Characterization of visible-mid-infrared supercontinuum spectrum based on sandwiched silicon nitride waveguide
This paper introduces a low-thickness sandwich waveguide structure comprising silicon nitride-sapphire-sili-con nitride layers.By exploiting its dispersion wave radiation effect and mid-infrared phase matching condition,com-bined with the waveguide pulse transmission model,this study examines the impact of different physical sizes of the sandwich waveguide on the phase matching point and spectral broadening.Through numerical simulation,a supercon-tinuum spectrum ranging from 0.5-4 μm is generated,producing a farther mid-infrared dispersion wave at a-40 dB lev-el.Moreover,this model provides an in-depth mechanism for nonlinear waveguide pulse transmission.Theoretical anal-ysis reveals that modifying the physical size of the silicon nitride and sapphire interlayer and altering the phase-matching conditions can regulate the position of the dispersion wave across a broader wavelength range.
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