Einstein beams: optical beams following gravitationally lensed trajectories
Einstein beams: optical beams following gravitationally lensed trajectories
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DOI：
10.1117/12.2582367
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
E. Galvez;J. M. Freedman
中科院分区：
文献类型：
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作者：
E. Galvez;J. M. Freedman
我们使用空间光调制器（SLM）来模拟重力的影响，并引导激光器发出的光，用实验室相机观察爱因斯坦环。SLM的相位的导出编程遵循与影响参数的对数依赖关系。正如预期的那样，当源和透镜对象与观察者不在一条直线上时，我们也会观察到弧。不同参数的测量结果与预期一致。被编程为遵循引力透镜轨迹的相干光束具有与贝塞尔函数一致的横模，但它们不表现出贝塞尔光束的非衍射特性：它们随着传播距离线性扩展。添加的涡旋相位也产生的模式，符合贝塞尔模式的顺序给出的拓扑电荷的涡旋。
We use a spatial light modulator (SLM) to mimic the effect of gravity and steer the light from a laser to observe Einstein rings with a laboratory camera. The derived programming of the phase of the SLM follows a logarithmic dependence with impact parameter. As expected, we also observe arcs when the source and lensing object are not in line with the observer. Measurements for distinct parameters are consistent with the expectations. The coherent optical beams that are programmed to follow gravitational lensing trajectories have a transverse mode consistent with Bessel functions, yet they do not exhibit the non-diffracting properties of Bessel beams: they expand linearly with the propagation distance. The addition of a vortex phase also produces patterns that coincide with Bessel modes of order given by the topological charge of the vortex..