title: Distributed source model for the full-wave electromagnetic simulation of nonlinear terahertz generation.
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.
authors.affiliation: School of Electrical and Electronic Engineering, The University of Adelaide, Adelaide, SA 5005, Australia. cfumeaux@eleceng.adelaide.edu.au
authors.forename: Christophe
authors.initials: C
authors.lastname: Fumeaux
authors.forename: Hungyen
authors.initials: H
authors.lastname: Lin
authors.forename: Kazunori
authors.initials: K
authors.lastname: Serita
authors.forename: Withawat
authors.initials: W
authors.lastname: Withayachumnankul
authors.forename: Thomas
authors.initials: T
authors.lastname: Kaufmann
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Tonouchi
authors.forename: Derek
authors.initials: D
authors.lastname: Abbott