Luo Lan, He Yu, Liu Xiong, Li Zhaoxue, Duan Pi, Zhang Zhiyou
Opt Express. 2020 Mar 2;28(5):6408-6416. doi: 10.1364/OE.386017.
In this paper, a method to measure the tiny spin splitting of the spin Hall effect of light (SHEL) using the almost-balanced weak measurement (ABWM) is presented. The ABWM technique uses two orthogonal post-selected states to record all of the information, which is a precise measurement method being different from the standard weak measurement (SWM). The theory model to describe the SHEL measurement based on ABWM is established. As results, the ABWM scheme has a larger amplification factor, reaching ∼10, which is nearly one order of magnitude higher than that of the SWM. When the post-selected angle is less than a certain value, the sensitivity and amplification factor of the ABWM scheme are higher than those of the SWM scheme, while the measurement precision and SNR of the ABWM technique are comparable to those of the SWM scheme. This research may have great potential for the precision metrology or sensing field based on the SHEL measurement.
本文提出了一种利用几乎平衡弱测量（ABWM）来测量光自旋霍尔效应（SHEL）微小自旋分裂的方法。ABWM技术使用两个正交的后选择态来记录所有信息，这是一种与标准弱测量（SWM）不同的精确测量方法。建立了基于ABWM描述SHEL测量的理论模型。结果表明，ABWM方案具有更大的放大因子，达到~10，比SWM的放大因子高近一个数量级。当后选择角度小于某一值时，ABWM方案的灵敏度和放大因子高于SWM方案，而ABWM技术的测量精度和信噪比与SWM方案相当。这项研究在基于SHEL测量的精密计量或传感领域可能具有巨大潜力。
