Photo‐fabrication of surface relief gratings on polymer films

Abstract

Surface relief gratings were optically produced on a number of azobenzene‐based polymer films. The surface grating formation was investigated by monitoring the diffraction efficiency and using atomic force microscopy. The effect of the structure of the chromophores on surface modulation was investigated. The surface deformation process depended on the polarization state of the writing beams. The localized variations of the light intensity and alteration of the resulting electric field polarization were essential writing conditions to the formation of the surface relief gratings. The surface pattern from straight edge diffraction established that the surface profile of the recorded gratings is proportional to negative gradient of the intensity pattern incident on the polymer film.

High Contrast Fluorescence Patterning in Cyanostilbene‐Based Crystalline Thin Films: Crystallization‐Induced Mass Flow Via a Photo‐Triggered Phase Transition

“…Photoisomerizable stilbene derivatives, on the other hand, exhibit decent fluorescence emission and may therefore allow for controlling the fluorescence color and intensity through the trans‐cis isomerization . Unfortunately, however, the SRG characteristics of these stilbene compounds are not promising: in spite of their fluorescence characteristics, the surface modulation obtained in stilbene‐containing films is rather insignificant . To overcome the deficiencies of azobenzene and stilbene compounds with respect to the fabrication of fluorescent SRGs, we have been exploring a novel class of molecules that exhibit both SRG formation and strong fluorescence emission to find these features are present in α‐cyanostilbene compounds in this work.…”

Perturbation of Charge-Transfer Complexes in Aqueous Solutions of PEG-DNB by Adding N-Ethylcarbazole and Li+ Cations

“…Polymer charge-transfer complexes (CT) are extensively investigated for both academic and practical reasons. The presence of intramolecular CT interactions in push−pull azo-containing polymers makes them suitable materials for information optical storage − and nonlinear optical properties. , CT interactions are the basis of the electroactive phenomena involved in conductive , and electroluminescent polymers. Composites of conjugated polymers can be used for photovoltaic cells because of the fast photoinduced CT that can be achieved in these materials .…”