研究目的
To control orbital angular momentum (OAM) characteristics such as topological charge, dispersion, and confinement loss in circular photonic crystal fibers (C-PCFs) using optofluidic infiltration without changing the geometrical parameters.
研究成果
The research demonstrates that optofluidic infiltration into C-PCFs allows effective control of OAM mode characteristics, including topological charge, dispersion, and confinement loss, without altering the fiber's geometry. The controlled modes exhibit flat dispersion and low loss, making them suitable for applications in space-division multiplexing systems. Future work could focus on experimental realization and expanding the range of controllable parameters.
研究不足
The study is based on simulations and does not include experimental validation. The range of optical fluid refractive indices is limited to nF=1.3, 1.35, and 1.4, and the wavelength range is confined to 1.25-2.0 μm. Potential optimizations could involve broader parameter ranges or experimental testing.
1：Experimental Design and Method Selection:
The study uses a full-vector finite element method (FEM) for simulations to analyze mode characteristics in C-PCFs. The design is based on a specific C-PCF structure with fixed geometrical parameters, and optical fluids with different refractive indices are introduced into the first ring of air holes in the cladding.
2：Sample Selection and Data Sources:
A specific design of C-PCF from Ref. [19] is used, with parameters including air hole radius of 0.8 μm, central air hole radius of 1.2 μm, cladding pitch of 2 μm, and background material of silica. Optical fluids with refractive indices nF=1.3, 1.35, and 1.4 are considered.
3：8 μm, central air hole radius of 2 μm, cladding pitch of 2 μm, and background material of silica. Optical fluids with refractive indices nF=3, 35, and 4 are considered.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The materials include silica for the fiber background, air for holes, and optical fluids with specified refractive indices. No specific equipment brands or models are mentioned; simulations are performed computationally.
4：Experimental Procedures and Operational Workflow:
The workflow involves simulating the C-PCF structure using FEM with boundary conditions including a perfectly matched layer (PML). Meshing is done with free triangular elements in 2D, and mode characteristics are computed numerically over a wavelength range of 1.25-2.0 μm with 100 points.
5：25-0 μm with 100 points.
Data Analysis Methods:
5. Data Analysis Methods: Data analysis includes calculating effective index, dispersion, confinement loss, and effective index differences between modes. The condition for OAM mode support (Δneff > 10^-4) is used to evaluate mode degeneracy.
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