Annular-focused beams have attracted attention because of their novel properties and applications in optical trapping, high resolution microscopy, and laser-induced periodic surface structuring. Generation of this beam is very important and necessary. In this article, a novel design of zone plate for forming the annular-focused beams is proposed. The design principle is introduced, and the characteristics of zone plate are analyzed by numerical simulation. The result shows that the zone plate can form a monochromatic ring-shaped intensity distribution in the focal plane. And the design method is also generally suitable for designing the other optical elements to generate the annular-focused beams.
* Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0206004), the National Natural Science Foundation of China (Grant No. 11375160), and the Science and Technology Fund from the Plasma Physics Laboratory, China (Grant No. ZY2018-01).
Cite this article:
Yong Chen(陈勇), Lai Wei(魏来), Qiang-Qiang Zhang(张强强), Quan-Ping Fan(范全平), Zu-Hua Yang(杨祖华), and Lei-Feng Cao(曹磊峰)† Zone plate design for generating annular-focused beams 2020 Chin. Phys. B 29 104202
Fig. 1.
Schematic diagram of concept of novel zone plate, showing (a) classic FZP, (b) linear FZP, and (c) its simulation results, (d) ring focal zone plate, (e) one-dimensional structure, and (f) its simulation results.
Fig. 2.
Structures of ring focal zone plates with different values of d.
Fig. 3.
Energy distributions and intensity profiles of ring focus with different values of d.
Fig. 4.
(a) Energy distribution and (b) intensity profiles of ring focus for three different wavelengths.
Fig. 5.
Wavelength-dependent normalized intensity of micro-focus.
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