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

本项目的主要目的是从理论和实验上研究超表面/Goubau线和超表面/线对混合系统中强约束太赫兹表面等离子体激元的电磁特性。特别地，我们将研究超材料表面与Goubau线或线对之间界面处的太赫兹表面等离子体激元的时空和空间光谱耦合和传播特性。本项目的另一部分涉及Goubau线、线对和超材料表面上的太赫兹表面等离子体激元的空间光谱行为的主动、动态操纵。Goubau线和线对将嵌入半导体材料中，使得分别由金属表面/半导体和Goubau线/半导体或线对/半导体化合物组成的混合系统的电磁特性可以通过电子或光学刺激来调谐和调制。为了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。建立了一个用于强太赫兹电场的成像太赫兹近场光谱仪，可以对表面等离子体激元的时空和空间光谱行为进行实验研究。

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.