{"title":"Dual-Polarization SPR Sensor of U-Shaped Photonic Crystal Fiber Coated with Au-TiO2","authors":"Xiaotong Guo, Tian Sang, Guofeng Yang, Yueke Wang","doi":"10.1007/s11468-024-02501-3","DOIUrl":null,"url":null,"abstract":"<p>We propose a surface plasmon resonance (SPR) sensor based on the U-shaped photonic crystal fiber (PCF) coated with Au-TiO<sub>2</sub> layers, which can detect the refractive index (RI) of the analyte. We introduce elliptical air holes near the fiber core, which can break the symmetry of PCF structural and lead to a strong birefringence for achieving dual-polarization sensors. Besides, the TiO<sub>2</sub> layer not only enhances the adhesion of Au and quartz but also improves the SPR effect. By using finite element method (FEM) numerical analysis, geometrical parameters are optimized to enhance sensors’ performances, and dual polarization demonstrates superior performance in different detection ranges, expanding the range of analyte detection. Finally, simulation results show that the detection range under the Y-polarization (X-polarization) is 1.20–1.30 (1.36–1.43), with a maximum wavelength sensitivity of 10200 nm/RIU (5900 nm/RIU). This sensor offers broad RI detection range and high sensitivity, promising extensive applications in environmental and medical diagnostics.</p>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"1 1","pages":""},"PeriodicalIF":3.3000,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Plasmonics","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1007/s11468-024-02501-3","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
We propose a surface plasmon resonance (SPR) sensor based on the U-shaped photonic crystal fiber (PCF) coated with Au-TiO2 layers, which can detect the refractive index (RI) of the analyte. We introduce elliptical air holes near the fiber core, which can break the symmetry of PCF structural and lead to a strong birefringence for achieving dual-polarization sensors. Besides, the TiO2 layer not only enhances the adhesion of Au and quartz but also improves the SPR effect. By using finite element method (FEM) numerical analysis, geometrical parameters are optimized to enhance sensors’ performances, and dual polarization demonstrates superior performance in different detection ranges, expanding the range of analyte detection. Finally, simulation results show that the detection range under the Y-polarization (X-polarization) is 1.20–1.30 (1.36–1.43), with a maximum wavelength sensitivity of 10200 nm/RIU (5900 nm/RIU). This sensor offers broad RI detection range and high sensitivity, promising extensive applications in environmental and medical diagnostics.
期刊介绍：
Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons.
Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.
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