An Eigenmode Study of Tunable THz Nanoantenas

The current work focuses on the study of tunable THz open structures, establishing an eigenmode analysis based on an in-house developed finite element code. The key feature of this numerical tool is the modification of eigenanalysis formulation for the study of microwave structures, in order to meet the requirements for the study of devices operating at THz regime. The eigenmodes of tunable THz nanoantennas will be studied to reveal their characteristics and devise a design approach. For the truncation of the open-unbounded domain, the first order absorbing boundary conditions will be employed, while the occurring spurious modes will be eliminated with the incorporation of a tree-cotree technique. The tunability of the studied structures will be evaluated in a rather innovative approach as a piecewise constant distribution for the electro-optically controlled dielectric constant.