{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2016:UEEMXN2IAIRBV2XNGKE5XJ64MX","short_pith_number":"pith:UEEMXN2I","schema_version":"1.0","canonical_sha256":"a108cbb74802221aeaed3289dba7dc65e476a1f4f3433f0663cfb56358a2910b","source":{"kind":"arxiv","id":"1605.00831","version":1},"attestation_state":"computed","paper":{"title":"Geometric Metasurface Fork Gratings for Vortex Beam Generation and Manipulation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Guixin Li, Kok Wai Cheah, Shuang Zhang, Shumei Chen, Yuan Cai","submitted_at":"2016-05-03T10:53:17Z","abstract_excerpt":"In recent years, optical vortex beams possessing orbital angular momentum have caught much attention due to their potential for high capacity optical communications. This capability arises from the unbounded topological charges of orbital angular momentum (OAM) that provides infinite freedoms for encoding information. The two most common approaches for generating vortex beams are through fork diffraction gratings and spiral phase plates. While realization of conventional spiral phase plate requires complicated 3D fabrication, the emerging field of metasurfaces has provided a planar and facile "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1605.00831","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-05-03T10:53:17Z","cross_cats_sorted":[],"title_canon_sha256":"3884a439107b4f1f960acaa839d75794b5d95ec223dffe92758c8a6d7019820b","abstract_canon_sha256":"f743fa3ec85bcb580faedb757c46c1f1d48f956ec7510fc42bd3310d3d2ef06e"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:15:47.928126Z","signature_b64":"besngE3+8dxuOX7fZp9wSYKzf3mNzUheFjELjGuFYLEEHKbCnLXyRb9Sl3dKXnSCu1UDXsU93QEp33YyaFeFCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a108cbb74802221aeaed3289dba7dc65e476a1f4f3433f0663cfb56358a2910b","last_reissued_at":"2026-05-18T01:15:47.927689Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:15:47.927689Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Geometric Metasurface Fork Gratings for Vortex Beam Generation and Manipulation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Guixin Li, Kok Wai Cheah, Shuang Zhang, Shumei Chen, Yuan Cai","submitted_at":"2016-05-03T10:53:17Z","abstract_excerpt":"In recent years, optical vortex beams possessing orbital angular momentum have caught much attention due to their potential for high capacity optical communications. This capability arises from the unbounded topological charges of orbital angular momentum (OAM) that provides infinite freedoms for encoding information. The two most common approaches for generating vortex beams are through fork diffraction gratings and spiral phase plates. While realization of conventional spiral phase plate requires complicated 3D fabrication, the emerging field of metasurfaces has provided a planar and facile "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.00831","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1605.00831","created_at":"2026-05-18T01:15:47.927750+00:00"},{"alias_kind":"arxiv_version","alias_value":"1605.00831v1","created_at":"2026-05-18T01:15:47.927750+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.00831","created_at":"2026-05-18T01:15:47.927750+00:00"},{"alias_kind":"pith_short_12","alias_value":"UEEMXN2IAIRB","created_at":"2026-05-18T12:30:46.583412+00:00"},{"alias_kind":"pith_short_16","alias_value":"UEEMXN2IAIRBV2XN","created_at":"2026-05-18T12:30:46.583412+00:00"},{"alias_kind":"pith_short_8","alias_value":"UEEMXN2I","created_at":"2026-05-18T12:30:46.583412+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/UEEMXN2IAIRBV2XNGKE5XJ64MX","json":"https://pith.science/pith/UEEMXN2IAIRBV2XNGKE5XJ64MX.json","graph_json":"https://pith.science/api/pith-number/UEEMXN2IAIRBV2XNGKE5XJ64MX/graph.json","events_json":"https://pith.science/api/pith-number/UEEMXN2IAIRBV2XNGKE5XJ64MX/events.json","paper":"https://pith.science/paper/UEEMXN2I"},"agent_actions":{"view_html":"https://pith.science/pith/UEEMXN2IAIRBV2XNGKE5XJ64MX","download_json":"https://pith.science/pith/UEEMXN2IAIRBV2XNGKE5XJ64MX.json","view_paper":"https://pith.science/paper/UEEMXN2I","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1605.00831&json=true","fetch_graph":"https://pith.science/api/pith-number/UEEMXN2IAIRBV2XNGKE5XJ64MX/graph.json","fetch_events":"https://pith.science/api/pith-number/UEEMXN2IAIRBV2XNGKE5XJ64MX/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/UEEMXN2IAIRBV2XNGKE5XJ64MX/action/timestamp_anchor","attest_storage":"https://pith.science/pith/UEEMXN2IAIRBV2XNGKE5XJ64MX/action/storage_attestation","attest_author":"https://pith.science/pith/UEEMXN2IAIRBV2XNGKE5XJ64MX/action/author_attestation","sign_citation":"https://pith.science/pith/UEEMXN2IAIRBV2XNGKE5XJ64MX/action/citation_signature","submit_replication":"https://pith.science/pith/UEEMXN2IAIRBV2XNGKE5XJ64MX/action/replication_record"}},"created_at":"2026-05-18T01:15:47.927750+00:00","updated_at":"2026-05-18T01:15:47.927750+00:00"}