Hannover 2020 – scientific programme

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 7: Laser Beam Interaction and Laser Diagnostics

K 7.2: Talk

Wednesday, March 11, 2020, 14:15–14:30, f428

Self-Written Optical Waveguides (SWWs) in Photopolymer Material — •Monali Suar, Axel Guenther, and Bernhard Roth — Hannover Centre for Optical Technologies, Leibniz Universität Hannover, Nienburger Str. 17, 30167 Hanover, Germany

Self-written optical waveguides (SWWs) have received much attention in recent years as light guiding elements in integrated photonic circuits of telecommunication networks. They lend themselves for fast and easy implementation techniques in photopolymer materials and can be realized with very low cost. The physics behind writing these SWW interconnects is influenced by the combined effect of self-focusing and self-trapping of light. An induced change in refractive index is observed as the laser-light propagates through the photopolymer sample leading to the formation of the SWWs. A combined experimental and theoretical study on SWWs was performed and is reported here. The multiphysics modeling and simulation part involved the implementation of a two-dimensional (2D) Crank-Nicholson based beam propagation method which was then coupled to a diffusion material model to obtain the induced change in refractive index. A simple one polymer approach was followed to create SWWs that do not require the removal of residual cladding material in experiment. The transmitted power from the SWWs was recorded during the writing process and then compared to the simulations. We achieved an experimental attenuation below 1 dB/cm for SWWs at a wavelength of 638nm which agree well with our numerical approach. In future, the developed approach will be applied to more complex structures and processes.