研究目的
To propose and numerically analyze a titanium nitride (TiN) coated highly sensitive PCF-SPR sensor design for liquid sensing applications, focusing on dependencies of confinement loss, wavelength sensitivity, and amplitude sensitivity on various parameters.
研究成果
The proposed TiN-coated PCF-SPR sensor achieves high wavelength sensitivity (up to 10,000 nm/RIU) and refractive index resolution (～2.0 × 10?5) in the RI range of 1.385–1.40, making it suitable for detecting low-concentration chemicals and biochemical analytes, with potential applications in lab-on-a-chip devices. Despite low amplitude sensitivity, the design offers advantages in sensitivity and miniaturization.
研究不足
The study is theoretical and numerical; no experimental validation is provided. The amplitude sensitivity is low due to polycrystalline TiN film on glass substrate, leading to additional carrier losses. Fabrication challenges for uniform coating and liquid infiltration are noted but not addressed experimentally.
1：Experimental Design and Method Selection:
The study uses numerical analysis based on Finite Element Method (FEM) to simulate the PCF-SPR sensor. Theoretical models include Sellmeier equation for silica refractive index and Drude-Lorentz model for TiN dielectric properties.
2：Sample Selection and Data Sources:
The sensor design involves a photonic crystal fiber (PCF) with specific air hole arrangements, coated with TiN and covered by a sensing channel filled with analyte liquids of refractive indices from
3：385 to List of Experimental Equipment and Materials:
Silica as background material, TiN coating, analyte liquids. No specific equipment models or brands are mentioned for fabrication or simulation tools.
4：Experimental Procedures and Operational Workflow:
The design parameters (e.g., air hole diameters, TiN thickness, channel width) are varied to optimize performance. Simulations are conducted using FEM with adaptive meshes and perturbation tests for accuracy.
5：Data Analysis Methods:
Confinement loss, wavelength sensitivity, and amplitude sensitivity are calculated using derived equations. Performance is compared with previously reported sensors.
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