Wang Qi, Li Tong, Luo Lan, He Yu, Liu Xiong, Li Zhaoxue, Zhang Zhiyou, Du Jinglei
Opt Lett. 2020 Mar 1;45(5):1075-1078. doi: 10.1364/OL.383764.
In this Letter, we propose a technique for hysteresis loop measurement based on weak measurement. By using the photonic spin Hall effect (PSHE) as a probe and combining the quantum weak measurement, the technique's noise can be suppressed greatly. A theoretical model to describe the numerical relation between the amplified shift and Kerr rotation angle is established. Through detecting the amplified shift of the PSHE based on weak measurement, we experimentally measure the hysteresis loops of Ni-Fe alloy film, iron-phthalocyanine (FePc) monolayer film, and Co/FePc double-layer film. The results show that the precision can reach about $ \sim {10^{ - 6}} ;{\rm rad} $∼10rad under ordinary experimental conditions, which may have an important application prospect in magneto-optic parameters measurement.
在本信函中，我们提出了一种基于弱测量的磁滞回线测量技术。通过将光子自旋霍尔效应（PSHE）用作探针并结合量子弱测量，该技术的噪声可得到极大抑制。建立了一个理论模型来描述放大位移与克尔旋转角之间的数值关系。通过基于弱测量检测PSHE的放大位移，我们实验测量了镍铁合金薄膜、铁酞菁（FePc）单层薄膜和钴/铁酞菁双层薄膜的磁滞回线。结果表明，在普通实验条件下精度可达约( \sim {10^{ - 6}} ;{\rm rad} )，这在磁光参数测量中可能具有重要的应用前景。
