{
  "abstract": "Achieving near-unity nonlinear circular dichroism (CD) typically requires geometric symmetry breaking, making it challenging to combine helicity selectivity, resonant enhancement, and structural simplicity. We show that crystal orientation enables near-unity third-harmonic (TH) CD in highly symmetric resonant metasurfaces formed by a square lattice of circular holes in a cubic nonlinear material. Under circularly polarized excitation, strong near-field components of both helicities enabled by the rotational symmetry of the metasurface open two symmetry-allowed in-plane TH generation pathways. Crystal orientation controls their nonlinear coupling, selectively enabling destructive interference for one incident helicity. Our nonlinear temporal coupled-mode theory identifies the conditions for near-unity CD, reveals the distinct roles of pump and TH resonances, and explains the fourfold and eightfold crystal-orientation dependence. Across silicon, germanium, and diamond, we obtain resonantly enhanced TH CD exceeding 99% in the near-infrared, establishing crystal orientation as a design degree of freedom for nonlinear CD in highly symmetric metasurfaces.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Nano Letters (2026)",
  "arxiv": "2607.17600",
  "author_total": 5,
  "authors": [
    {
      "name": "Chi Wang"
    },
    {
      "name": "Dmitrii Gromyko"
    },
    {
      "name": "Polina Pantiukhina"
    },
    {
      "name": "Lin Wu"
    },
    {
      "name": "Kirill Koshelev"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ez1mwexmq7chj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.17600",
  "fulltext_url": null,
  "id": "ez1mwexmq7chj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.17600",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "2504|Metamaterials and Metasurfaces Applications"
    ]
  ],
  "openalex": "W7169874701",
  "pdf_url": "https://arxiv.org/pdf/2607.17600",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ez1mwexmq7chj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2607.17600",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.17600"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Crystal orientation enables near-unity nonlinear circular dichroism in resonant metasurfaces",
  "title_text": "Crystal orientation enables near-unity nonlinear circular dichroism in resonant metasurfaces",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/ez1mwexmq7chj",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1021/acs.nanolett.6c03853",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}