{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:UPVUJ72PJQCEGQLF3JJGLIOZ42","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":"0fcb4e73c94c38a4837abe04443a2f6416dd014cba910180c4cf62317dc6633b","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-08-19T08:14:07Z","title_canon_sha256":"aff31facaa14cb40d1fabc190b01257baa2cd207777c8f2b869b1357f86275ba"},"schema_version":"1.0","source":{"id":"1908.06635","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.06635","created_at":"2026-07-05T00:41:35Z"},{"alias_kind":"arxiv_version","alias_value":"1908.06635v2","created_at":"2026-07-05T00:41:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.06635","created_at":"2026-07-05T00:41:35Z"},{"alias_kind":"pith_short_12","alias_value":"UPVUJ72PJQCE","created_at":"2026-07-05T00:41:35Z"},{"alias_kind":"pith_short_16","alias_value":"UPVUJ72PJQCEGQLF","created_at":"2026-07-05T00:41:35Z"},{"alias_kind":"pith_short_8","alias_value":"UPVUJ72P","created_at":"2026-07-05T00:41:35Z"}],"graph_snapshots":[{"event_id":"sha256:92486759dd9e890f4775a7fa3e13f1fb2310f5df0a548a17373b76c67ab13386","target":"graph","created_at":"2026-07-05T00:41:35Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1908.06635/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Designing broadband metamaterial perfect absorbers is challenging due to the intrinsically narrow bandwidth of surface plasmon resonances. Here, the paper reports an ultra-broadband metamaterial absorber by using space filling Gosper curve. The optimized result shows an average absorptivity of 95.78% from 2.64 to 9.79 {\\mu}m across the entire mid-infrared region. Meanwhile, the absorber shows insensitivity to the polarization angle and the incident angle of the incident light. The underlying physical principles, used in our broadband absorber, involve a fractal geometry with multiple scales an","authors_text":"Alexander O. Govorov, Cuo Wu, Haining Ji, Jiang Wu, Jihua Zou, Le Chang, Peng Yu, Wen Du, Wenhao Wang, Xiaobin Niu, Xin Tong, Yongjun Huang, Zhiming Wang","cross_cats":["physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-08-19T08:14:07Z","title":"Broadband mid-infrared perfect absorber using fractal Gosper curve"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.06635","kind":"arxiv","version":2},"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":"sha256:9604e95405ccc090cf9567b321c6859c4fe8c69730f114414a9b4b515d8dfb76","target":"record","created_at":"2026-07-05T00:41:35Z","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":"0fcb4e73c94c38a4837abe04443a2f6416dd014cba910180c4cf62317dc6633b","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-08-19T08:14:07Z","title_canon_sha256":"aff31facaa14cb40d1fabc190b01257baa2cd207777c8f2b869b1357f86275ba"},"schema_version":"1.0","source":{"id":"1908.06635","kind":"arxiv","version":2}},"canonical_sha256":"a3eb44ff4f4c04434165da5265a1d9e6b7e17d4c8dedfa5469cd6f81bfa27353","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a3eb44ff4f4c04434165da5265a1d9e6b7e17d4c8dedfa5469cd6f81bfa27353","first_computed_at":"2026-07-05T00:41:35.455499Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:41:35.455499Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uWMtyjVHFjpEaD/BWaJ2i1k1/fHgXoUM6frdFpWqx+IIIAK4/4DA0qhMC20lkM9ZsgtB21GGd45uVmNTUqcVAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T00:41:35.455928Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.06635","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9604e95405ccc090cf9567b321c6859c4fe8c69730f114414a9b4b515d8dfb76","sha256:92486759dd9e890f4775a7fa3e13f1fb2310f5df0a548a17373b76c67ab13386"],"state_sha256":"00ca5cf947129c6ee258782f20ed8fae414f1d012277015ca1d16c20e75f769d"}