Abstract
Wire gratings are widely used for different applications, such as polarizers, beam splitters, phase shifters and so on. Such gratings are fabricated by placing conducting wires within an aperture formed by a metal ring. When H-polarized electromagnetic wave is incident on the grating with electric vector is parallel to the grating wires, the wave is almost totally reflected by the grating as if it was a flat mirror. In the case of E-polarization (electric vector is perpendicular to the grating wires) the incident field is almost completely transmits through the grating. That feature allows us to use wire gratings as an output mirrors of THz lasers. Such mirrors give us an ability to modify and optimize a laser coupling coefficient with an external environment and provide controlling the polarization of the laser output beam without distortion.
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