title: Surface-emitted terahertz-wave difference-frequency generation in two-dimensional periodically poled lithium niobate.
abstract: We report on the demonstration of surface-emitted terahertz- (THz-) wave difference-frequency generation from two-dimensional (2D) periodically poled lithium niobate (PPLN). The two orthogonal periodic structures individually compensate for both the phase mismatch of the launched lasers and the generated THz wave. Tunable 1.5-1.8 THz wave generation with a bandwidth of 10-GHz was obtained by use of two 2D PPLN crystals. We also confirmed that THz waves were simultaneously generated into two opposite directions, which suggests the possibility of higher THz-wave output power.
authors.affiliation: Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan. yuzo@riec.tohoku.ac.jp
authors.forename: Yuzo
authors.initials: Y
authors.lastname: Sasaki
authors.forename: Yuri
authors.initials: Y
authors.lastname: Avetisyan
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yokoyama
authors.forename: Hiromasa
authors.initials: H
authors.lastname: Ito