{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:SNZAB4VSQBKRHKQBXZWP2XAUMJ","short_pith_number":"pith:SNZAB4VS","canonical_record":{"source":{"id":"1205.1620","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-05-08T08:00:03Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"dc35bc28b6c13e6731a56ad8140ed4725114c4bbf4afd23f30836797e5b61750","abstract_canon_sha256":"e45289864fc0e24e2c13f650143143f60f3343080bac47cfc1ead96df96e8887"},"schema_version":"1.0"},"canonical_sha256":"937200f2b2805513aa01be6cfd5c14627770162b68bddf6cb9d9e5decac8dd1f","source":{"kind":"arxiv","id":"1205.1620","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1205.1620","created_at":"2026-05-18T01:57:36Z"},{"alias_kind":"arxiv_version","alias_value":"1205.1620v2","created_at":"2026-05-18T01:57:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1205.1620","created_at":"2026-05-18T01:57:36Z"},{"alias_kind":"pith_short_12","alias_value":"SNZAB4VSQBKR","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_16","alias_value":"SNZAB4VSQBKRHKQB","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_8","alias_value":"SNZAB4VS","created_at":"2026-05-18T12:27:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:SNZAB4VSQBKRHKQBXZWP2XAUMJ","target":"record","payload":{"canonical_record":{"source":{"id":"1205.1620","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-05-08T08:00:03Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"dc35bc28b6c13e6731a56ad8140ed4725114c4bbf4afd23f30836797e5b61750","abstract_canon_sha256":"e45289864fc0e24e2c13f650143143f60f3343080bac47cfc1ead96df96e8887"},"schema_version":"1.0"},"canonical_sha256":"937200f2b2805513aa01be6cfd5c14627770162b68bddf6cb9d9e5decac8dd1f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:57:36.787328Z","signature_b64":"GjXiM1T72WBy0ocyyeub4Yv58MIe8RnhgFlWANwyhOU/RDlaQ9fX+zI83zyOLev+CSNQb8BXXpT0insC8Rc1DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"937200f2b2805513aa01be6cfd5c14627770162b68bddf6cb9d9e5decac8dd1f","last_reissued_at":"2026-05-18T01:57:36.786579Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:57:36.786579Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1205.1620","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":"2026-05-18T01:57:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eoXRP39aJLCZMB2a5ELC8lmrDbR/GOyCLzOCzPh/8/Wqijqf1sCKURpurJ4TgOOlc5sMtVqs3YjgjlyVSrkhAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T11:25:09.746925Z"},"content_sha256":"1c6b0d12965ec3ee2bdd126c37e50bf0016bda31bb92d6e45175a70dd922c13b","schema_version":"1.0","event_id":"sha256:1c6b0d12965ec3ee2bdd126c37e50bf0016bda31bb92d6e45175a70dd922c13b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:SNZAB4VSQBKRHKQBXZWP2XAUMJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Analytical Study of Sub-Wavelength Imaging by Uniaxial Epsilon-Near-Zero Metamaterial Slabs","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"physics.optics","authors_text":"Andrea Al\\'u, Giuseppe Castaldi, Nader Engheta, Silvio Savoia, Vincenzo Galdi","submitted_at":"2012-05-08T08:00:03Z","abstract_excerpt":"We discuss the imaging properties of uniaxial epsilon-near-zero metamaterial slabs with possibly tilted optical axis, analyzing their sub-wavelength focusing properties as a function of the design parameters. We derive in closed analytical form the associated two-dimensional Green's function in terms of special cylindrical functions. For the near-field parameter ranges of interest, we are also able to derive a small-argument approximation in terms of simpler analytical functions. Our results, validated and calibrated against a full-wave reference solution, expand the analytical tools available"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1205.1620","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":"2026-05-18T01:57:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WWSFRM7nkCEGOUzGM6NWZW2vPZ/0FyFRtNkJ6Yuttr4i1b8Tmun6RMVvc1UZJBeJ3wOFfSmxVT+q3oCuyKObDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T11:25:09.747328Z"},"content_sha256":"bb9776d8059d72dfb411804acc8aa64e77397639ab55f0b4461a183507f47c9a","schema_version":"1.0","event_id":"sha256:bb9776d8059d72dfb411804acc8aa64e77397639ab55f0b4461a183507f47c9a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SNZAB4VSQBKRHKQBXZWP2XAUMJ/bundle.json","state_url":"https://pith.science/pith/SNZAB4VSQBKRHKQBXZWP2XAUMJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SNZAB4VSQBKRHKQBXZWP2XAUMJ/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":"2026-05-31T11:25:09Z","links":{"resolver":"https://pith.science/pith/SNZAB4VSQBKRHKQBXZWP2XAUMJ","bundle":"https://pith.science/pith/SNZAB4VSQBKRHKQBXZWP2XAUMJ/bundle.json","state":"https://pith.science/pith/SNZAB4VSQBKRHKQBXZWP2XAUMJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SNZAB4VSQBKRHKQBXZWP2XAUMJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:SNZAB4VSQBKRHKQBXZWP2XAUMJ","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":"e45289864fc0e24e2c13f650143143f60f3343080bac47cfc1ead96df96e8887","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-05-08T08:00:03Z","title_canon_sha256":"dc35bc28b6c13e6731a56ad8140ed4725114c4bbf4afd23f30836797e5b61750"},"schema_version":"1.0","source":{"id":"1205.1620","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1205.1620","created_at":"2026-05-18T01:57:36Z"},{"alias_kind":"arxiv_version","alias_value":"1205.1620v2","created_at":"2026-05-18T01:57:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1205.1620","created_at":"2026-05-18T01:57:36Z"},{"alias_kind":"pith_short_12","alias_value":"SNZAB4VSQBKR","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_16","alias_value":"SNZAB4VSQBKRHKQB","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_8","alias_value":"SNZAB4VS","created_at":"2026-05-18T12:27:20Z"}],"graph_snapshots":[{"event_id":"sha256:bb9776d8059d72dfb411804acc8aa64e77397639ab55f0b4461a183507f47c9a","target":"graph","created_at":"2026-05-18T01:57:36Z","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 discuss the imaging properties of uniaxial epsilon-near-zero metamaterial slabs with possibly tilted optical axis, analyzing their sub-wavelength focusing properties as a function of the design parameters. We derive in closed analytical form the associated two-dimensional Green's function in terms of special cylindrical functions. For the near-field parameter ranges of interest, we are also able to derive a small-argument approximation in terms of simpler analytical functions. Our results, validated and calibrated against a full-wave reference solution, expand the analytical tools available","authors_text":"Andrea Al\\'u, Giuseppe Castaldi, Nader Engheta, Silvio Savoia, Vincenzo Galdi","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-05-08T08:00:03Z","title":"Analytical Study of Sub-Wavelength Imaging by Uniaxial Epsilon-Near-Zero Metamaterial Slabs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1205.1620","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":"sha256:1c6b0d12965ec3ee2bdd126c37e50bf0016bda31bb92d6e45175a70dd922c13b","target":"record","created_at":"2026-05-18T01:57:36Z","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":"e45289864fc0e24e2c13f650143143f60f3343080bac47cfc1ead96df96e8887","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-05-08T08:00:03Z","title_canon_sha256":"dc35bc28b6c13e6731a56ad8140ed4725114c4bbf4afd23f30836797e5b61750"},"schema_version":"1.0","source":{"id":"1205.1620","kind":"arxiv","version":2}},"canonical_sha256":"937200f2b2805513aa01be6cfd5c14627770162b68bddf6cb9d9e5decac8dd1f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"937200f2b2805513aa01be6cfd5c14627770162b68bddf6cb9d9e5decac8dd1f","first_computed_at":"2026-05-18T01:57:36.786579Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:57:36.786579Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GjXiM1T72WBy0ocyyeub4Yv58MIe8RnhgFlWANwyhOU/RDlaQ9fX+zI83zyOLev+CSNQb8BXXpT0insC8Rc1DA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:57:36.787328Z","signed_message":"canonical_sha256_bytes"},"source_id":"1205.1620","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1c6b0d12965ec3ee2bdd126c37e50bf0016bda31bb92d6e45175a70dd922c13b","sha256:bb9776d8059d72dfb411804acc8aa64e77397639ab55f0b4461a183507f47c9a"],"state_sha256":"25e4dd9cea192f3758f2c08e60bcd531b2a8cbb404756b4f68c66b118fa2d8a3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HJxhP/EAghwYo3VNjFNrGuEIR8MwYnlwa25Ee4VtaU1o6Dy2vU74acl/xaJ3HZUcNhu6+Z9Bo6Bxenz9+N1NAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T11:25:09.750780Z","bundle_sha256":"2edd5a00364d4238c1278f9e8011ec5e9fe1cc15bc8f16a52252f19837377bc1"}}