{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:MW6WYZY7KUBTCIFE56WN6JMZDR","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"31f801ee01da56fa0be33447b62e11cf0f5ec74de963fe76ceeb96c69fc0a2f0","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-04-24T16:17:17Z","title_canon_sha256":"6eaa316b9fa0e54cb4f9a1b6f4806848c12d57d7f3858caefa5ee0605c092bbe"},"schema_version":"1.0","source":{"id":"1204.5422","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.5422","created_at":"2026-05-18T01:57:46Z"},{"alias_kind":"arxiv_version","alias_value":"1204.5422v4","created_at":"2026-05-18T01:57:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.5422","created_at":"2026-05-18T01:57:46Z"},{"alias_kind":"pith_short_12","alias_value":"MW6WYZY7KUBT","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"MW6WYZY7KUBTCIFE","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"MW6WYZY7","created_at":"2026-05-18T12:27:14Z"}],"graph_snapshots":[{"event_id":"sha256:20024ffd164fc6bfe3344c3256582746319f2b33c87dcade6dfaebd670cc0ee0","target":"graph","created_at":"2026-05-18T01:57:46Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"The design of nano-antennas is so far mainly inspired by radio-frequency technology. However, material properties and experimental settings need to be reconsidered at optical frequencies, which entails the need for alternative optimal antenna designs. Here a checkerboard-type, initially random array of gold cubes is subjected to evolutionary optimization. To illustrate the power of the approach we demonstrate that by optimizing the near-field intensity enhancement the evolutionary algorithm finds a new antenna geometry, essentially a split-ring/two-wire antenna hybrid which surpasses by far th","authors_text":"Bert Hecht, Markus Kiunke, Oleg Selig, Thorsten Feichtner","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-04-24T16:17:17Z","title":"Evolutionary optimization of optical antennas"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.5422","kind":"arxiv","version":4},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:249689c8c2ba8189d2bb71352d0781b607bf12fa9e597c63b52fc5f5a3454e5a","target":"record","created_at":"2026-05-18T01:57:46Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"31f801ee01da56fa0be33447b62e11cf0f5ec74de963fe76ceeb96c69fc0a2f0","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-04-24T16:17:17Z","title_canon_sha256":"6eaa316b9fa0e54cb4f9a1b6f4806848c12d57d7f3858caefa5ee0605c092bbe"},"schema_version":"1.0","source":{"id":"1204.5422","kind":"arxiv","version":4}},"canonical_sha256":"65bd6c671f55033120a4efacdf25991c626736a5377686d6277c6d862c4c9201","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"65bd6c671f55033120a4efacdf25991c626736a5377686d6277c6d862c4c9201","first_computed_at":"2026-05-18T01:57:46.676879Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:57:46.676879Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Rbtke2QpEuriHLVEcCVpGuhqDX3OM4KY3ds9Rc1Y1Z9nIqoJwwZWy4Own8YrnLmX8y1EAzDSBAkXZSx4OewGDg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:57:46.677630Z","signed_message":"canonical_sha256_bytes"},"source_id":"1204.5422","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:249689c8c2ba8189d2bb71352d0781b607bf12fa9e597c63b52fc5f5a3454e5a","sha256:20024ffd164fc6bfe3344c3256582746319f2b33c87dcade6dfaebd670cc0ee0"],"state_sha256":"e10305206413071590995f2f3b49bc0ced7545bb8c546c21cfa2e8d8d062ecf9"}