{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:YENVRIJM74CFMPHK4OCWX77TXS","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":"9b64b2ddb54eea62171f26e401204decfee0a4f59e0ef485551d8a749f7d56a1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-08-22T12:00:34Z","title_canon_sha256":"57f0216f8d35c194b83a8ff4b16972d3938538402eaec08981714b9d8b9afa68"},"schema_version":"1.0","source":{"id":"1208.4482","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.4482","created_at":"2026-05-18T01:54:59Z"},{"alias_kind":"arxiv_version","alias_value":"1208.4482v1","created_at":"2026-05-18T01:54:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.4482","created_at":"2026-05-18T01:54:59Z"},{"alias_kind":"pith_short_12","alias_value":"YENVRIJM74CF","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_16","alias_value":"YENVRIJM74CFMPHK","created_at":"2026-05-18T12:27:27Z"},{"alias_kind":"pith_short_8","alias_value":"YENVRIJM","created_at":"2026-05-18T12:27:27Z"}],"graph_snapshots":[{"event_id":"sha256:dafd73624ec635897b96753663f4f48673e4a4e7eaffea54933bd592ff6c755a","target":"graph","created_at":"2026-05-18T01:54:59Z","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":"We directly observe longitudinal electromagnetic fields in focused freely propagating terahertz beams of radial and linear polarization. In accordance with theory, the longitudinal fields are phase shifted by a value of pi/2 with respect to the transverse field components. This behavior is found for all frequency components of single cycle THz radiation pulses. Additionally we show that the longitudinal field of a radially polarized THz beam has a smaller spot size as compared to the transverse field of a linearly polarized beam, that is focused under the same conditions.","authors_text":"H. Schneider, M. Helm, M. Mittendorff, R. Hubrich, S. Winnerl","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-08-22T12:00:34Z","title":"Universal phase relation between longitudinal and transverse fields observed in focused terahertz beams"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.4482","kind":"arxiv","version":1},"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":"sha256:327f7a6dbad22a789855698468d3b8b50f1373f3a224c09ec6b2b0c0e9643543","target":"record","created_at":"2026-05-18T01:54:59Z","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":"9b64b2ddb54eea62171f26e401204decfee0a4f59e0ef485551d8a749f7d56a1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-08-22T12:00:34Z","title_canon_sha256":"57f0216f8d35c194b83a8ff4b16972d3938538402eaec08981714b9d8b9afa68"},"schema_version":"1.0","source":{"id":"1208.4482","kind":"arxiv","version":1}},"canonical_sha256":"c11b58a12cff04563ceae3856bfff3bc9ee821999d426d3e56908d12b91cbc74","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c11b58a12cff04563ceae3856bfff3bc9ee821999d426d3e56908d12b91cbc74","first_computed_at":"2026-05-18T01:54:59.735859Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:54:59.735859Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gIME/Fmvo9wfl1Qe3zddHF7xNi9LbF3d8+tyOHN5c4RpUeRM05LjO8JbCmb8/hgZlC7i9T4cLPJuuWHkXEGNBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:54:59.736866Z","signed_message":"canonical_sha256_bytes"},"source_id":"1208.4482","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:327f7a6dbad22a789855698468d3b8b50f1373f3a224c09ec6b2b0c0e9643543","sha256:dafd73624ec635897b96753663f4f48673e4a4e7eaffea54933bd592ff6c755a"],"state_sha256":"87a20c5892360d7be36b48ffcf5c453458f30d7adc54a3fb142f5350dc174e18"}