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    "story_id": "mp-2026-08-16-027",
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    "headline": "A 46-Nanometer Crystal Switched the Light's Twist",
    "slug": "a-46-nanometer-crystal-switched-the-light-s-twist",
    "dek": "Crystal-engineered 3R-MoS2 switched second-harmonic vortex beams between opposite orbital-angular-momentum states in one ultrathin device.",
    "summary": "Crystal-engineered 3R-MoS2 switched second-harmonic vortex beams between opposite orbital-angular-momentum states in one ultrathin device.",
    "body_text": "Spatially controlling the local orientation of a 46-nanometer rhombohedrally stacked molybdenum-disulfide crystal imprinted a nonlinear geometric phase on generated second-harmonic light. The monolithic structure switched between Hermite-Gauss-like and Laguerre-Gaussian vortex beams with opposite topological charges at sub-optical-cycle timing. The experiment advances nanoscale control of structured light for integrated photonics; it is not yet a complete communications or quantum-processing product.",
    "why_it_matters": "Crystal-engineered 3R-MoS2 switched second-harmonic vortex beams between opposite orbital-angular-momentum states in one ultrathin device.",
    "limitations": [
      "The experiment advances nanoscale control of structured light for integrated photonics; it is not yet a complete communications or quantum-processing product."
    ],
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    "first_published_at": "2026-08-16T09:00:00.000-04:00",
    "modified_at": "2026-08-16T15:43:36.912-04:00",
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        "text": "Crystal-engineered 3R-MoS2 switched second-harmonic vortex beams between opposite orbital-angular-momentum states in one ultrathin device.",
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        "qualification": "The experiment advances nanoscale control of structured light for integrated photonics; it is not yet a complete communications or quantum-processing product."
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    "source_ids": [
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    "tags": [
      "structured light",
      "van der Waals materials",
      "nanophotonics",
      "orbital angular momentum"
    ],
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    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-08-16-016",
      "title": "arXiv preprint 2608.13548",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2608.13548",
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      "published_at": "2026-08-13T13:58:28.000-04:00",
      "accessed_at": "2026-08-16T15:41:08.010-04:00",
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  "cite_this_report": {
    "title": "A 46-Nanometer Crystal Switched the Light's Twist",
    "publisher": "The Machine Press",
    "published_at": "2026-08-16T09:00:00.000-04:00",
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