title: Quasi-phase-matched four-wave mixing generation between C-band and mid-infrared regions using a symmetric hybrid plasmonic waveguide grating.
abstract: A symmetric hybrid plasmonic waveguide (SHPW) configuration based on quasi-phase-matched (QPM) four-wave mixing (FWM) is proposed to realize efficient FWM conversion between the C-band and mid-infrared (mid-IR) regions. Due to the ability to allow strong confinement of light, an extremely large nonlinear parameter γ>104m-1W-1and a very low propagation loss ∼3×10-3dB/μm accompanying the sub-λ scale (effective mode area Aeff∼3×10-2μm2) are achieved by optimally designing the SHPW geometrical parameters. In addition, a QPM technique is adopted to achieve a relatively long effective length of FWM nonlinear process by constructing a long SHPW grating, thereby resulting in highly efficient wavelength conversion without rigorous dispersion engineering of waveguide structures. By using numerical simulations we have demonstrated that, for a pump wavelength of 1,800 nm, an efficient and flat FWM conversion of ∼-17  dB (∼-22  dB) could be realized around a target signal wavelength of the C-band: 1,530-1,565 nm (mid-IR: 2,118-2,180 nm), in a 1,000 μm-long grating with a serious phase mismatch.
authors.forename: Jing
authors.initials: J
authors.lastname: Dai
authors.forename: Minming
authors.initials: M
authors.lastname: Zhang
authors.forename: Feiya
authors.initials: F
authors.lastname: Zhou
authors.forename: Yuanwu
authors.initials: Y
authors.lastname: Wang
authors.forename: Luluzi
authors.initials: L
authors.lastname: Lu
authors.forename: Lei
authors.initials: L
authors.lastname: Deng
authors.forename: Deming
authors.initials: D
authors.lastname: Liu