Abstract-Design of a GaP/Si composite waveguide for CW terahertz wave generation via difference frequency mixing

Kyosuke Saito, Tadao Tanabe, and Yutaka Oyama   »View Author Affiliations

http://www.opticsinfobase.org/ao/abstract.cfm?uri=ao-53-17-3587

Applied Optics, Vol. 53, Issue 17, pp. 3587-3592 (2014)
http://dx.doi.org/10.1364/AO.53.003587

We design a GaP/Si composite waveguide to achieve efficient terahertz (THz) wave generation under collinear phase-matched difference frequency mixing (DFM) between near-infrared light sources. This waveguide structure provides a strong mode confinement of both near-infrared sources and THz wave, resulting in an efficient mode overlapping. The numerical results show that the waveguide can produce guided THz wave (5.93 THz) with a power conversion efficiency of6.6×10−4  W−1. This value is larger than previously obtained with the bulk GaP crystal: 0.5×10−9  W−1 [J. Lightwave Technol. 27, 3057 (2009)]. Our proposed composite waveguide can be achieved by bridging the telecom wavelength and THz frequency region.

© 2014 Optical Society of America