title: Efficient terahertz-wave generation via four-wave mixing in silicon membrane waveguides.
abstract: Terahertz (THz) wave generation via four-wave mixing (FWM) in silicon membrane waveguides is theoretically investigated with mid-infrared laser pulses. Compared with the conventional parametric amplification or wavelength conversion based on FWM in silicon waveguides, which needs a pump wavelength located in the anomalous group-velocity dispersion (GVD) regime to realize broad phase matching, the pump wavelength located in the normal GVD regime is required to realize collinear phase matching for the THz-wave generation via FWM. The pump wavelength and rib height of the silicon membrane waveguide can be tuned to obtain a broadband phase matching. Moreover, the conversion efficiency of the THz-wave generation is studied with different pump wavelengths and rib heights of the silicon membrane waveguides, and broadband THz-wave can be obtained with high efficiency exceeding 1%.
authors.affiliation: State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Science (CAS), Xi'an 710119, China.
authors.forename: Zhaolu
authors.initials: Z
authors.lastname: Wang
authors.forename: Hongjun
authors.initials: H
authors.lastname: Liu
authors.forename: Nan
authors.initials: N
authors.lastname: Huang
authors.forename: Qibing
authors.initials: Q
authors.lastname: Sun
authors.forename: Jin
authors.initials: J
authors.lastname: Wen