Berlin 2005 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 29: POSTER: Polymer physics
CPP 29.10: Poster
Tuesday, March 8, 2005, 16:30–18:30, Poster TU D
Investigation of Thermal Treated Surface Relief Gratings by Means of Atomic Force Microscopy and Diffraction Measurements — •Stefan Katholy1, Knut Morawetz1, Burkard Stiller2, and Ullrich Pietsch1 — 1Universität Potsdam, Institut für Physik, STAN, Am Neuen Palais 10. 14469 Potsdam — 2Universität Potsdam, Institut für Physik, PWM, Am Neuen Palais 10. 14469 Potsdam
Thin Spin Coating films of polymers with photochromic azobenzene side chains are of great interest for optical data storage systems. These gratings are prepared under ambient conditions by illumination of the films with actinic light (488nm). The E/Z isometrization of the azochomophoric groups causes a remarkable mass transport of film material, leading to a periodic change of the film thickness, the so called surface relief grating (SRG) [1,2]. The E/Z isomerization changes also the optical properties of the material, i.e. the refractive index [2]. For special applications it is of prior interest to generate a periodic lateral variation of the optical properties. The aim of this work was to find optimal preparation conditions for films, which have a periodic variation of refractive index, but with a smooth surface (so called density gratings). These films are prepared by thermal annealing of SRG gratings. The quality of the obtained density gratings depends on the properties of the polymer, the inscription conditions of the SRG grating and the subsequent annealing process.
[1] J. Barrett, L. Rochon, A. Natansohn, J. Chem. Phys., 109 (1998), p.1505 [2] U. Pietsch Phys. Rev. B 66 (2002), pp.155430-1