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采用有限元法分析了基于金纳米层的新型微结构光纤表面等离子体共振传感器的相关特性。在数值仿真中,使用精确的德鲁德-洛伦兹(Drude-Lorentz)模型来描述金属介电常数。计算结果表明,随待测样品折射率的增加,表面等离子体共振峰波长向长波长方向漂移。该微结构光纤表面等离子体共振传感器的探测灵敏度可达1200 nm/RIU(refractive index unit),探测极限可达8.33×10-5RIU。
The finite element method is used to analyze the related properties of the novel microstructured fiber surface plasmon resonance sensor based on gold nanometer layer. In numerical simulations, the accurate Drude-Lorentz model is used to characterize the metal dielectric constant. The results show that with the increase of the refractive index of the sample under test, the surface plasmon resonance peak wavelength shifts to long wavelength. The microstructure optical fiber surface plasmon resonance sensor detection sensitivity of up to 1200 nm / RIU (refractive index unit), detection limit of up to 8.33 × 10-5RIU.