Azo-azulene based compounds-nonlinear optical and photorefractive properties

This work reports on nonlinear optical properties of some azo-functionalized azulene derivatives. Linear and nonlinear optical absorption, second- and third harmonic generation were used as diagnostic tools. It was demonstrated that light induced a surface pattern on thin films containing the studied compounds. The results indicate an important role of thiazole substitution for enhancing NLO properties of the azulene derivatives.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (65 K)Download as PowerPoint slideHighlights► Azo-aulene derivative composites with PMMA. ► Optical linear and nonlinear properties were studied. ► Surface relief grating were recorded on azo-azulene containing thin films. ►Prolonged illumination influenced the form of the recorded pattern. ► Initially visible parallel grooves were converted in a honeycomb-like structure.