倾斜长周期光纤光栅薄膜传感器设计

来源 :第四届全国信息光学与光子器件学术会议 | 被引量 : 0次 | 上传用户:a327581460
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  基于耦合模理论,研究了表面镀制高折射率敏感薄膜的倾斜长周期光纤光栅(TLPFG)耦合特性和薄膜折射率传感特性.TLPFG 能激发高阶(角向序数狀>1)包层模耦合,高阶包层模耦合系数随倾角增大而增大,θ<80°时,高阶包层模耦合系数远小于1阶包层模耦合系数.研究表明,光栅倾角变化不影响包层模耦合谐振波长,但影响光谱透过率.研究了TLPFG在θ<80°时1阶5次包层模耦合的光谱透过率对薄膜折射率变化的响应,分析了光栅结构参数(犔、Λ、θ )和薄膜参数(犺3,狀3)对响应灵敏度的影响,结果表明,响应灵敏度相比于非倾斜LPFG 可提高一个数量级,对薄膜折射率的分辨率可达10-9.
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