研究目的
To propose a U-shaped external photonic quasi-crystal fiber (PQF) sensor based on surface plasmon resonance for refractive index (RI) sensing with high sensitivity.
研究成果
The U-shaped external PQF sensor proposed in this paper shows excellent performance in both maximum sensitivity and average sensitivity, achieving a maximum sensitivity of 33600 nm/RIU and an average sensitivity of 21643.75 nm/RIU. The results demonstrate the feasibility of stimulating the gold/liquid SPP mode in the external fiber with high sensitivity for real-time diagnostics of the analyte.
研究不足
The study is limited to the analysis of the sensor's performance under specific structural parameters and analyte RIs. The practical fabrication challenges and the uniformity of the metal film thickness are not extensively discussed.
1：Experimental Design and Method Selection:
The study involves designing a U-shaped external PQF sensor to stimulate the metal/liquid SPP mode for sensing applications. The finite element method is used for numerical simulation analysis.
2：Sample Selection and Data Sources:
The sensor's performance is analyzed under different analyte RIs (na∈[1.420, 1.436]).
3：420, 436]).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The sensor is fabricated using the sol-gel method, and a U-shaped trench is engraved by a femtosecond laser micromachining system. A gold layer is coated at the bottom of the trench.
4：Experimental Procedures and Operational Workflow:
The dispersion property of silica is described by the Sellmeier equation. The impact of RI on resonance coupling is investigated, and the influence of PQF structural parameters on sensor performance is analyzed.
5：Data Analysis Methods:
The propagation loss is calculated by the imaginary part of the effective RI (Im (neff)).
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