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Spatially resolved multimode excitation for smooth supercontinuum generation in a SiN waveguide
Optics Express
|February 24, 2023
Summary
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.
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.
