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(a) THz-TDS experimental setup with a parallel-plate waveguide in the beamwaist. Si lenses couple the free-space radiation into the gap between the plates. (b) Metal flare assembly. When placed in the THz-TDS system, the smoothly curved metal flare guides the THz beam through the gap. Efficient input and output coupling are achieved.
Measured amplitude transmission for a copper flare of variable full opening. An optimal opening occurs where the coupling ratio is the maximum. The longer and thereby smoother 12 cm flare has the higher coupling ratio. Inset: zoom on the geometry and the nomenclature of the flare.
Amplitude transmission of broadband THz radiation measured for different flare openings (solid line: 12 cm flare and dashed: 8 cm flare). All flares show only a negligible spectral dependency of coupling which is desired for spectroscopic applications.
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