北京大学学报（自然科学版）2025，Vol.61Issue(4)：650-658,9.DOI:10.13209/j.0479-8023.2025.056
准随机点阵二维叉形光栅的设计与表征
Design and Characterization of Quasi-random-dots Two-dimensional Fork Gratings
摘要
Abstract
In order to suppress the high-order diffractions of the traditional two-dimensional fork gratings,a single optical element,named quasi-random-dots two-dimensional fork gratings(QTFGs),is proposed,which can realize single-order diffraction for planar structures.The key idea is to divide the traditional two-dimensional sinusoidal fork gratings into a large number of rectangular dots,and binarize these dots.Numerical simulations and experiments show that the quasi-random-dots two-dimensional fork gratings can effectively eliminate second-order and higher-order diffractions,and only retain zero-order and first-order diffractions.In addition,the effects of topological charge,wavelength,and rectangular dot size on diffraction characteristics were analyzed,and these analyses was confirmed that the output beam has a helical phase structure with multiple topological charges.关键词
衍射光学/光学涡旋/单级衍射/准正弦Key words
diffraction optics/optical vortices/single-order diffraction/quasi-sinusoidal引用本文复制引用
胡华奎,丁江涛,江海锋,吴卫锋,徐华结..准随机点阵二维叉形光栅的设计与表征[J].北京大学学报（自然科学版）,2025,61(4):650-658,9.基金项目
安徽省高校自然科学研究项目(CZ2024ZRZ07,CZ2024YJRC20,CZ2024ZRZ06)资助 （CZ2024ZRZ07,CZ2024YJRC20,CZ2024ZRZ06）
