Dielectric tube waveguides with absorptive cladding for broadband, low-dispersion and low loss THz guiding

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Abstract

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.
Original languageEnglish
JournalScientific Reports
Volume5
Number of pages9
ISSN2045-2322
DOIs
Publication statusPublished - 2015

Keywords

  • 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

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