Partially Coherent Dual Nonparaxial Accelerating Beams

Partially Coherent Dual Nonparaxial Accelerating Beams
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部分相干双非旁轴加速光束

DOI:
10.1002/andp.202000438
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发表时间:
2020-12
期刊:
影响因子:
2.4
通讯作者:
Daomu Zhao
Daomu Zhao
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zishuai Zeng;Daomu Zhao

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从全相干模和这些模之间的非相干干涉效应叠加的角度出发,构造了部分相干双非傍轴加速光束。结果表明,这种光束的发散角和部分相干性可以通过曲率参数来改变。在传播开始时,这种光束在建设性干涉的情况下聚焦,但在破坏性的情况下留下中心凹陷。此外,干涉引起的十字形光强分布的扩展明显慢于横梁框架的扩展。特别是,沿着微米尺度上的非傍轴加速轨迹移动,这些光束的主瓣可以发散到几乎平坦的角度。因此,这些光束很可能在微观粒子操纵和相干图像处理方面有应用。
Partially coherent dual nonparaxial accelerating beams are constructed from the perspective of a superposition of fully coherent modes and incoherent interference effects among these modes. It is found that divergence angle and partial coherence of such beams can be altered by a curvature parameter. At the beginning of the propagation, such beams focus in the case of constructive interference, but they leave a central dip in the destructive case. Additionally, the extension of a crossed‐shaped intensity distribution caused by interference is slower than that of the transverse beam frame evidently. In particular, moving along the nonparaxial accelerating trajectory on the micrometer scale, the main lobes of these beams can diverge to a nearly flat angle. As such, these beams are likely to have applications in microscopic particle manipulation and coherence image processing.
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