研究目的
Investigating the sensitivity and resonance condition of a fiber optic sensor based on surface plasmon resonance (SPR) of gold thin film as a function of thickness of the metal.
研究成果
The obtained results indicate the importance of optimum thickness of the metallic layer for detecting small changes in refractive index of the sensing media. Selecting inappropriate thickness of the gold layer not only reduces the sensitivity of the sensor, but also changes the position of the resonance greatly which induces inaccuracy on calibrating the device.
研究不足
The study is limited to simulation and does not involve physical experimentation. The sensitivity and resonance condition of the device are investigated only as a function of thickness of the metal.
1：Experimental Design and Method Selection:
The study involves simulating a fiber optic sensor based on surface plasmon resonance (SPR) of gold thin film using COMSOL Multiphysics (optics module). A single-mode optical fiber was considered to be uncladed on its middle part and coated with a thin film of gold.
2：Sample Selection and Data Sources:
Two imaginary materials with refractive indexes of
3：2 and 22 were considered. List of Experimental Equipment and Materials:
COMSOL Multiphysics software, single-mode optical fiber, gold thin film.
4：Experimental Procedures and Operational Workflow:
The model was constructed in 2D environment of COMSOL
5：3a, showing the cross section of a single mode fiber. Free triangular was chosen as the mesh style for the entire geometry. Maximum element size of 10nm and minimum of 2nm were chosen for the entire geometry. Data Analysis Methods:
The effect of thickness of the gold on the sensitivity of the device was investigated by selecting three thicknesses of 5nm, 10nm and 20nm and simulating to see changes in the resulting spectrum of the sensor.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
