通过光谱工程位置映射的多路多分量自加速光束
Multi-path multi-component self-accelerating beams through spectrum-engineered position mapping
摘要：
我们介绍了空间光谱相位梯度的概念，并从理论和实验上证明，这个概念可以用来产生单路和多路自加速光束。特别是，我们表明，加速光束的轨迹是由不同的关键空间频率，通过直接频谱到距离映射的先验。在非傍轴制度，我们的结果清楚地说明了从不同的角度来看，分裂的艾里光束，并演示了如何圆形，椭圆形或双曲线加速光束可以创建明智的工程频谱相位。此外，我们发现加速光束仍然遵循预测的轨迹矢量波前。我们的方法不仅概括了沿任意凸轨迹的傅立叶空间光束工程的思想，而且还提供了通过标准直接实空间方法或时域相位调制无法实现的光束/脉冲操纵的新可能性。
英文摘要：
We introduce the concept of spatial spectral phase gradient, and demonstrate, both theoretically and experimentally, how this concept could be employed for generating single- and multi-path self-accelerating beams. In particular, we show that the trajectories of the accelerating beams are determined a priori by different key spatial frequencies through direct spectrum-to-distance mapping. In the non-paraxial regime, our results clearly illustrate the breakup of Airy beams from a different perspective, and demonstrate how circular, elliptic or hyperbolic accelerating beams can be created by judiciously engineering the spectral phase. Furthermore, we found that the accelerating beams still follow the predicted trajectory also for vectorial wavefronts. Our approach not only generalizes the idea of Fourier-space beam engineering along arbitrary convex trajectories, but also offers new possibilities for beam/pulse manipulation not achievable through standard direct real-space approaches or by way of time-domain phase modulation.
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