{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:C63EAZK7QA6OAFJXBKVFCLLLHE","short_pith_number":"pith:C63EAZK7","canonical_record":{"source":{"id":"2101.05582","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.optics","submitted_at":"2021-01-14T13:24:25Z","cross_cats_sorted":[],"title_canon_sha256":"473b250c7dea53cdbbfc08c575ea09b684f2e2ff2085ff38cdb88e4f3caf3f69","abstract_canon_sha256":"1493f881d5aca5875db830e0638918a37d998fc9c80913878679ee29100c9d18"},"schema_version":"1.0"},"canonical_sha256":"17b640655f803ce015370aaa512d6b3915436aeb3b6c93746a0b6403ea0aa2d9","source":{"kind":"arxiv","id":"2101.05582","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.05582","created_at":"2026-07-05T02:48:20Z"},{"alias_kind":"arxiv_version","alias_value":"2101.05582v2","created_at":"2026-07-05T02:48:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.05582","created_at":"2026-07-05T02:48:20Z"},{"alias_kind":"pith_short_12","alias_value":"C63EAZK7QA6O","created_at":"2026-07-05T02:48:20Z"},{"alias_kind":"pith_short_16","alias_value":"C63EAZK7QA6OAFJX","created_at":"2026-07-05T02:48:20Z"},{"alias_kind":"pith_short_8","alias_value":"C63EAZK7","created_at":"2026-07-05T02:48:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:C63EAZK7QA6OAFJXBKVFCLLLHE","target":"record","payload":{"canonical_record":{"source":{"id":"2101.05582","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.optics","submitted_at":"2021-01-14T13:24:25Z","cross_cats_sorted":[],"title_canon_sha256":"473b250c7dea53cdbbfc08c575ea09b684f2e2ff2085ff38cdb88e4f3caf3f69","abstract_canon_sha256":"1493f881d5aca5875db830e0638918a37d998fc9c80913878679ee29100c9d18"},"schema_version":"1.0"},"canonical_sha256":"17b640655f803ce015370aaa512d6b3915436aeb3b6c93746a0b6403ea0aa2d9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:48:20.695020Z","signature_b64":"FTJrePHqBfyNTX2SujwJCSjGZPB8W8b3z+Cn9wcF4j/VaeUvX/ONcIPblyJSs4Qk3QL5BoFVtS1zlGOMCWa8Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"17b640655f803ce015370aaa512d6b3915436aeb3b6c93746a0b6403ea0aa2d9","last_reissued_at":"2026-07-05T02:48:20.694643Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:48:20.694643Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2101.05582","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":"2026-07-05T02:48:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"81+pamgU9NgZJRGBK8Xg6W+cb1Osc+UQ6ETeRXboJtICAUH6EVEPbVRpjQZaw+1Ty0ToyBQUGXoErDWo/Mx/BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-24T20:04:38.817832Z"},"content_sha256":"1f5ecee484ae82ea63a3c0087f0be9de3f32be464215a32e2f20d44f8acc433e","schema_version":"1.0","event_id":"sha256:1f5ecee484ae82ea63a3c0087f0be9de3f32be464215a32e2f20d44f8acc433e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:C63EAZK7QA6OAFJXBKVFCLLLHE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A FEM enhanced Transfer Matrix method for optical grating design","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Clara Zaccaria, Lorenzo Pavesi, Mattia Mancinelli","submitted_at":"2021-01-14T13:24:25Z","abstract_excerpt":"A method to design gratings in integrated photonics, is presented. The method is based on a transfer matrix formalism enhanced by Finite Element Method (FEM) parameter calculations. The main advantages of the proposed technique are the easy of use, the fast optimization time and the versatility of the approach. Few examples of optimized gratings to obtain various scattered light field profiles for different applications are presented: a double-Gaussian profile, a flat top square profile, a spot profile on a chip surface, profiles suited to get efficient and selective coupling to single mode an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.05582","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2101.05582/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T02:48:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xAnPFRm7g1QeclG4oOSWAme9gKjYmW95/3mfYcIc3aCwlOrlWoVPzZdpJnMGlbiRsqR3gTP40SZHCSvCgEQ2AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-24T20:04:38.818218Z"},"content_sha256":"85aa8cf171877ea55807b3814646e350aa49b992c657c21b233a80411ce14148","schema_version":"1.0","event_id":"sha256:85aa8cf171877ea55807b3814646e350aa49b992c657c21b233a80411ce14148"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/C63EAZK7QA6OAFJXBKVFCLLLHE/bundle.json","state_url":"https://pith.science/pith/C63EAZK7QA6OAFJXBKVFCLLLHE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/C63EAZK7QA6OAFJXBKVFCLLLHE/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":"2026-07-24T20:04:38Z","links":{"resolver":"https://pith.science/pith/C63EAZK7QA6OAFJXBKVFCLLLHE","bundle":"https://pith.science/pith/C63EAZK7QA6OAFJXBKVFCLLLHE/bundle.json","state":"https://pith.science/pith/C63EAZK7QA6OAFJXBKVFCLLLHE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/C63EAZK7QA6OAFJXBKVFCLLLHE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:C63EAZK7QA6OAFJXBKVFCLLLHE","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":"1493f881d5aca5875db830e0638918a37d998fc9c80913878679ee29100c9d18","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.optics","submitted_at":"2021-01-14T13:24:25Z","title_canon_sha256":"473b250c7dea53cdbbfc08c575ea09b684f2e2ff2085ff38cdb88e4f3caf3f69"},"schema_version":"1.0","source":{"id":"2101.05582","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.05582","created_at":"2026-07-05T02:48:20Z"},{"alias_kind":"arxiv_version","alias_value":"2101.05582v2","created_at":"2026-07-05T02:48:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.05582","created_at":"2026-07-05T02:48:20Z"},{"alias_kind":"pith_short_12","alias_value":"C63EAZK7QA6O","created_at":"2026-07-05T02:48:20Z"},{"alias_kind":"pith_short_16","alias_value":"C63EAZK7QA6OAFJX","created_at":"2026-07-05T02:48:20Z"},{"alias_kind":"pith_short_8","alias_value":"C63EAZK7","created_at":"2026-07-05T02:48:20Z"}],"graph_snapshots":[{"event_id":"sha256:85aa8cf171877ea55807b3814646e350aa49b992c657c21b233a80411ce14148","target":"graph","created_at":"2026-07-05T02:48:20Z","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/2101.05582/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A method to design gratings in integrated photonics, is presented. The method is based on a transfer matrix formalism enhanced by Finite Element Method (FEM) parameter calculations. The main advantages of the proposed technique are the easy of use, the fast optimization time and the versatility of the approach. Few examples of optimized gratings to obtain various scattered light field profiles for different applications are presented: a double-Gaussian profile, a flat top square profile, a spot profile on a chip surface, profiles suited to get efficient and selective coupling to single mode an","authors_text":"Clara Zaccaria, Lorenzo Pavesi, Mattia Mancinelli","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.optics","submitted_at":"2021-01-14T13:24:25Z","title":"A FEM enhanced Transfer Matrix method for optical grating design"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.05582","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":"sha256:1f5ecee484ae82ea63a3c0087f0be9de3f32be464215a32e2f20d44f8acc433e","target":"record","created_at":"2026-07-05T02:48:20Z","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":"1493f881d5aca5875db830e0638918a37d998fc9c80913878679ee29100c9d18","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.optics","submitted_at":"2021-01-14T13:24:25Z","title_canon_sha256":"473b250c7dea53cdbbfc08c575ea09b684f2e2ff2085ff38cdb88e4f3caf3f69"},"schema_version":"1.0","source":{"id":"2101.05582","kind":"arxiv","version":2}},"canonical_sha256":"17b640655f803ce015370aaa512d6b3915436aeb3b6c93746a0b6403ea0aa2d9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"17b640655f803ce015370aaa512d6b3915436aeb3b6c93746a0b6403ea0aa2d9","first_computed_at":"2026-07-05T02:48:20.694643Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:48:20.694643Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FTJrePHqBfyNTX2SujwJCSjGZPB8W8b3z+Cn9wcF4j/VaeUvX/ONcIPblyJSs4Qk3QL5BoFVtS1zlGOMCWa8Dw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:48:20.695020Z","signed_message":"canonical_sha256_bytes"},"source_id":"2101.05582","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1f5ecee484ae82ea63a3c0087f0be9de3f32be464215a32e2f20d44f8acc433e","sha256:85aa8cf171877ea55807b3814646e350aa49b992c657c21b233a80411ce14148"],"state_sha256":"7f33704f41130a433647f4eabf3f3b99274ac26bc33fee1c3e3a305b281a2483"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3BgZBgE4jVfjOhUNjr8aEuD87tYAzu/w53Zi4lbmHXaHFw1Adyxli3IHqGWEGy7vioz7wB2t+oG2bvZR2pnZDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-24T20:04:38.820380Z","bundle_sha256":"4249b4ab4c54e57aab77fad3e6b06ea04c347c71589a5cb470b1292a042af72a"}}