Dresden 2006 – wissenschaftliches Programm
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DF: Dielektrische Festkörper
DF 10: Electric, Electromechanical and Optical Properties I
DF 10.4: Vortrag
Donnerstag, 30. März 2006, 15:50–16:10, M{\"U}L Elch
Photorefraction as a general property of light-induced metastable states in nitrosyl compounds — •Dominik Schaniel1, Thomas Weisemoeller1, Mirco Imlau1, Theo Woike2, Karl Krämer3, and Hans-Ueli Güdel3 — 1Fachbereich Physik, Universität Osnabrück, Barbarstrasse 7, 49069 Osnabrück — 2Institut für Mineralogie, Universität zu Köln, Zülpicherstrasse 49b, 50674 Köln — 3Department of Chemistry and Biochemsitry, University of Bern, Freiestrasse 3, 3000 Bern 9
Photorefractive materials have a broad range of applications in the field of nonlinear optics and need often to be tailored to meet specific demands. In oxidic electro-optic materials or photorefractive polymers tuning is achieved by additional doping of charge carriers or application of external fields. We report on another class of photosensitive compounds containing molecules of type [ML5NO]n± with M a transition metal, L a broad range of ligands, and n the formal charge of the anion/cation. In these compounds metastable states can be generated by light irradiation and tuning of the photorefractive response is achieved by selecting different molecules [ML5NO]n±, e.g., the lifetime and spectral sensitivity of the metastable states can be varied from 10−8s to101s and from 300-1200 nm, while the size of the effect can be adjusted up to Δ n ∼ 10−2. We show that photorefraction is a general property of the light-induced metastable states accessible in molecules of the type [ML5NO]n± and thereby establish a new class of photorefractive compounds.