Abstract
The excitation and propagation of surface electromagnetic waves (SEW) is studied in the terahertz (THz) frequency range. Within these frequencies a surface plasmon propagating on metal surfaces experiences low losses due to high permittivities compared to shorter wavelength. Free space radiation was coupled to a narrowband SEW by diffraction gratings covered with a gold film. The coupling efficiencies of such gratings are studied with respect to varying groove‐profiles. By the use of THz time domain spectroscopy the excitation and propagation of single‐ and multiple‐frequency SEWs are investigated. Such chirped gratings are shown to be a promising component for the forming of broadband THz SEWs.
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