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Spin and orbital angular momentum (SAM and OAM) provide rich degrees of freedom for advanced light field control. While SAM\u2010 and OAM\u2010multiplexing metasurface holograms have been realized in the linear optical regime, their performance is hindered by a low signal\u2010to\u2010noise ratio stemming from residual light mode conversion. Nonlinear OAM holography has recently been demonstrated; however, its practicality remains limited by reliance on bulky nonlinear optical crystals that exhibit only intrinsic spin\u2013orbit interaction (SOI). Here, we introduce nonlinear SOI holography via second harmonic generation on optical metasurfaces composed of gold plasmonic meta\u2010atoms. By controlling the local rotational symmetry and topological charges, these metasurface holograms can fully harness optical SOI through both intrinsic and extrinsic angular momentum mode conversions. Information hidden in second harmonic holographic images can only be reconstructed from the spin\u2013orbit tomography of the fundamental waves, ensuring high\u2010security nonlinear optical encryption. The proposed approach offers promising applications in optical communications, optical information processing, high\u2010dimensional optical storage, and so on.<\/jats:p>","DOI":"10.1002\/adma.202521229","type":"journal-article","created":{"date-parts":[[2026,1,3]],"date-time":"2026-01-03T06:12:28Z","timestamp":1767420748000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Spin\u2013Orbit Interaction Enabled Nonlinear Metasurface Holography"],"prefix":"10.1002","volume":"38","author":[{"given":"Zixian","family":"Hu","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering Southern University of Science and Technology  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kingfai","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Southern University of Science and Technology  Shenzhen 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