We report on investigations of the angular distribution of the radiation emitted from a terahertz antenna system equipped with a truncated spherical silicon lens. The pattern is calculated by wide-angle interference principles and Huygens–Fresnel diffraction theory. Experimental determination of the radiation pattern is performed by spatially resolved terahertz time-domain spectroscopy. Good agreement between theory and experiment is obtained, and we find that the terahertz beam can be represented by a Gaussian beam emitted from a circular aperture equal to the diameter of the lens.
© 1995 Optical Society of America
Original Manuscript: September 27, 1994
Published: April 15, 1995
P. Uhd Jepsen and S. R. Keiding, "Radiation patterns from lens-coupled terahertz antennas," Opt. Lett. 20, 807-809 (1995)