Berlin 2008 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 17: Poster: Trends in Ion Beam Technology, Magnetism in Thin Films, Functional Oxides, High-k Dielectric Materials, Semiconductor Nanophotonics, Nanoengineered Thin Films, Layer Deposition Processes, Layer Growth, Layer Properties, Thin Film Characterisation, Metal and Amorphous Layers, Application of Thin Films

DS 17.34: Poster

Dienstag, 26. Februar 2008, 09:30–13:30, Poster A

Subgridding in the FDTD method for simulating the interaction of terahertz radiation with metal — •Andreas Kern, Hanspeter Helm, and Markus Walther — Deptartment of molecular and optical physics, University of Freiburg

Simulating the interaction of electromagnetic terahertz radiation with metals poses difficulties not encountered in the optical regime. Due to a penetration depth small compared to the wavelength, such simulations in the terahertz frequency range require large discretisation volumes with very small grid spacings. To cope with these large scale differences, a novel subgridding scheme was developed that can be used to accurately describe the interaction of long-wavelength radiation with metals while keeping computational costs minimal. Bidirectional coupling between grids allows for the complete integration of refined subdomains into the simulation volume. Implementation in one and two dimensions is demonstrated, and a comparison with theoretical and experimental results is given. Using our technique, we are able to accurately simulate surface-plasmonic effects in terahertz experiments for the first time.