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Spatially resolved multimode excitation for smooth supercontinuum generation in a SiN waveguide.

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    We enhanced supercontinuum generation in silicon nitride waveguides by exciting multiple light modes. This method achieved a significant signal-to-noise ratio improvement, broadening the light spectrum.

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    Area of Science:

    • Nonlinear optics
    • Materials science

    Background:

    • Silicon nitride (SiN) waveguides are promising for nonlinear optics.
    • Standard pumping limits the nonlinear potential of SiN waveguides.
    • Multimode excitation can enhance light generation.

    Purpose of the Study:

    • To develop a method for enhanced supercontinuum generation.
    • To overcome limitations of standard pumping in SiN waveguides.
    • To broaden and flatten the supercontinuum spectrum.

    Main Methods:

    • Dispersion-engineered deuterated SiN (SiN:D) waveguide fabrication.
    • Numerical analysis and simulation of light propagation.
    • Spatial position offsets to excite fundamental and higher-order modes.

    Main Results:

    • Achieved bandwidth broadening with spectral flatness.
    • Obtained up to 18 dB SNR improvement at 0.6 µm.
    • Identified dispersive waves from TE10 and TE01 mode excitation.

    Conclusions:

    • Multimode excitation via spatial offsets enhances supercontinuum generation.
    • This technique unlocks the full nonlinearity of SiN materials.
    • Dispersive wave excitation is key to spectral broadening and flatness.