研究目的
Investigating the possibility of vortex modes propagation over planar dielectric rectangular waveguides and optimizing waveguide geometry for the support of vortex modes.
研究成果
The study demonstrates that rectangular waveguides can support vortex modes with high OAM purity for the first azimuthal order, but higher orders require specific phase matching conditions and exhibit lower purity. The findings suggest potential applications in integrated photonic circuits for OAM-based communication systems.
研究不足
The study is limited to planar dielectric rectangular waveguides and does not explore other waveguide geometries. The analytical model is approximate and becomes less accurate for higher index contrast waveguides. Higher azimuthal order vortex modes require more complex phase matching and exhibit lower OAM purity.
1：Experimental Design and Method Selection:
The study combines analytical modeling based on the Marcatili approach with numerical simulations using a full-vector finite difference eigenmode solver in MATLAB.
2：Sample Selection and Data Sources:
Silicon nitride waveguides on silica substrate, both symmetric and asymmetric configurations, are analyzed.
3：List of Experimental Equipment and Materials:
MATLAB for numerical simulations, silicon nitride waveguides.
4：Experimental Procedures and Operational Workflow:
The study involves setting waveguide dimensions to support specific eigenmodes, combining these modes into superpositions, and analyzing their OAM spectra.
5：Data Analysis Methods:
The OAM spectra of the modal superpositions are analyzed to determine the purity of the target OAM states.
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