Kim Minkyung
School of Mechanical Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
Nanophotonics. 2023 Nov 22;12(24):4519-4528. doi: 10.1515/nanoph-2023-0675. eCollection 2023 Dec.
The spin Hall effect of light (SHEL), a microscopic and transverse splitting of linearly polarized light into circularly polarized components during refraction and reflection, can be measured at subnanometer scales using weak measurements and has emerged as a powerful candidate for precision measurements. However, despite the strong demand for compact and miniaturized sensors and precision metrology, no efforts have downsized the weak measurements. Here I demonstrate that the location of the interface where the SHEL occurs does not impact the results of weak measurements and building on this observation, propose a modified setup called the compact weak measurement to reduce the form factor by replacing one convex lens with a concave one. The concept is theoretically validated and numerically confirmed across various setup parameters and interfaces. The compact weak measurement effectively reduces the required free space distance by twice the focal length and will facilitate the implementation of SHEL-based precision measurements in practical applications.
光的自旋霍尔效应（SHEL）是指线偏振光在折射和反射过程中发生微观横向分裂，形成圆偏振分量，利用弱测量技术可在亚纳米尺度上对其进行测量，并且已成为精密测量的有力候选方法。然而，尽管对紧凑小型化传感器和精密计量有强烈需求，但尚未有人对弱测量进行小型化改进。在此，我证明了发生SHEL的界面位置不会影响弱测量结果，并基于这一观察结果，提出一种改进装置，称为紧凑弱测量，通过用凹透镜替换一个凸透镜来减小外形尺寸。该概念在理论上得到验证，并通过数值模拟在各种装置参数和界面条件下得到证实。紧凑弱测量有效地将所需的自由空间距离减少了两倍焦距，将有助于基于SHEL的精密测量在实际应用中的实现。
