Generation of X-ray vortex with ultra-long depth of focus using axial line-focused spiral zone plates
Huaping Zang1, Chenglong Zheng1, Quanping Fan2, Chuanke Wang2, Lai Wei2, Leifeng Cao2, Xiangru Wang3, and Erjun Liang1
1 School of Physics and Engineering, [Zhengzhou University], Zhengzhou 450001, China
2 [Research Center of Laser Fusion, China Academy of Engineering Physics], Mianyang 621900, China
3 School of Optoelectronic Information, [University of Electronic Science and Technology of China], Chengdu 610054, China

Chin. Opt. Lett., 2018, 16(08): pp.080501

DOI:10.3788/COL201816.080501
Topic:Diffraction and gratings
Keywords(OCIS Code): 050.1220  050.1940  050.1965  050.1970  

Abstract
We propose axial line-focused spiral zone plates (ALFSZPs) for generating tightly focused X-ray vortex beams with ultra-long depth of focus (DOF) along the propagation direction. In this typical design, compared with the conventional spiral zone plates (SZPs) under the same numerical aperture (NA), the DOF of ALFSZPs has been extended to an ultra-length by optimizing the corresponding parameters. Besides, it also exhibits lower side lobes and smaller dark cores in the whole focus volume. The diameters of dark cores increase as the topological charge value increases.

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Received:2018/3/5
Accepted:2018/6/6
Posted online:2018/7/27

Get Citation: Huaping Zang, Chenglong Zheng, Quanping Fan, Chuanke Wang, Lai Wei, Leifeng Cao, Xiangru Wang, and Erjun Liang, "Generation of X-ray vortex with ultra-long depth of focus using axial line-focused spiral zone plates," Chin. Opt. Lett. 16(08), 080501(2018)

Note: This research was supported by the National Natural Science Foundation of China (Nos. 11404290, 61307019, 11504333, and 61505178), the National Key Scientific Instruments and Equipments Development of Special Item, China (No. 2012YQ130125), the Postdoctoral Science Foundation of Henan Province (No. 2013008), and the Program for Science & Technology Innovation Talents in Universities of Henan Province (No. 172102210481).



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