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Non-Hermitian control of confined optical skyrmions in microcavities formed by photonic spin-orbit coupling

查看全文 作　　者：XIAOXUAN [1]LUO;YIN [1]CAI;XIN [1]YUE;WEI [1]LIN;JINGPING [1]ZHU;YANPENG [1]ZHANG;FENG [1]LI 高影响力作者 机构地区：[1]Key Laboratory for Physical Electronics and Devices of the Ministry of Education&Shaanxi Key Laboratory of Information Photonic Technique,School of Electronic Science and Engineering,Faculty of Electronic and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China高影响力机构 出　　处：《Photonics Research》索引2023年第11卷第4期,共12页高影响力期刊 基　　金：National Natural Science Foundation of China(61890961,12074303,11804267,12174302,11904279,62177813);Shaanxi Key Science and Technology Innovation Team(2021TD-56)。 摘　　要：Optical skyrmions formed by photonic spin–orbit(SO)coupling are of significant interest in high-dimensional optical information processing.We report the formation mechanism and non-Hermitian properties of skyrmionlike states in a circular confinement potential with photonic SO coupling,which is preferably realized in a concave-planar microcavity system.We show that the effective photonic gauge field leads to two split manifolds of degenerate skyrmions whose spin textures can be controlled via the non-Hermitian properties by introducing circularly polarized gain and loss,exhibiting dramatically discrepant evolutions at the two sides of the exceptional point(EP).Furthermore,the lifetime degeneracy can be lifted by spatially inhomogeneous pumping according to the non-Hermitian mechanism,enabling the possibility for the skyrmion laser.By introducing shape asymmetry of the confinement potential,a double EP evolution can be achieved,which allows non-Hermitian control of the SO coupled states with higher degrees of freedom.These results open the way for the non-Hermitian control of photonic spin in confined systems,which would be of great significance for the fundamentals of advanced optical information processing. 关 键 词：coupling CONFINED circular
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