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We report on the generation of broadband terahertz (THz) pulses using Cherenkov-type generation in magnesium oxide-doped lithium niobate (MgO:LN). The efficiency of the output coupling process of THz radiation at higher frequencies into free space is considerably increased by the use of a properly cut silicon prism. The achieved spectrum is broader compared to the normal Cherenkov-cut geometry. Due to a considerably reduced propagation length in the absorbing MgO:LN, the effective application of longer crystals is possible. Thus, the measured spectral in tensity is much higher and the spectrum broader

The generation and propagation of surface plasmon polaritons in periodic metallic structures using femtosecond terahertz pulses is reported. The transmission and emission properties clearly show the influence of Wood’s anomalies. The velocity of propagation is determined experimentally and is in good agreement with a simple model.

The frequency response of a two-dimensional structure of metallic cylindrical rods having one-dimensional periodicity is reported. The structure is excited under transverse electric incidence of terahertz radiation, where the periodicity is of the size of the diameter of the rods. The response shows metallic behavior and leads to an effective plasma frequency which determines the lowest frequency of transmission. The results are confirmed by three independent investigations: An approximate analytic theory, computational simulations, and experiments.

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