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We present efficient coupling of focused broadband terahertz radiation into tapered metal parallel plate waveguides of sub-wavelength gap widths. The achieved amplitude coupling ratio of more than 70 % is investigated for different polarizations.
We report on the coupling process of broadband terahertz radiation into metal parallel-plate waveguides with sub-wavelength gaps. Starting from well known quasi-optic coupling using silicon lenses, we developed a coupling scheme based on adiabatic coupling using metal flares. The metal surfaces change their shape slowly and smoothly with respect to the wavelength of terahertz radiation (300 μm). The...
We report on the microwave approach of coupling terahertz radiation into metal parallel-plate waveguides. The coupling ratio is compared to the quasi-optic coupling using silicon lenses. High resolution terahertz spectroscopy of micro-crystalline films is presented.
Terahertz time-domain spectroscopy accesses the frequency range between 100 GHz and 5 THz by using the coherent generation and detection based on femtosecond laser sources. On the way to obtain fingerprint absorption spectra of molecular solids, terahertz waveguides have proven to be a valuable tool to extend the results to narrow and high resolution linewidths of crystalline solids. We will discuss...
Terahertz surface waves propagating on dielectric coated metal sheets are investigated. With respect to sensor applications the interaction of the guided THz wave and closely approaching coated metallic cylinders is discussed. Unexpected coupling efficiencies are obtained.
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