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Unified Model for a Nonlinear Pulse Propagation in Composites and Optimization of THz Generation
Anton Husakou, Olga Fedotova, Ryhor Rusetsky, Oleg Khasanov, Tatsiana Smirnova, Alexander Fedotov, Tzveta Apostolova, Ihar Babushkin, Usman Sapaev
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We describe a unified numerical model which allows fast and accurate simulation of nonlinear light propagation in nanoparticle composites, including various effects such as group velocity dispersion, second- and third-order nonlinearity, quasi-free-carrier formation and plasma contribution, exciton dynamics, scattering and so on. The developed software package SOLPIC is made available for the community. Using this model, we analyze and optimize efficient generation of THz radiation by two-color pulses in ZnO/fused silica composite, predicting an efficiency of 3\%. We compare the role of various nonlinear effects contributing to the frequency conversion, and show that optimum conditions of THz generation differ from those expected intuitively.
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