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Type: Journal article
Title: Distributed source model for the full-wave electromagnetic simulation of nonlinear terahertz generation
Author: Fumeaux, C.
Lin, H.
Serita, K.
Withayachumnankul, W.
Kaufmann, T.
Tonouchi, M.
Abbott, D.
Citation: Optics Express, 2012; 20(16):18397-18414
Publisher: Optical Soc Amer
Issue Date: 2012
ISSN: 1094-4087
Statement of
Christophe Fumeaux, Hungyen Lin, Kazunori Serita, Withawat Withayachumnankul, Thomas Kaufmann, Masayoshi Tonouchi, and Derek Abbott
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.
Keywords: Terahertz imaging
Spectroscopy, terahertz
Near-field microscopy
Rights: © 2012 OSA
DOI: 10.1364/OE.20.018397
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Electrical and Electronic Engineering publications

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