Spoon-like Beams Generated with Exponential Phases

Spoon-like Beams Generated with Exponential Phases
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指数相位产生的勺状光束

DOI:
10.3390/coatings12030322
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发表时间:
2022-03
期刊:
影响因子:
3.4
通讯作者:
Shubo Cheng
Shubo Cheng
中科院分区:
材料科学3区
文献类型:
--
作者:
Lei Guo;Tian Xia;Yiping Xu;Yan Xiong;Xian Leng;Shaohua Tao;Yonghong Tian;Shubo Cheng

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在本文中,我们报道了一种新的光束,命名为“勺状”光束,产生的指数相位。从理论和实验上分析了匙状光束在焦平面上的光强分布和横向能流。结果表明:随着幂指数n的增大,匙形光束的尺寸增大,匙形光束的光强轨迹长度减小,且沿着光束的光强轨迹存在一个光强梯度,从而产生了作用于微粒的光强梯度力.光镊实验表明,聚焦后的光束可以形成勺状陷阱,实现对粒子的二维操纵。
In this paper, we report a new kind of beam, named “spoon-like” beams, generated with the exponential phase. The intensity distributions and transverse energy flow of the spoon-like beam at the focal plane are analyzed theoretically and experimentally. The results demonstrate that the size of the spoon-like beam becomes enlarged with the increasing power exponent n, and the length of the spoon-like intensity trajectory becomes shorter with the increasing parameter p. Furthermore, there is an intensity gradient along the spoon-like trajectory of the beam, which introduces the intensity-gradient force exerted onto microparticles. The experiment on optical tweezers demonstrates that the focused beams can create spoon-like traps for the two-dimensional manipulation of particles.
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