研究目的
To design and theoretically study a hybrid AsSe2–As2S5 photonic crystal fiber with high birefringence, large nonlinear coefficients, and two zero-dispersion wavelengths for applications in supercontinuum spectrum generation and polarization maintaining nonlinear signal processing.
研究成果
The proposed hybrid PCF achieves high birefringence (up to 0.091), large nonlinear coefficients (147.8 and 78.2 W?1m?1 for X- and Y-pol modes at 1.55 μm), and two zero-dispersion wavelengths for both polarization modes, making it suitable for polarization-dependent nonlinear optics applications such as supercontinuum generation and optical sensors. The simple structure facilitates potential fabrication, and parameter adjustments allow control over performance characteristics.
研究不足
The study is theoretical and relies on simulations, not experimental validation; fabrication challenges are noted for certain parameters (e.g., large air hole diameters or small aspect ratios), and material absorption loss is present but not fully characterized in the context of nonlinear applications.
1：Experimental Design and Method Selection:
The study uses a theoretical approach with the full-vector finite element method (FEM) implemented in COMSOL Multiphysics software, including perfectly matched layer (PML) boundary conditions, to analyze the optical properties of the proposed photonic crystal fiber (PCF).
2：Sample Selection and Data Sources:
The PCF design involves a solid elliptical core made of AsSe2 glass and a cladding with circular air holes made of As2S5 glass; material refractive indices are derived from Sellmeier equations based on prior literature.
3：List of Experimental Equipment and Materials:
Software: COMSOL Multiphysics; Materials: AsSe2 and As2S5 glasses with specified refractive indices.
4：Experimental Procedures and Operational Workflow:
Parameter sweeps are conducted for air hole diameter (d), core major diameter (a), and aspect ratio (R) to optimize birefringence, nonlinear coefficients, and dispersion; simulations are performed across wavelengths from
5：2 to 2 μm. Data Analysis Methods:
Birefringence is calculated as the difference in effective indices for X- and Y-polarized modes; nonlinear coefficients are computed using effective mode area and material nonlinear index; dispersion is derived from the second derivative of effective refractive index with respect to wavelength.
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