Three-dimensional extended nonlocal photopolymerization driven diffusion model. Part II. Photopolymerization and model development

摘要

In Part I of this paper [J. Opt. Soc. Am. B 31, 2638 (2014)], an absorption model is used to predict the dye concentration and light intensity distribution inside a photopolymer medium volume. These results are now used as inputs to a Runge-Kutta algorithm acting as a subgrid of the finite-difference time-domain (FDTD) method. In this way, a full 3D time-dependent nonlocal photopolymerization driven diffusion model is implemented. This enables a more accurate and physical description of the evolutions of the holographic grating. The validity of the proposed model is examined by applying it to fit experimental data for acrylamide/polyvinyl alcohol photopolymer material layers containing the photosensitizer erythrosine B. Material parameter values are estimated by numerically fitting the experimentally obtained refractive index modulation growth curves and angular scans. (C) 2014 Optical Society of America