Shaping diffraction-free Lommel beams with digital binary amplitude masks.
Shaping diffraction-free Lommel beams with digital binary amplitude masks.
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DOI：
10.1364/ao.54.007553
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发表时间：
2015-09
期刊：
影响因子：
1.9
通讯作者：
Qian Zhao;L. Gong;Yin-mei Li
中科院分区：
文献类型：
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作者：
Qian Zhao;L. Gong;Yin-mei Li
在这里，我们报告的实验观察到的各种洛梅尔模式，具有不同的无衍射行为。设计了二值幅度掩模，利用超像素方法对复场信息进行精确编码。然后，所需的光束的产生演示与这些二进制模式投影到数字微镜器件（DMD）。值得注意的是，我们发现，场分布和轨道角动量可以连续工程通过调整光束参数。此外，这种光束的形状不变的特点是由其远场环形结构验证。我们的观测结果与理论预测相一致，我们的方法可能在光学制导和成像中找到潜在的应用。此外，除了DMD，二进制振幅全息图也可以与制作良好的元件，因此，我们的方法也将使表面等离子体激元以及电子束的新应用。
Here, we report on experimental observations of various Lommel modes that possess distinct diffraction-free behaviors. The binary amplitude masks are designed to accurately encode the complex field information with the superpixel method. Then, the generation of the desired beams is demonstrated with these binary patterns projected onto the digital micromirrors device (DMD). Remarkably, we find that the field distribution and orbital angular momentum can be continuously engineered by tuning the beam parameters. Furthermore, the shape-invariant feature of such beams is verified by their far-field ring-like structures. Our observations are in good accordance with the theoretical predictions, and our methods may find potential applications in optical guiding and imaging. Moreover, apart from the DMD, the binary amplitude hologram can also be presented with well-fabricated elements, and thus, our method will also enable new applications for surface plasmon polaritons as well as electron beams.