The rich photophysics of azobenzene-functionalized molecular glasses and polymers makes them a fascinating material class with a large scope of applications. When exposed to UV or blue light, the covalently attached azobenzene moieties perform repeated trans-cis-trans isomerization cycles. Depending on the polarization of the light and the molecular structure of the functionalized compounds, the azobenzene chromophores can either reorient at a fixed location or, in addition, migrate over macroscopic distances. Molecular orientation is useful for the storage of holographic volume gratings since it causes the refractive index to become anisotropic. To observe migration, the material must become photofluidic. This state is a peculiarity of azobenzene-functionalized glass formers and denotes their capability to flow like a viscous liquid without raising their macroscopic temperature when exposed to light. By means of external forces, such as optical gradients or adhesive forces, shaping of the material surface is possible. As a consequence, azobenzene-functionalized molecular glasses and polymers are suitable for different fields of application, which are discussed in this thesis. They comprise the holographic storage of data, the lithographic manufacturing of micrometer- and nanometer-sized structures, and the optical generation of surface relief patterns. In addition, a new method for the determination of refractive indices is presented and characterized.
|School:||Universitaet Bayreuth (Germany)|
|Source:||DAI-C 81/4(E), Dissertation Abstracts International|
|Subjects:||Materials science, Applied physics|
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