Title :
THz Generation From GaP Rod-Type Waveguides
Author :
Nishizawa, Jun-ichi ; Suto, Ken ; Tanabe, Tadao ; Saito, Kyosuke ; Kimura, Tomoyuki ; Oyama, Yutaka
Author_Institution :
Semicond. Res. Inst., Sendai
Abstract :
Terahertz (THz) generation was demonstrated from GaP rod-type waveguides via difference-frequency-mixing of near-infrared light using a collinear phase-matching condition. THz output peaks were observed, and appeared at frequencies corresponding to the fundamental and high-order waveguide modes. Interestingly, the position of the fundamental mode shifted to a higher frequency for a smaller waveguide cross-section, which is attributed to the waveguide confinement of the THz wave. The conversion efficiency was enhanced in the waveguide with a cross section of 200 mumtimes160 mum as compared to that in bulk GaP crystals
Keywords :
gallium compounds; optical phase matching; optical waveguides; submillimetre wave generation; 160 mum; 200 mum; GaP; GaP waveguide; bulk GaP crystals; collinear phase-matching; difference frequency-mixing; fundamental waveguide modes; high-order waveguide modes; near-infrared light; rod-type waveguide; terahertz generation; waveguide confinement; Biomedical optical imaging; Crystals; Design for manufacture; Electromagnetic waveguides; Frequency conversion; Laser excitation; Nonlinear optics; Optical frequency conversion; Optical waveguides; Waveguide discontinuities; Collinear phase matching; GaP; optical waveguide; phonon-polariton; terahertz (THz)-wave;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2006.890098
