基于菲涅尔反射的磁流体折射率可调谐特性研究  

Study on the tunable properties of refractlive index of magnetic fluid based on Fresnel reflection theory

作　　者：荆雅洁 韩笑笑 杨濠琨 张书文 张锦龙[1] JING Ya-jie;HAN Xiao-xiao;YANG Hao-kun;ZHANG Shu-wen;ZHANG Jin-long(School of physics and electronics,Henan university,Kaifeng 475000,China)

机构地区：[1]河南大学物理与电子学院,河南开封475000

出　　处：《光电子．激光》2020年第7期669-674,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金项目(61675063,61975052);河南大学一流学科培育支持计划项目(2018YLTD06,2019YLZDCG02)资助项目。

摘　　要：为更好地利用磁流体折射率可调谐特性设计磁流体光栅、磁流体光纤调制器、磁场传感器等光学器件,本文通过理论分析,分别从磁场大小、方向、以及温度三个因素对磁流体折射率的可调谐特性进行研究。基于菲涅尔反射理论设计了用于测量磁流体折射率的微型封闭反射式传感探头,搭建了实验系统。采用已知样品标定法解决系统本征反射的干扰问题,分别调节磁场强度、传感探头与磁场夹角、温度,对磁流体折射率进行了测量,并通过磁电效应理论对实验结果进行了分析和验证。结果表明:在磁场作用下,磁流体折射率在光束电场与磁场方向呈不同夹角时,磁流体折射率随着磁场强度增大而呈现出递增和递减趋势,平行时递增趋势最明显,磁流体折射率变化0.017,垂直时递减趋势最明显,磁流体折射率变化0.0152;同时得到了磁流体折射率和温度拟合优度为0.98997的三次多项式方程。该研究结果对磁流体光学器件的结构设计具有重要意义。In order to make better use of the tunable properties of magnetohydrodynamic refractive index,optical devices such as magnetohydrodynamic grating,magnetohydrodynamic fiber modulator and magnetic field sensor are designed.Through theoretical analysis,this paper studies the tunability of magnetohydrodynamic refractive index from three factors of magnetic field size,direction and temperature.Based on Fresnel reflection theory,a miniature closed reflection sensor is designed to measure the refractive index of magnetic fluid.The known sample calibration method was used to solve the interference problem of the system′s intrinsic reflection.The magnetic field intensity,the Angle between the sensor and the magnetic field and the temperature were adjusted respectively.The refractive index of magnetic fluid was measured.Results show that under the effect of magnetic field,the magnetic liquid refractive index in the beam direction of electric and magnetic fields at different angles,magnetic liquid refractive index with the magnetic field strength increase and present a trend of increasing and decreasing,increasing trend,the most obvious when the parallel magnetic liquid refractive index changes in 0.017,when the vertical downward trend,the most obvious magnetic liquid refractive index change 0.015 2;At the same time,a cubic polynomial equation with refractive index and temperature fit of 0.989 97 is obtained.The results are of great significance to the structural design of magnetohydrodynamic optical devices.

关 键 词：磁流体 菲涅尔反射 折射率 磁电效应 

分 类 号：TN2[电子电信—物理电子学]