Polarization Dependent Photoinduced Supramolecular Chirality in High-Performance Azo Materials

Molecules

Sekvan Bagatur¹  Marcel Schlesag¹  Thomas Fuhrmann-Lieker¹ 

[1] Physical Chemistry of Nanomaterials, Institute of Chemistry and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, 34132 Kassel, Germany;

关键词: azo materials;    supramolecular chirality;    polarimetry;    azo polymers;    polarization lithographie;    polarimetry;   

DOI  :  10.3390/molecules26102842

来源: DOAJ

【 摘 要 】

Here, we will show photo-induced supramolecular chirality in thin films of achiral amorphous polymers with azo groups in their side-chain. A matter of particular interest is the effect of various film thicknesses on azimuthal rotation and ellipticity of incident/transmitted polarized light. Furthermore, we investigated the temporal stability of inscribed chirality. By polarimetric measurements, we found out that the azimuthal rotation gets higher with layer thickness. In this scope, we were able to measure a very high azimuthal rotation of $\Delta \psi /d={112.5}^{\circ }$/μm. The inscribed chirality was stable for several days. Furthermore, we investigated the time-resolved behavior of incident and transmitted polarization ellipticities for various thicknesses. The time dependency may be explained by a two-step process: (1) fast trans-cis-isomerization resulting in photo-orientation and (2) slow photo-induced mass flow.

【 授权许可】

Unknown