Frankfurt 2006 – scientific programme
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Q: Quantenoptik und Photonik
Q 64: Photonische Kristalle V
Q 64.8: Talk
Thursday, March 16, 2006, 15:45–16:00, HI
Transparent and high refractive index coatings polymerized by UV lithography and/or two-photon polymerization used for photonic applications — •Pélagie Declerck1, Ruth Houbertz1, Carsten Reinhardt2, and Boris Chichkov2 — 1Fraunhofer-Institut für Silicatforschung ISC, Neunerplatz 2, 97082 Würzburg, Germany — 2Lazer Zentrum Hannover LZH, Hollerithallee 8, 30419 Hannover, Germany
High refractive index inorganic-organic hybrid materials were synthesized by hydrolysis/polycondensation reactions of organoalkoxysilanes and titanium or zirconium alkoxide precursors. The organic moieties used for organically functionalizing the inorganic-oxidic units allow one to polymerize the materials directly either by UV lithography or by two-photon polymerization (2PP) processes. Both processes require a photoinitiator which is added to the resins and absorbs in the UV (λo) and the NIR (2λo), respectively. The materials have to absorb in the UV regime, while for the 2PP process, they have to be highly transparent at the laser wavelength (780 to 840 nm). The parameters influencing the refractive index such as kind and amount of organoalkoxysilanes, amount of hetero element alkoxide, concentration of the catalyst, and the curing temperatures for coatings were investigated. The properties of the synthesized hybrid materials and the resulting layers were characterized by spectroscopic and microscopic methods. Besides, experiments on the technological processing of the resins were carried out in order to determine their ability to be patterned by UV light and by 2PP processes, respectively.