煤油基Fe_3O_4磁性液体薄层的光学特性研究  

Study on Optical Properties of Kerosene-Based Fe_3O_4 Magnetic Liquid Film

作　　者：陆樟献[1] 王军[2] 夏肆华[2] 

机构地区：[1]浙江万里学院应用物理研究所,浙江宁波315101 [2]浙江宁波大学理学院,浙江宁波315211

出　　处：《光学学报》2011年第2期165-172,共8页Acta Optica Sinica

基　　金：浙江省科学技术厅(2009C31149);浙江省教育厅(Y200909206)资助课题

摘　　要：为研究煤油基Fe3O4磁性液体在磁场作用下的双折射效应和二向色性特性,根据振荡磁偶极子模型进行了理论分析和模拟计算,并设计了用于测试磁性液体光学特性的实验平台,测量了不同体积密度下的光学特性。通过理论分析和模拟计算发现,不同方向偏振光的折射系数和消光系数随磁场的变化相反,平行偏振光的折射系数和消光系数随外加磁场的增大而降低,而垂直偏振光的折射系数和消光系数随外加磁场的增大而增大;折射系数和消光系数与磁性液体的体积密度成正比;玻璃-磁性液体界面的透射率随磁场的变化很小。实验平台下的归一化输出光强的模拟计算结果和实验结果一致,从而为磁性液体在光开关、磁场和电流测量等方面的应用提供了理论和实验依据。The purpose is to study the linear birefringence and dichroism properties of the kerosene-based Fe3O4 magnetic fluid under the magnetic field, which have been theoretically analyzed and simulated numerically based on the dipole oscillation model. The experimental platform is designed to test the optical properties of kerosene-based Fe3O4 magnetic liquid in different volume densities under the magnetic field. The theory and numerical simulation show that the birefringence and dichroism of different polarized light have different variation trend under the magnetic field~ the birefringence and dichroism of parallel polarized light decrease, but the ones of perpendicular polarized light increase~ those are in proportion to the volume density~ the transmittance in the interface between glass and ferrofluids is almost unchangeable. The experimental result is in agreement with the numerical simulation that provides the theoretical and experimental basis for designing the light switch and the application in measurement of the magnetic field and current sensors.

关 键 词：物理光学 磁光效应 振荡磁偶极子 磁性液体 光传感 

分 类 号：O436.3[机械工程—光学工程]