Distributed source model for the full-wave electromagnetic simulation of nonlinear terahertz generation
Date
2012
Authors
Fumeaux, C.
Lin, H.
Serita, K.
Withayachumnankul, W.
Kaufmann, T.
Tonouchi, M.
Abbott, D.
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Type:
Journal article
Citation
Optics Express, 2012; 20(16):18397-18414
Statement of Responsibility
Christophe Fumeaux, Hungyen Lin, Kazunori Serita, Withawat Withayachumnankul, Thomas Kaufmann, Masayoshi Tonouchi, and Derek Abbott
Conference Name
Abstract
The process of terahertz generation through optical rectification in a nonlinear crystal is modeled using discretized equivalent current sources. The equivalent terahertz sources are distributed in the active volume and computed based on a separately modeled near-infrared pump beam. This approach can be used to define an appropriate excitation for full-wave electromagnetic numerical simulations of the generated terahertz radiation. This enables predictive modeling of the near-field interactions of the terahertz beam with micro-structured samples, e.g. in a near-field time-resolved microscopy system. The distributed source model is described in detail, and an implementation in a particular full-wave simulation tool is presented. The numerical results are then validated through a series of measurements on square apertures. The general principle can be applied to other nonlinear processes with possible implementation in any full-wave numerical electromagnetic solver.
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© 2012 OSA