Bao, Hualong1; Nielsen, Kristian1; Bang, Ole1; Jepsen, Peter Uhd4
1 Department of Photonics Engineering, Technical University of Denmark2 Fiber Sensors and Supercontinuum Generation, Department of Photonics Engineering, Technical University of Denmark3 Teraherts Technologies and Biophotonics, Department of Photonics Engineering, Technical University of Denmark4 Center for Nanostructured Graphene, Center, Technical University of Denmark
Research on terahertz waveguides is experiencing a tremendous growth due to their importance for compact and robust THz systems. However, designing compact, broadband, mechanically stable and environmentally shielded THz waveguides is still a challenge due to high losses of both metals and dielectrics in this frequency range. Here we report on a novel twist on the classical tube waveguide where we deliberately introduce a thick and highly lossy cladding layer. By this we attenuate the field in the cladding and thus prevent interference with the core field. This mechanism breaks the well-known ARROW guiding mechanism, and as a result, extremely broad bandwidth and low dispersion can be achieved with a very simple design. Since the main part of the field propagates inside the air-core, the propagation loss is still kept at a very low level. Simulations, analytical modelling and experiments verify our findings. The proposed THz waveguide is robust, insensitive to external perturbation and easy to handle, and thus the design represents a significant advance of the field of THz dielectric waveguides suitable for the 0.3-1 THz band which in the future will be important for ultrafast wireless communication systems.
Scientific Reports, 2015, Vol 5
Absorptive cladding; ARROW guiding mechanism; Broadband low-dispersion low loss terahertz guide; Classical dielectric tube waveguide; Field propagation; Ultrafast wireless communication system; Computational Biology; Analytical modeling simulation mathematical and computer techniques; Biomaterials; Models and Simulations