Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 53: Photonics II

Q 53.4: Talk

Thursday, March 11, 2010, 14:45–15:00, F 128

Small period surface relief gratings based on azobenzene containing layers for thin film distributed feedback lasers — •Sebastian Döring, Torsten Rabe, Regina Rosenhauer, Olga Kulikovska, Niko Hildebrandt, and Joachim Stumpe — Fraunhofer Institut für Angewandte Polymerforschung, Potsdam, Deutschland

Holographic surface relief gratings written in azobenzene containing films were studied for the use as master structures for polymeric thin film DFB lasers. Light induced mass transport driven by E-Z-isomerisation in azobenzene containing materials have shown to be attractive for one-step fabrication of periodic surface structures with varying parameters for different optical applications. Based on new azobenzene materials and their holographic processing deep surface relief gratings with grating pitches in the range of 400 nm as resonant structures for second order distributed feedback lasers were generated emitting light in the VIS range. Nanoimprint techniques enabled multiple duplications of azobenzene in UV-adhesives. Replicas were coated via spin casting with thin films of red light emitting polymer layers to form distributed feedback thin film lasers. For invesigations of laser behavior multiple surface structures with different corrugation depths of up to 100 nm were generated and duplicated.