Khanom Fatima, Mohamed Nawal, Lopushenko Ivan, Sdobnov Anton, Doronin Alexander, Bykov Alexander, Rafailov Edik, Meglinski Igor
College of Engineering and Physical Sciences, Aston University, Birmingham, B4 7ET, UK.
Optoelectronics and Measurement Techniques, University of Oulu, P.O. Box 4500, 90014, Oulu, Finland.
Sci Rep. 2024 Sep 5;14(1):20662. doi: 10.1038/s41598-024-70954-x.
We explore the propagation of structured vortex laser beams-shaped light carrying orbital angular momentum (OAM)-through complex multiple scattering medium. These structured vortex beams consist of a spin component, determined by the polarization of electromagnetic fields, and an orbital component, arising from their spatial structure. Although both spin and orbital angular momenta are conserved when shaped light propagates through a homogeneous, low-scattering medium, we investigate the conservation of these angular momenta during the propagation of Laguerre-Gaussian (LG) beams with varying topological charges through a turbid multiple scattering environment. Our findings demonstrate that the OAM of the LG beam is preserved, exhibiting a distinct phase shift indicative of the 'twist of light' through the turbid medium. This preservation of OAM within such environments is confirmed by in-house developed Monte Carlo simulations, showing strong agreement with experimental studies. Our results suggest exciting prospects for leveraging OAM in sensing applications, opening avenues for groundbreaking fundamental research and practical applications in optical communications and remote sensing.
我们研究了携带轨道角动量（OAM）的结构化涡旋激光束形状的光在复杂多重散射介质中的传播。这些结构化涡旋光束由自旋分量和轨道分量组成，自旋分量由电磁场的极化决定，轨道分量则源于其空间结构。尽管当形状光在均匀的低散射介质中传播时，自旋和轨道角动量都是守恒的，但我们研究了具有不同拓扑电荷的拉盖尔 - 高斯（LG）光束在浑浊多重散射环境中传播时这些角动量的守恒情况。我们的研究结果表明，LG光束的OAM得以保留，表现出明显的相位偏移，这表明光在浑浊介质中发生了“扭曲”。通过内部开发的蒙特卡罗模拟证实了在这种环境中OAM的保留，模拟结果与实验研究高度吻合。我们的结果为在传感应用中利用OAM展现了令人兴奋的前景，为光通信和遥感领域的开创性基础研究和实际应用开辟了道路。
