Regensburg 2010 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,

DS 29.20: Poster

Mittwoch, 24. März 2010, 15:00–17:30, Poster A

Terahertz Plasmon Dispersion Relation in Layered Semiconductor Structures — •Daniel Dietze, Juraj Darmo, and Karl Unterrainer — TU Wien, Institut für Photonik, 1040 Wien, Österreich

Surface guided waves, so-called plasmons, have attracted considerable attention in the past years due to their possible use for sub-wavelength confinement and guiding of terahertz (THz) electromagnetic fields [1]. Fundamental insight into the behavior of plasmons can be obtained from their dispersion relation, which links the in-plane wave vector β to the angular frequency ω. In general, the underlying equations are transcendental and stability of the numerical methods becomes an issue in the THz spectral range, as the characteristic frequencies are often separated by orders of magnitude.

In our contribution, we present a robust method which does not require any prior knowledge about the dispersion relation or the mode structure. It is based on simplex minimization in three dimensions, a Monte-Carlo approach for the initial values and analytical expressions for the transcendental equations. Additionally, we included the possibility of conducting interfaces, which allows modeling of systems including 2DEG layers, such as HEMTS or graphene based devices. Several examples are presented which are of current technological interest.

[1] J. A. Dionne, L. A. Sweatlock, H. A. Atwater, and A. Polman, Phys. Rev. B 73, 035407 (2006)