{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:7Z4M4HV7BAFHHXWLGUGDWBHZHY","short_pith_number":"pith:7Z4M4HV7","canonical_record":{"source":{"id":"1703.07032","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-03-21T02:54:52Z","cross_cats_sorted":[],"title_canon_sha256":"6282dc8001f18d610202d2016d189685813d04b3d779857c3be9bf689804ce63","abstract_canon_sha256":"7f88974faef8b92f184f2e50057ba17002aa0e8026d6c46b6d62b9f0e6dbed82"},"schema_version":"1.0"},"canonical_sha256":"fe78ce1ebf080a73decb350c3b04f93e30dc7060350b6375cdfe864b41eb37ef","source":{"kind":"arxiv","id":"1703.07032","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.07032","created_at":"2026-05-18T00:41:07Z"},{"alias_kind":"arxiv_version","alias_value":"1703.07032v2","created_at":"2026-05-18T00:41:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.07032","created_at":"2026-05-18T00:41:07Z"},{"alias_kind":"pith_short_12","alias_value":"7Z4M4HV7BAFH","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_16","alias_value":"7Z4M4HV7BAFHHXWL","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_8","alias_value":"7Z4M4HV7","created_at":"2026-05-18T12:31:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:7Z4M4HV7BAFHHXWLGUGDWBHZHY","target":"record","payload":{"canonical_record":{"source":{"id":"1703.07032","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-03-21T02:54:52Z","cross_cats_sorted":[],"title_canon_sha256":"6282dc8001f18d610202d2016d189685813d04b3d779857c3be9bf689804ce63","abstract_canon_sha256":"7f88974faef8b92f184f2e50057ba17002aa0e8026d6c46b6d62b9f0e6dbed82"},"schema_version":"1.0"},"canonical_sha256":"fe78ce1ebf080a73decb350c3b04f93e30dc7060350b6375cdfe864b41eb37ef","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:41:07.222742Z","signature_b64":"Jf10Efav0CKttH6pcEWYeSEzV+MmhFDMmTXOLkw9b+OXtvvsYJ/o9KdpHfwfQ7vm5aXcMNq7qbqG+izCt/O7BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fe78ce1ebf080a73decb350c3b04f93e30dc7060350b6375cdfe864b41eb37ef","last_reissued_at":"2026-05-18T00:41:07.222083Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:41:07.222083Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1703.07032","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:41:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FIXQd+8UBiMwhKOSnEBPr4FNU8o60LWWIilbzbg8vQl8mO64tRgNWqQJbpByf756Mq2nnwrqLfK9cjq9lEu/DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T08:24:24.951831Z"},"content_sha256":"28fa47468cafc1418560e92141c191816d1036de42ec47d2525e0962593f67f5","schema_version":"1.0","event_id":"sha256:28fa47468cafc1418560e92141c191816d1036de42ec47d2525e0962593f67f5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:7Z4M4HV7BAFHHXWLGUGDWBHZHY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Tunable Metamaterials Fabricated by Fiber Drawing","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Alessio Stefani, Alexander Argyros, Daniel Kemsley, James Cordi, Richard Lwin, Simon Fleming, Xiaoli Tang","submitted_at":"2017-03-21T02:54:52Z","abstract_excerpt":"We demonstrate a practical scalable approach to the fabrication of tunable metamaterials. Designed for THz wavelengths, the metamaterial is comprised of polyurethane filled with an array of indium wires using the well-established fiber drawing technique. Modification of the dimensions of the metamaterial provides tunability: by compressing the metamaterial we demonstrated a 50% plasma frequency shift using THz time domain spectroscopy. Releasing the compression allowed the metamaterial to return to its original dimensions and plasma frequency, demonstrating dynamic reversible tunability."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.07032","kind":"arxiv","version":2},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:41:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gWNH8/WjgfKTdiaKW6bpKrKk9gXYmAN0Xz5ev4kPjxVK6XRDvsJ2pFp5U3EetVw3xQJ0oTaVmIj3Q9gEUZJ7Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T08:24:24.952509Z"},"content_sha256":"ea6b9c980852c99ff8fa9a7fa6767f6fec9e97045cf163590be4c0b3ed33abaf","schema_version":"1.0","event_id":"sha256:ea6b9c980852c99ff8fa9a7fa6767f6fec9e97045cf163590be4c0b3ed33abaf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7Z4M4HV7BAFHHXWLGUGDWBHZHY/bundle.json","state_url":"https://pith.science/pith/7Z4M4HV7BAFHHXWLGUGDWBHZHY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7Z4M4HV7BAFHHXWLGUGDWBHZHY/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-26T08:24:24Z","links":{"resolver":"https://pith.science/pith/7Z4M4HV7BAFHHXWLGUGDWBHZHY","bundle":"https://pith.science/pith/7Z4M4HV7BAFHHXWLGUGDWBHZHY/bundle.json","state":"https://pith.science/pith/7Z4M4HV7BAFHHXWLGUGDWBHZHY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7Z4M4HV7BAFHHXWLGUGDWBHZHY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:7Z4M4HV7BAFHHXWLGUGDWBHZHY","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":"7f88974faef8b92f184f2e50057ba17002aa0e8026d6c46b6d62b9f0e6dbed82","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-03-21T02:54:52Z","title_canon_sha256":"6282dc8001f18d610202d2016d189685813d04b3d779857c3be9bf689804ce63"},"schema_version":"1.0","source":{"id":"1703.07032","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.07032","created_at":"2026-05-18T00:41:07Z"},{"alias_kind":"arxiv_version","alias_value":"1703.07032v2","created_at":"2026-05-18T00:41:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.07032","created_at":"2026-05-18T00:41:07Z"},{"alias_kind":"pith_short_12","alias_value":"7Z4M4HV7BAFH","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_16","alias_value":"7Z4M4HV7BAFHHXWL","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_8","alias_value":"7Z4M4HV7","created_at":"2026-05-18T12:31:05Z"}],"graph_snapshots":[{"event_id":"sha256:ea6b9c980852c99ff8fa9a7fa6767f6fec9e97045cf163590be4c0b3ed33abaf","target":"graph","created_at":"2026-05-18T00:41:07Z","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 demonstrate a practical scalable approach to the fabrication of tunable metamaterials. Designed for THz wavelengths, the metamaterial is comprised of polyurethane filled with an array of indium wires using the well-established fiber drawing technique. Modification of the dimensions of the metamaterial provides tunability: by compressing the metamaterial we demonstrated a 50% plasma frequency shift using THz time domain spectroscopy. Releasing the compression allowed the metamaterial to return to its original dimensions and plasma frequency, demonstrating dynamic reversible tunability.","authors_text":"Alessio Stefani, Alexander Argyros, Daniel Kemsley, James Cordi, Richard Lwin, Simon Fleming, Xiaoli Tang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-03-21T02:54:52Z","title":"Tunable Metamaterials Fabricated by Fiber Drawing"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.07032","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":"sha256:28fa47468cafc1418560e92141c191816d1036de42ec47d2525e0962593f67f5","target":"record","created_at":"2026-05-18T00:41:07Z","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":"7f88974faef8b92f184f2e50057ba17002aa0e8026d6c46b6d62b9f0e6dbed82","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2017-03-21T02:54:52Z","title_canon_sha256":"6282dc8001f18d610202d2016d189685813d04b3d779857c3be9bf689804ce63"},"schema_version":"1.0","source":{"id":"1703.07032","kind":"arxiv","version":2}},"canonical_sha256":"fe78ce1ebf080a73decb350c3b04f93e30dc7060350b6375cdfe864b41eb37ef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fe78ce1ebf080a73decb350c3b04f93e30dc7060350b6375cdfe864b41eb37ef","first_computed_at":"2026-05-18T00:41:07.222083Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:41:07.222083Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Jf10Efav0CKttH6pcEWYeSEzV+MmhFDMmTXOLkw9b+OXtvvsYJ/o9KdpHfwfQ7vm5aXcMNq7qbqG+izCt/O7BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:41:07.222742Z","signed_message":"canonical_sha256_bytes"},"source_id":"1703.07032","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:28fa47468cafc1418560e92141c191816d1036de42ec47d2525e0962593f67f5","sha256:ea6b9c980852c99ff8fa9a7fa6767f6fec9e97045cf163590be4c0b3ed33abaf"],"state_sha256":"9140e8d8cf9ff5a06526115ea924187fb47e96672fbaeab75ad264050f046f71"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Y4FhQ2DSfvAQXj/JHox+EIrHUCY8TjN0Xckh7h+u4C1LSr6Y9ZHrGNAlT1JF3lNWimCbEpWiTy2IKfwIWdR/Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T08:24:24.955885Z","bundle_sha256":"68384ef7d503ecb86f81d9bd4ada2e538ffa0a2f1cf0585576075e9de2af6afe"}}