Fu Yanan, Wang Yulong, Zhang Yuquan, He Yejun, Min Changjun, Yuan Xiaocong
Opt Express. 2022 Mar 28;30(7):10758-10769. doi: 10.1364/OE.455148.
In recent years, singular optical beams, including optical vortex (OV) beams with phase singularities and cylindrical vector beams (CVBs) with polarization singularities, have brought new degrees of freedom for many applications. Although there have been various microscale devices for OV detection, the detection of CVBs with a microscale device is still a challenge. Here, we propose a new method for detection of CVBs with a designed on-chip plasmonic spin-Hall metalens structure. The focal position of the metalens and the splitting effect of at focus are studied in both an analytical model and numerical simulation. The results demonstrate that the metalens can not only detect different polarization orders of incident CVBs but also have an ability to distinguish radial, azimuthal and other vectorial polarization states under the same order of CVBs. This method has potential applications in compact integrated optical communication and processing systems.
近年来，包括具有相位奇点的光学涡旋（OV）光束和具有偏振奇点的圆柱矢量光束（CVB）在内的奇异光束，为许多应用带来了新的自由度。尽管已经有各种用于OV检测的微尺度器件，但利用微尺度器件检测CVB仍然是一个挑战。在此，我们提出了一种利用设计的片上等离子体自旋霍尔超透镜结构检测CVB的新方法。在解析模型和数值模拟中都研究了超透镜的焦点位置和焦点处的分裂效应。结果表明，该超透镜不仅可以检测入射CVB的不同偏振阶数，而且在相同阶数的CVB下具有区分径向、方位角和其他矢量偏振态的能力。该方法在紧凑型集成光通信和处理系统中具有潜在应用。
