Terahertz metamaterials : From fundamental coupling mechanisms to new terahertz metasurfaces and functional emitters

Hochschulschrift

Zusammenfassung: The central topic of this thesis is the investigation of a new kind of optical materials, so called metamaterials. These artificially created materials consist of periodically arranged sub-wavelength sized resonant structures. Their optical properties can be designed by changing the form, size or arrangement of the sub-structures. The resonator's interaction among each other and with an incident light-field is investigated experimentally in the terahertz regime of the electromagnetic spectrum. In the first part of this thesis the fundamental electromagnetic interaction between one type of sub-structure, a single Split-Ring resonator, is investigated in two dimensional arrays.Then the complexity of interaction was increased by adding a second Split-Ring inside each unit cell, which results in the formation of a particular kind of resonance, a so called Fano resonance. The line-shape of this sharp asymmetrically shaped resonance was then controlled by the separation between the two resonators.In the third part a new type of optical materials is presented, a wave vector selective surface. This ultra thin structured surface can filter out waves, which arrive under oblique incident on the surface, operating effectively as a tunnel vision filter. In the last part a novel method is presented to excite resonant structures on semiconductor substrates using visible light. As one example this technique is than used as an inverse near-field microscope, to map the electromagnetic near-fields of those resonators with sub-wavelength resolution

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch
• Notes: Albert-Ludwigs-Universität Freiburg, Dissertation, 2015

Classification and Topics

• Classification: Physik
• Keyword: Terahertzbereich ; FIR-Spektroskopie ; Metamaterial ; FIR-Mikroskopie ; Nahfeldoptik

Contributors, Places and Time

• Event: Veröffentlichung
• (where): Freiburg
• (who): Universität
• (when): 2015
• Creator: Wallauer, Jan
• Contributor: Walther, Markus

Further information

• DOI: 10.6094/UNIFR/10294
• URN: urn:nbn:de:bsz:25-freidok-102949
• Rights: Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 25.03.2025, 1:50 PM CET