[16p-A202-1~14] 3.8 Terahertz technologies (formerly 3.9)

△ [16p-A202-3] THz vector beam generation from ZnTe crystal excited by circular polarized pulse

〇Hiroaki Iwase¹, Seigo Ohno^1,2 (1.Dept. Physics, Tohoku Univ., 2.Org. for Advanced Studies, Tohoku Univ.)

Keywords:terahertz wave, vector beam, nonlinear crystal

Vector beams have been expected applications due to the significant polarization and intensity distributions. A ZnTe crystal is one of the most useful nonlinear crystals for a terahertz (THz)-wave generation. The THz-wave generation is forbidden in [111] direction for a circular polarized pump pulse because of high symmetry. However, we found that a THz vector beam could be generated when the pump pulse was focused on the [111] surface of ZnTe crystals. Our experimental results obtained by a homemade THz-polarization imaging system show the radial vector beam was generated in the wideband THz region.