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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...
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