{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T13:39:14Z","timestamp":1778679554832,"version":"3.51.4"},"reference-count":35,"publisher":"Optica Publishing Group","issue":"3","license":[{"start":{"date-parts":[[2026,2,3]],"date-time":"2026-02-03T00:00:00Z","timestamp":1770076800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR-OA"},{"start":{"date-parts":[[2026,2,3]],"date-time":"2026-02-03T00:00:00Z","timestamp":1770076800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Express"],"published-print":{"date-parts":[[2026,2,9]]},"abstract":"<jats:p>\n                    We present a theoretical and computational framework for metasurface mirrors that switch optical angular momentum as a function of wavelength. The approach is based on controlling the phase retardance and amplitude balance of anisotropic meta-atoms to create a sharp wavelength threshold, termed a\n                    <jats:italic toggle=\"yes\">spectral horizon<\/jats:italic>\n                    , where the reflected light reverses its spin and orbital angular momentum. The paper develops an operational definition of this spectral horizon, supported by analytical modeling, large-scale Monte Carlo validation, and full-field simulations of spatial intensity and phase profiles incorporating fabrication variability. The reference design, based on TiO\n                    <jats:sub>2<\/jats:sub>\n                    nanopillars operating near 1550 nm, exhibits a steep spectral transition, narrow switching bandwidth, and high efficiency that remain stable under realistic tolerances. These results support a passive and reproducible route to wavelength-selective angular momentum control with applications in wavelength-division multiplexing, quantum state routing, and spectrally encoded photonic logic. We focus on the formulation and statistical validation of a synthetic spectral horizon for angular momentum, which connects metasurface dispersion, device performance metrics, and fabrication tolerances in a unified framework.\n                  <\/jats:p>","DOI":"10.1364\/oe.586460","type":"journal-article","created":{"date-parts":[[2026,1,21]],"date-time":"2026-01-21T09:00:07Z","timestamp":1768986007000},"page":"5119","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Photonic spectral horizons for spin\u2013orbit conversion"],"prefix":"10.1364","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-3693-1971","authenticated-orcid":true,"given":"Netzer","family":"Moriya","sequence":"first","affiliation":[{"name":"siOnet \u2013 Applied Modeling Research"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"285","published-online":{"date-parts":[[2026,2,3]]},"reference":[{"key":"oe-34-3-5119-R1","doi-asserted-by":"publisher","first-page":"377","DOI":"10.1364\/OE.25.000377","type":"journal-article","volume":"25","author":"Devlin","year":"2017","journal-title":"Opt. 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