Berlin 2005 – scientific programme
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DS: Dünne Schichten
DS 14: Schichtherstellung mit Laserverfahren
DS 14.6: Talk
Monday, March 7, 2005, 16:30–16:45, TU HS107
More-dimensional surface-relief gratings in thin films of organic glasses — •Sven Verpoort1, Ansgar Draude1, Hilmar Franke1, Thomas Fuhrmann2, and Roger A Lessard3 — 1Universität Duisburg-Essen, Abteilung Duisburg, Laboratorium für angewandte Physik, Lotharstr. 1, 47048 Duisburg — 2Makromolekulare Chemie und molekulare Materialien, Universität Kassel, Heinrich-Plett Str. 40, 34109 Kassel — 3COPL, departement de physique, university Laval, G1K7P4, Quebec, Canada
The formation of holographic gratings in thin films of azo-glasses with thicknesses d ≤ 10−6 m is investigated for the case of more-dimensional light-intensity patterns. The mechanism of the photo-isomerisation of the azo-compounds is used to form dual gratings with a refractive index grating and a surface-relief grating.
The diffraction efficiency as a function of the recording time in case of holographic 1D-gratings is discussed in a model of 2 consecutive processes with a phase shift. A material transport process is involved in the formation of relief patterns.
2D-gratings are formed using a 3-beam holographic set-up. The resulting light-patterns are simulated and AFM-measurements are used to confirm the simulated patterns. The modulation of the surface-relief gratings can be enhanced by the application of a Corona-discharge after the holographic recording.
Grating-coupling experiments were performed with the use of 2D surface-relief gratings in order to enhance the irradiation-characteristics of multi-layer systems.