Simulation of straight and bent self-written waveguides in photopolymer mixture using phenomenological and diffusion models

Monali Suar; Maik Rahlves; Eduard Reithmeier; Bernhard Roth

doi:10.1117/12.2312507

5 June 2018 Simulation of straight and bent self-written waveguides in photopolymer mixture using phenomenological and diffusion models

Monali Suar, Maik Rahlves, Eduard Reithmeier, Bernhard Roth

Author Affiliations +

Proceedings Volume 10690, Optical Design and Engineering VII; 106900D (2018) https://doi.org/10.1117/12.2312507
Event: SPIE Optical Systems Design, 2018, Frankfurt, Germany

Abstract

Straight and bent self-written waveguides (SWWs) are formed within a photomonomer mixture by means of a self-trapping effect when a single laser beam or two laser beams with tilt are propagated inside. These SWWs can be used as optical interconnects in integrated photonic circuits if two laser beams are launched in opposite directions into the photomonomer. In this work, two kinds of photo-polymerization models are implemented to simulate the SWWs. In the phenomenological model, the refractive index increases directly with actinic laser intensity, whereas the diffusion model has a more complex variation of refractive index profile which takes into account the individual redistribution of mixture components. Both these models are linked with a CrankNicholson based Beam Propagation Method (CN-BPM) to simulate the time varying light distribution within the polymer coupling structures. Differences are observed in the numerical simulation results for straight and bent SWWs with respect to the temporal evolution of refractive index within the mixture, corresponding beam intensity profiles and curing time. In addition, we show that a saturation of refractive index change leads to the polymerization of surrounding monomer and, as consequence, to corrupted light guiding. We report on the minimum refractive index modulation that is required for optimal light guiding within the SWW.

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Monali Suar, Maik Rahlves, Eduard Reithmeier, and Bernhard Roth "Simulation of straight and bent self-written waveguides in photopolymer mixture using phenomenological and diffusion models", Proc. SPIE 10690, Optical Design and Engineering VII, 106900D (5 June 2018); https://doi.org/10.1117/12.2312507

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KEYWORDS

Diffusion

Polymers

Gaussian beams

Waveguides

Beam propagation method

Photorefractive polymers

Optical simulations

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