Dynamic manipulation of strongly confined terahertz surface waves on meta-surfaces, Goubau lines and wire pairs

本项目旨在从理论和实验上研究强受限等离子体表面太赫兹表面等离子体激元在准表面/勾包线和准表面/线对混合系统中的电磁性质。特别是，我们将研究太赫兹表面等离子体在亚表面与狗堡线或线对界面上的时空和光谱耦合和传播特性。该项目的另一部分涉及对太赫兹表面等离子体极化子在狗堡线、线对和亚表面上的空间光谱行为的主动、动态操纵。为此，将亚表面、狗堡线和线对嵌入到半导体材料中，以使分别由亚表面/半导体和狗堡线/半导体或线对/半导体或线对/半导体组成的混合系统的电磁特性能够被电子或光刺激所调谐和调制。为了实验研究表面等离子体激元在无源和有源系统中的电磁行为，需要产生高功率的太赫兹辐射以获得足够的信噪比。为此，我们将建立一台太赫兹近场成像光谱仪，用于实验研究表面等离子体激元的时空和空间光谱行为。

The project aims at the theoretical and experimental investigation ofthe electromagnetic properties of strongly confined plasmonicterahertz surface plasmon polaritons in hybrid metasurface/Goubau line and metasurface/wire-pair systems. In particular, the spatio-temporal and spatio-spectralcoupling and propagation properties of terahertz surface plasmons atthe interface between metasurfaces and Goubau lines or wire pairs will be studied.A further part of the project is concerned with the active, dynamicmanipulation of the spatio-spectral behavior of terahertz surfaceplasmon polartons on Goubau lines, wire pairs and the metasurfaces.For this purpose, the metasurfaces, Goubau lines and wire pairs will beembedded in semiconductor materials, such that the electromagneticproperties of the hybrid system, consisting of themetasurface/semiconductor and Goubau line/semiconductor or wire pair/semiconductorcompounds, respectively, can be tuned and modulated by electronicor optical stimuli. For the experimental investigation of theelectromagnetic behavior of surface plasmon polaritons in both, thepassive and the active systems, it is necessary to generate highpower terahertz radiation to achieve a sufficient signal-to-noise ratio.For this reason, an imaging terahertz near-field spectroscope forstrong terahertz electric fields will be set up that allows theexperimental study of the spatio-temporal and spatio-spectralbehavior of the surface plasmon polaritons.