A novel quasi-optical resonator for the surface near-millimeter waves

The theory and experimental investigations are presented for a new type of quasi-optical near-millimeter-wave prismatic resonator, which provides freq uency selective transformation of the plane waves into the surface waves, T heoretical expressions are obtained for the Q-factor and finesse, which con sider dielectric loss and the effect of prism finite aperture. The theoreti cal evaluations are verified by experimental measurements in the frequency range 300-500 GHz using prismatic resonator made from the optical quality f used silica glass. The increase of intensity of surface waves by a factor o f 10-25 is demonstrated for the prismatic resonator made from an extremely low-loss dielectric.