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. 2015 Oct 6;6:8486. doi: 10.1038/ncomms9486

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(a) HFSS28 simulation of the coupling of the free-space radially polarized mode into the TM₀₁ mode through a dielectric-loaded taper. (b) The time-domain waveform of the THz pulse determined with electro-optic sampling before being coupled into the THz waveguide. (c) The measured versus the modelled time-domain waveform of the THz pulse at the exit of a 5-cm (including tapers) dielectric-loaded THz waveguide.