Regensburg 2019 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 20: Optical Properties

HL 20.3: Talk

Tuesday, April 2, 2019, 14:30–14:45, H31

Nonlinear Optical Properties of Group-IV-Tetraphenyls — •Marius Müller, Florian Dobener, and Sangam Chatterjee — Institute of Experimental Physics I and Center for Materials Research, Heinrich-Buff-Ring 16, Justus-Liebig-University Giessen, D-35392 Giessen, Germany

Tetraphenyl compounds of adamantane-like organic and inorganic clusters show strong nonlinear optical properties. For some habitus, they generate a supercontinuum by infrared cw-laser pumping. However, the underlying mechanism for the nonlinear optical effect is not completely understood. Tentatively, delocalized π-electron systems promote the white light generation. Also, amorphous habitus exhibit supercontinuum generation, while crystalline habitus feature second harmonic generation.

Group-IV-tetraphenyls (Ph₄X) are an alternative group of compounds to examine the influence of the crystallinity on the nonlinear optical properties. These compounds were prepared as single crystals and microcrystalline powders and their nonlinear optical properties are investigated. The compounds are known to show second-harmonic generation, but white-light generation is also observed. We investigated the cause for the change of behavior. The molecules show photo degradation at higher excitation power, which was analyzed using Raman spectroscopy.