field applied. The measurements show that the phase difference is dynamical and varies with time.