Arya Fallahi, Efficient Time Doman Simulation of Electromagnetic Problems Using the 3-Dimensional Element Level Time Domain Method
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Europe/Zurich
WBGB 019 (PSI)
WBGB 019
PSI
Benedikt Oswald(GFA)
Description
By the emergence of novel fabrication techniques in nanotechnology, realization of various complex and miniaturized structures became feasible in nanometer scales. The developed technology has also the potential to fulll the desired requirements in the SwissFEL project at PSI. Specically, excitation of surface plasmon polaritons may be helpful for achieving high density electron beams, which are produced by the electron guns designed based on the eld emitter concept. To properly design and optimize the nanostructures for any application, a Maxwell solver is required, which can robustly and eciently model dierent congurations. In this presentation, a recently developed dual-eld, fully explicit Element Level Time Domain (ELTD) method for solving Maxwell's equations on unstructured tetrahedral grids will be presented. First, a brief review of the accomplished tasks for preparing appropriate benchmarks is presented. Then, the main principles of the ELTD method are discussed and its applicability for solving 3-dimensional electromagnetic problems is investigated. This is followed by several examples on the simulation of nano-optical systems using ELTD method. Its generalization for the analysis of dispersive media is described and its use for simulating surface plasmons on gold nano-spheres is examined. The last part of the presentation focuses on ecient procedures for mesh truncation in time-domain simulation using ELTD. An accurate and versatile method based on boundary integrals is introduced, which leads to robust mesh truncation in solving open-region scattering problems. The developed software is going to be used for modeling various structures in nano-optics such as pyramidal emitters in the electron gun and optical micro-lens.
