Abstract
The efficient excitation of coherent THz phonons requires an electric field as high as possible at the surface of the piezoelectric transducer material. This can be done below 10 11Hz by means of a coaxial resonator or a cavity resonator, respectively. At still higher frequencies new kinds of suitable resonators must be developed. In this paper two types of low-mode submillimeterwave resonators, a dielectric waveguide resonator and a two-layer Fabry-Perot resonator, are investigated with respect to their electromagnetic properties in the THz range.
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