利用手性卍字结构的傅里叶后焦面成像区分涡旋光束的拓扑电荷
Distinguishing the Topological Charge of Vortex Beam via Fourier Back Plane Imaging with Chiral Gammadion Structure
AI总结：
本文研究了手性金属卍字结构与SAM-OAM光束的相互作用，发现通过傅里叶后焦面成像不仅能识别结构的旋光性和几何性质，还能区分OAM拓扑电荷及符号，为光信息存储与通信提供了新见解。
摘要：
近年来，轨道角动量（OAM）与物质相互作用的研究不断涌现。OAM具有独特的性质，如额外的自由度、涡旋特性和拓扑性质，这扩展了其在光通信、光传感和光力方面的应用。通过q-plate产生的SAM-OAM光束与手性金属卍字结构相互作用的实验，我们观察到了纯自旋角动量（SAM）光束中不存在的现象。SAM光束激发下的傅里叶后焦面（FBP）成像可以容易地识别结构的旋光性和几何性质。当SAM-OAM光束激发该结构时，FBP不仅能识别其旋光性和几何性质，还能区分不同的OAM拓扑电荷及符号，以及椭圆偏振度。斯托克斯参数FBP成像揭示了涡旋光束与手性结构相互作用导致的不对称偏振分布。此外，它清楚地反映了SAM到OAM的转换过程。实验结果与模拟结果吻合良好。这些发现为利用OAM推进光信息存储和通信提供了有价值的见解，为该领域的进一步探索开辟了新的可能性。
英文摘要：
In recent years, research on the interaction between Orbital Angular Momentum (OAM) and matter has seen a continuous influx of investigations. OAM possesses distinct properties, such as additional degrees of freedom, vortex characteristics, and topological properties, which expand its applications in optical communication, optical sensing, and optical force. Through experiments involving the interaction of a chiral metal swastika structure with a SAM-OAM beam generated by a q-plate, we have observed a phenomenon does not present in pure SAM beams. Fourier back focal plane (FBP) imaging under SAM beam excitation easily identifies the chirality and geometric properties of the structure. When the SAM-OAM beam excites the structure, FBP not only identifies its chirality and geometric properties but also distinguishes different OAM topological charges and signs, as well as the degree of elliptic polarization. The stokes parametric FBP imaging reveals asymmetric polarization distribution resulting from the interaction between a vortex beam and the chiral structure. Moreover, it clearly reflects the conversion process of SAM to OAM. The experimental results align well with simulation results. These findings hold valuable insights for the advancement of optical information storage and communication using OAM, opening up new possibilities for further exploration in this field.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
