Optical edge-to-screw singularity state conversions  

作　　者：HAOLIN LIN JUNHUI JIA GUOHUA LIU YANWEN HU ZHEN LI ZHENQIANG CHEN SHENHE FU 

机构地区：[1]Department of Optoelectronic Engineering,Jinan University,Guangzhou 510632,China [2]Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications,Guangzhou 510632,China [3]Guangdong Provincial Engineering Research Center of Crystal and Laser Technology,Guangzhou 510632,China

出　　处：《Photonics Research》2024年第8期1689-1695,共7页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(12304358,12374306,62175091);Guangzhou Science and Technology Program(202201020061);Fundamental Research Funds for the Central Universities(21623331)。

摘　　要：Optical singularity states,which significantly affect propagation properties of light in free space or optical medium,can be geometrically classified into screw and edge types.These different types of singularity states do not exhibit direct connection,being decoupled from each other in the absence of external perturbations.Here we demonstrate a novel optical process in which a higher-order edge singularity state initially nested in the propagating Gaussian light field gradually involves into a screw singularity with a new-born topological charge determined by order of the edge state.The considered edge state comprises an equal superposition of oppositely charged vortex and antivortex modes.We theoretically and experimentally realize this edge-to-screw conversion process by introducing intrinsic vortex–antivortex interaction.We also present a geometrical representation for mapping this dynamical process,based on the higher-order orbital Poincarésphere.Within this framework,the edge-to-screw conversion is explained by a mapping of state evolution from the equator to the north or south pole of the Poincarésphere.Our demonstration provides a novel approach for manipulating singularity state by the intrinsic vortex–antivortex interactions.The presented phenomenon can be also generalized to other wave systems such as matter wave,water wave,and acoustic wave.

关 键 词：INTERACTION POINCARÉ WAVE 

分 类 号：O43[机械工程—光学工程]