Bias-free and compact mode-matched excitation of THz coaxial waveguides

Miguel Navarro-Cia, Jiang Wu, Huiyun Liu, Oleg Mitrofanov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


The large mode mismatch between free-space linearly-polarized beams and radially-polarized modes supported in coaxial waveguides leads to a very poor coupling efficiency that have hindered the widespread use of THz coaxial
waveguides. We show here a straightforward coupling mechanism that promises 100% efficiency. We exploit the THz pulse generation process from photoexcited charge density gradients to create a radially-polarized THz pulse with the profile matching the fundamental mode profile of the coaxial waveguide. Single mode propagation is demonstrated at the output of the coaxial waveguide
Original languageEnglish
Title of host publication41st International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2016
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages2
ISBN (Print)978‐1‐4673‐8485‐8
Publication statusPublished - Oct 2016


  • Terahertz
  • Photocurrent
  • Semiconductor
  • coaxial transmission lines
  • Near-field time-domain microscopy


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