{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:B27RRFEEJQQTHCEJQNKFUZCDUT","short_pith_number":"pith:B27RRFEE","canonical_record":{"source":{"id":"1102.0474","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2011-02-02T16:24:32Z","cross_cats_sorted":[],"title_canon_sha256":"2d64b281fa2c944af624915b365c5167de8f4b199401bb6d4e7dfc35ca22cd50","abstract_canon_sha256":"e14e255ff447e8845e568f49149cc84b2870445413de1fefd804b85c1056313a"},"schema_version":"1.0"},"canonical_sha256":"0ebf1894844c2133888983545a6443a4dde7d29510a7b95ae4cec4e294930326","source":{"kind":"arxiv","id":"1102.0474","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1102.0474","created_at":"2026-05-18T04:21:52Z"},{"alias_kind":"arxiv_version","alias_value":"1102.0474v1","created_at":"2026-05-18T04:21:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1102.0474","created_at":"2026-05-18T04:21:52Z"},{"alias_kind":"pith_short_12","alias_value":"B27RRFEEJQQT","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"B27RRFEEJQQTHCEJ","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"B27RRFEE","created_at":"2026-05-18T12:26:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:B27RRFEEJQQTHCEJQNKFUZCDUT","target":"record","payload":{"canonical_record":{"source":{"id":"1102.0474","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2011-02-02T16:24:32Z","cross_cats_sorted":[],"title_canon_sha256":"2d64b281fa2c944af624915b365c5167de8f4b199401bb6d4e7dfc35ca22cd50","abstract_canon_sha256":"e14e255ff447e8845e568f49149cc84b2870445413de1fefd804b85c1056313a"},"schema_version":"1.0"},"canonical_sha256":"0ebf1894844c2133888983545a6443a4dde7d29510a7b95ae4cec4e294930326","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:21:52.765309Z","signature_b64":"JK5hSECV1gkPDkV/CfGU6RHtfx+fDPFjMuamUuG/Svbrrpi/TmS112A1ffco5p/P7vnmQ2jS0SYYwJS1pIPcCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0ebf1894844c2133888983545a6443a4dde7d29510a7b95ae4cec4e294930326","last_reissued_at":"2026-05-18T04:21:52.764674Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:21:52.764674Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1102.0474","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:21:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pa08H04lF2N5e4Iz2s0158tHyoVl6ekrHZ40d069KdWQ7h2at/FdI4juLTvYirJj4l4RkhBo8Ok0JklCKoTYCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T09:01:30.136073Z"},"content_sha256":"997acd417072a72fc2cee212ac467e5d9a887d4d8531f27713685de4d4b80d20","schema_version":"1.0","event_id":"sha256:997acd417072a72fc2cee212ac467e5d9a887d4d8531f27713685de4d4b80d20"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:B27RRFEEJQQTHCEJQNKFUZCDUT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Inverse scattering of 2d photonic structures by layer-stripping","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Harald E. Krogstad, Johannes Skaar, Marte P. Hatlo Andresen","submitted_at":"2011-02-02T16:24:32Z","abstract_excerpt":"Design and reconstruction of 2d and 3d photonic structures are usually carried out by forward simulations combined with optimization or intuition. Reconstruction by means of layer-stripping has been applied in seismic processing as well as in design and characterization of 1d photonic structures such as fiber Bragg gratings. Layer-stripping is based on causality, where the earliest scattered light is used to recover the structure layer-by-layer.\n  Our set-up is a 2d layered nonmagnetic structure probed by plane polarized harmonic waves entering normal to the layers. It is assumed that the diel"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1102.0474","kind":"arxiv","version":1},"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":"2026-05-18T04:21:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DTB2wQNhinhs5Vh3z6Ur7A315Wlfz9yP1rzgvaegFH5kzLBOXee9sM62571scPh9GgZrIUiMMaqQqpJenfNcBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T09:01:30.136756Z"},"content_sha256":"390ce212ddffabc4df5aa4df9a8068b068cd2b767b8b10da3a34ae905b1703f5","schema_version":"1.0","event_id":"sha256:390ce212ddffabc4df5aa4df9a8068b068cd2b767b8b10da3a34ae905b1703f5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/B27RRFEEJQQTHCEJQNKFUZCDUT/bundle.json","state_url":"https://pith.science/pith/B27RRFEEJQQTHCEJQNKFUZCDUT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/B27RRFEEJQQTHCEJQNKFUZCDUT/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":"2026-06-07T09:01:30Z","links":{"resolver":"https://pith.science/pith/B27RRFEEJQQTHCEJQNKFUZCDUT","bundle":"https://pith.science/pith/B27RRFEEJQQTHCEJQNKFUZCDUT/bundle.json","state":"https://pith.science/pith/B27RRFEEJQQTHCEJQNKFUZCDUT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/B27RRFEEJQQTHCEJQNKFUZCDUT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:B27RRFEEJQQTHCEJQNKFUZCDUT","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":"e14e255ff447e8845e568f49149cc84b2870445413de1fefd804b85c1056313a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2011-02-02T16:24:32Z","title_canon_sha256":"2d64b281fa2c944af624915b365c5167de8f4b199401bb6d4e7dfc35ca22cd50"},"schema_version":"1.0","source":{"id":"1102.0474","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1102.0474","created_at":"2026-05-18T04:21:52Z"},{"alias_kind":"arxiv_version","alias_value":"1102.0474v1","created_at":"2026-05-18T04:21:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1102.0474","created_at":"2026-05-18T04:21:52Z"},{"alias_kind":"pith_short_12","alias_value":"B27RRFEEJQQT","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"B27RRFEEJQQTHCEJ","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"B27RRFEE","created_at":"2026-05-18T12:26:24Z"}],"graph_snapshots":[{"event_id":"sha256:390ce212ddffabc4df5aa4df9a8068b068cd2b767b8b10da3a34ae905b1703f5","target":"graph","created_at":"2026-05-18T04:21:52Z","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":"Design and reconstruction of 2d and 3d photonic structures are usually carried out by forward simulations combined with optimization or intuition. Reconstruction by means of layer-stripping has been applied in seismic processing as well as in design and characterization of 1d photonic structures such as fiber Bragg gratings. Layer-stripping is based on causality, where the earliest scattered light is used to recover the structure layer-by-layer.\n  Our set-up is a 2d layered nonmagnetic structure probed by plane polarized harmonic waves entering normal to the layers. It is assumed that the diel","authors_text":"Harald E. Krogstad, Johannes Skaar, Marte P. Hatlo Andresen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2011-02-02T16:24:32Z","title":"Inverse scattering of 2d photonic structures by layer-stripping"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1102.0474","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":"sha256:997acd417072a72fc2cee212ac467e5d9a887d4d8531f27713685de4d4b80d20","target":"record","created_at":"2026-05-18T04:21:52Z","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":"e14e255ff447e8845e568f49149cc84b2870445413de1fefd804b85c1056313a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2011-02-02T16:24:32Z","title_canon_sha256":"2d64b281fa2c944af624915b365c5167de8f4b199401bb6d4e7dfc35ca22cd50"},"schema_version":"1.0","source":{"id":"1102.0474","kind":"arxiv","version":1}},"canonical_sha256":"0ebf1894844c2133888983545a6443a4dde7d29510a7b95ae4cec4e294930326","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0ebf1894844c2133888983545a6443a4dde7d29510a7b95ae4cec4e294930326","first_computed_at":"2026-05-18T04:21:52.764674Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:21:52.764674Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JK5hSECV1gkPDkV/CfGU6RHtfx+fDPFjMuamUuG/Svbrrpi/TmS112A1ffco5p/P7vnmQ2jS0SYYwJS1pIPcCA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:21:52.765309Z","signed_message":"canonical_sha256_bytes"},"source_id":"1102.0474","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:997acd417072a72fc2cee212ac467e5d9a887d4d8531f27713685de4d4b80d20","sha256:390ce212ddffabc4df5aa4df9a8068b068cd2b767b8b10da3a34ae905b1703f5"],"state_sha256":"6486c623edcc8857f1eaff29c02a5c6f161ba1534b7d4412fc25e6b1f6d1eacf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1NLKgss6K1fUFQSBA/wQyM9cl5fkAqGjX8u0ykOoBhQT9GaKsTs/t7XHlgbamQSqkRp7hhmIMg7nJB3ckrMRBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T09:01:30.140193Z","bundle_sha256":"28040c683e168d33aa08dc153aa2493e69d3b3c391292fcd9eec0bb9f9408a7b"}}