Based on photonic crystal fiber and the surface plasma resonance technology,designed a new type of 8 hole photonic crystal fiber surface plasmon resonance sensing structure.Transfer matrix method is used to analyze the surface plasma resonance transmission characteristic of the sensor,the sensing performance analysis results show that with the increase of incidence Angle,the surface plasma resonant wavelength depth,half peak width narrow,incident Angle is 85°,the effect is ideal;The proportion,the greater the metal film sensor sensitivity will increase to a certain extent,measurement of liquid,the object under test sensitivity can reach 10-5.Design structure to reduce the effective refractive index of fiber core mold,solves the fiber core mold and the surface plasma resonance pattern phase matching problem,showed a high sensitivity and stability.%结合光子晶体光纤和表面等离子共振技术,设计了一种的新型的8孔光子晶体光纤的表面等离子共振传感结构.采用传输矩阵法分析了传感器的表面等离子共振传输特性.结果表明:随着入射角增大,表面等离子共振波长深度下降,半峰宽变窄,入射角为85 °,效果较为理想;金属薄膜占比越大,传感器的灵敏度会有一定的增加,测量液态待测物,灵敏度可达到10-5.设计结构降低了纤芯模的有效折射率,解决了纤芯模和表面等离子共振模式发生相位匹配问题,表现了较高的灵敏度以及稳定性.
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