研究目的
Investigating the mode splitting phenomenon in lossy dielectric waveguides and its relationship with mode coupling.
研究成果
The research discovered the mode splitting phenomenon in lossy dielectric waveguides and defined the mode splitting coefficient to quantify this phenomenon. It was found that the biggest mode splitting coefficient occurs at the mode cut-off wavelength. The study provides a new perspective on understanding mode coupling between lossless and lossy modes, which is valuable for the design of optical devices and sensors.
研究不足
The study is limited to the analysis of mode splitting in specific waveguide structures and may not account for all possible variations in waveguide materials and configurations.
1：Experimental Design and Method Selection:
The research utilized finite element method (FEM) to analyze the mode field distributions and effective mode refractive index in a fiber waveguide coated with lossy dielectric nanofilms.
2：Sample Selection and Data Sources:
The study focused on a fiber waveguide structure with silica inner layer and titanium dioxide (TiO2) nanofilm outer layer.
3：List of Experimental Equipment and Materials:
COMSOL Multiphysics (version
4：3a) was used for simulations. The materials included silica fiber core and TiO2 nanofilms. Experimental Procedures and Operational Workflow:
The incident wavelength was swept from 400 nm to 2000 nm to obtain mode field distribution and effective mode refractive index.
5：Data Analysis Methods:
The relationship between the imaginary part of mode effective index and incident wavelength was analyzed, and the mode splitting coefficient was defined to describe the degree of mode splitting.
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