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>104m1W1 and a very low propagation loss 3×103dB/μm accompanying the sub-λ scale (effective mode area Aeff3×102μm2) 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 17dB (22dB) 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.

© 2015 Optical Society of America

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