Producing focused extreme ultraviolet vortex with Fermat-spiral photon sieves  

作　　者：Junyong Zhang Huaiyu Cui Yuanyuan Liu Xiuping Zhang You Li Dongdi Zhao Yongpeng Zhao Qiwen Zhan 

机构地区：[1]Key Laboratory of High Power Laser and Physics,Shanghai Institute of Optics and Fine Mechanics,Qinghe Road,201800 Shanghai,China [2]National Key Laboratory of Science and Technology on Tunable Laser,Harbin Institute of Technology,Xidazhi Road,150001 Harbin,China [3]School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Jungong Road,200093 Shanghai,China [4]Zhangjiang Laboratory,100,Haike Road,201204 Shanghai,China [5]Westlake Institute for Optoelectronics,311421 Fuyang,Hangzhou,China

出　　处：《PhotoniX》2024年第1期476-483,共8页智汇光学(英文)

基　　金：supported by the National Natural Science Foundation of China(NSFC)(62175245,62005066,61875045,62105345,62305220 and 92050202);Shanghai Sailing Program(21YF1453700 and 23YF1429300);Strategic Priority Research Program of Chinese Academy of Sciences(XDA25020302 and XDA25020104).

摘　　要：Extreme ultraviolet(EUV)light is difficult to focus due to strong absorption of most materials.Photon sieves(PS),rather than Fresnel zone plates(FZP),can focus EUV to smaller spot and suppress the higher orders of secondary maxima by several orders of magnitude.The number of pinholes used in PS is far more than that of transparent rings used in FZP,providing a great flexibility to manipulate structured focusing in EUV.In this work we investigate the Fermat-spiral PS to produce focused vortices with different topological charges.Experiment at the wavelength of 46.9 nm is carried out and multi-planar coherent diffractive imaging is used to retrieve the phase map of the focused EUV vortices.These results show the enormous potential of PS for manipulating EUV light.This study not only provides a compact,affordable substitute to focusing vortices where transmissive optics materials are unavailable,but also provides a route of converting various complex light manipulation ranging from visible light to EUV and soft x-ray.

关 键 词：Extreme ultraviolet focusing Orbital angular momentum Photon sieves Coherent diffraction imaing 

分 类 号：O43[机械工程—光学工程]