研究目的
To design and analyze a nonlinear Photonic Crystal Fiber (PCF) based sensor for detecting liquid analytes with high birefringence, high sensitivity, low confinement loss, and high nonlinearity.
研究成果
The proposed PCF design, particularly with a horizontally aligned elliptical core hole (PCF1), achieves high birefringence (5.09×10^-3), high sensitivity (41.37%), low confinement loss (2.17×10^-10 dB/m), and high nonlinearity (74.75 W^-1km^-1) at 1.3 μm wavelength for water sensing. It outperforms prior PCF designs and is suitable for sensing and biomedical applications, with potential for fabrication using existing techniques like sol-gel method.
研究不足
The study is based on numerical simulations and does not involve experimental validation. Fabrication complexities, such as selectively filling the core hole with analytes and potential variations in global parameters during fabrication (up to ±3%), could affect performance. The design may have trade-offs between sensitivity and nonlinearity.
1：Experimental Design and Method Selection:
The study uses a numerical investigation based on the full vector Finite Element Method (FEM) with Perfectly Matched Layer (PML) boundary conditions to analyze the PCF structure. The design involves a hexagonal arrangement of circular air holes in the cladding and an elliptical hole in the core infiltrated with liquid analytes like water.
2：Sample Selection and Data Sources:
The targeted material is water, with refractive index governed by Sellmeier's equation. Sellmeier constants for silica and water are used from referenced literature.
3：List of Experimental Equipment and Materials:
No physical equipment is used as it is a numerical simulation; materials include pure silica (SiO2) and water.
4：Experimental Procedures and Operational Workflow:
The cross-section is meshed into triangular elements (11,580 elements with 104,761 degrees of freedom), and Maxwell's equations are solved using FEM to compute parameters like effective refractive index, birefringence, confinement loss, sensitivity, and nonlinear coefficient over wavelengths from
5：6 to 6 μm. Data Analysis Methods:
Data is analyzed by plotting variations with wavelength and ellipticity, and comparing with prior PCF designs.
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