{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:MOVQATFQ252HJXDJBX4B4E3AZP","short_pith_number":"pith:MOVQATFQ","canonical_record":{"source":{"id":"2105.09841","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"physics.optics","submitted_at":"2021-05-20T15:38:57Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"b97ed1ba96bfcf9fb79fbda54212081563645a73605412cc64497b9c69e44dbb","abstract_canon_sha256":"4bde2a5705afe365aaba631e6bd0ee30def7f8b782f62df3cab4066b44d27559"},"schema_version":"1.0"},"canonical_sha256":"63ab004cb0d77474dc690df81e1360cbea17f7a1e98868ad79bf12a51aa9682b","source":{"kind":"arxiv","id":"2105.09841","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.09841","created_at":"2026-07-05T03:02:16Z"},{"alias_kind":"arxiv_version","alias_value":"2105.09841v3","created_at":"2026-07-05T03:02:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.09841","created_at":"2026-07-05T03:02:16Z"},{"alias_kind":"pith_short_12","alias_value":"MOVQATFQ252H","created_at":"2026-07-05T03:02:16Z"},{"alias_kind":"pith_short_16","alias_value":"MOVQATFQ252HJXDJ","created_at":"2026-07-05T03:02:16Z"},{"alias_kind":"pith_short_8","alias_value":"MOVQATFQ","created_at":"2026-07-05T03:02:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:MOVQATFQ252HJXDJBX4B4E3AZP","target":"record","payload":{"canonical_record":{"source":{"id":"2105.09841","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"physics.optics","submitted_at":"2021-05-20T15:38:57Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"b97ed1ba96bfcf9fb79fbda54212081563645a73605412cc64497b9c69e44dbb","abstract_canon_sha256":"4bde2a5705afe365aaba631e6bd0ee30def7f8b782f62df3cab4066b44d27559"},"schema_version":"1.0"},"canonical_sha256":"63ab004cb0d77474dc690df81e1360cbea17f7a1e98868ad79bf12a51aa9682b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:02:16.122693Z","signature_b64":"yGcoiPx94y8gorTJqg28CwEG4IhiKRWebq6KZ4XvofJZRXR0twTG+3F50ACmVVnJOOApgSiESpkH2lwVneWkCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"63ab004cb0d77474dc690df81e1360cbea17f7a1e98868ad79bf12a51aa9682b","last_reissued_at":"2026-07-05T03:02:16.122214Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:02:16.122214Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2105.09841","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:02:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t0u1qCDVG8mg1WN2ANnrVm2XWURKXLkky7eZjVYsPy+mV/9E/80kpydDs8AyI9H0CccjV0wQhKvXPuSFLShtBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T03:57:35.132656Z"},"content_sha256":"c2c404a1834d7b39e72be274ee64874a7d624e697d54fb6d874a876806c186c9","schema_version":"1.0","event_id":"sha256:c2c404a1834d7b39e72be274ee64874a7d624e697d54fb6d874a876806c186c9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:MOVQATFQ252HJXDJBX4B4E3AZP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"T Grating on Nano-Cavity Array based Refractive Index Sensor","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["physics.app-ph"],"primary_cat":"physics.optics","authors_text":"Md Asif Hossain Bhuiyan, Sajid Muhaimin Choudhury, Yasir Fatha Abed","submitted_at":"2021-05-20T15:38:57Z","abstract_excerpt":"We report a refractive index sensor comprising of unique T grating on top of periodic nano-cavities. The sensor has two resonant modes sensitive to different regions of the structure with low inter-region interference, hence allows simultaneous detection of two different analytes or more accurate detection of a single analyte. The sensor also provides a self-referencing feature for a broad range of refractive index, from 1.3 to 1.5. Using the FDTD method, the sensitivities of 801.7 nm/RIU and 1386.8 nm/RIU have been recorded for the two modes respectively. The versatility of the structure make"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.09841","kind":"arxiv","version":3},"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/2105.09841/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":"2026-07-05T03:02:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"62R7FGvQBYJTXfCMwFmAW2Oq+BLACfc11XgSqg1aQiAu7PWd1XvXpfy7jHXPzDr+eH0P2WXgA2u0JAtBNTXkDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T03:57:35.133189Z"},"content_sha256":"ddaea783ad0b95bd386a9a72790e03fa3cfb092208367835a869a2e63a84d3dd","schema_version":"1.0","event_id":"sha256:ddaea783ad0b95bd386a9a72790e03fa3cfb092208367835a869a2e63a84d3dd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MOVQATFQ252HJXDJBX4B4E3AZP/bundle.json","state_url":"https://pith.science/pith/MOVQATFQ252HJXDJBX4B4E3AZP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MOVQATFQ252HJXDJBX4B4E3AZP/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":"2026-08-22T03:57:35Z","links":{"resolver":"https://pith.science/pith/MOVQATFQ252HJXDJBX4B4E3AZP","bundle":"https://pith.science/pith/MOVQATFQ252HJXDJBX4B4E3AZP/bundle.json","state":"https://pith.science/pith/MOVQATFQ252HJXDJBX4B4E3AZP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MOVQATFQ252HJXDJBX4B4E3AZP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:MOVQATFQ252HJXDJBX4B4E3AZP","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":"4bde2a5705afe365aaba631e6bd0ee30def7f8b782f62df3cab4066b44d27559","cross_cats_sorted":["physics.app-ph"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"physics.optics","submitted_at":"2021-05-20T15:38:57Z","title_canon_sha256":"b97ed1ba96bfcf9fb79fbda54212081563645a73605412cc64497b9c69e44dbb"},"schema_version":"1.0","source":{"id":"2105.09841","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.09841","created_at":"2026-07-05T03:02:16Z"},{"alias_kind":"arxiv_version","alias_value":"2105.09841v3","created_at":"2026-07-05T03:02:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.09841","created_at":"2026-07-05T03:02:16Z"},{"alias_kind":"pith_short_12","alias_value":"MOVQATFQ252H","created_at":"2026-07-05T03:02:16Z"},{"alias_kind":"pith_short_16","alias_value":"MOVQATFQ252HJXDJ","created_at":"2026-07-05T03:02:16Z"},{"alias_kind":"pith_short_8","alias_value":"MOVQATFQ","created_at":"2026-07-05T03:02:16Z"}],"graph_snapshots":[{"event_id":"sha256:ddaea783ad0b95bd386a9a72790e03fa3cfb092208367835a869a2e63a84d3dd","target":"graph","created_at":"2026-07-05T03:02:16Z","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/2105.09841/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report a refractive index sensor comprising of unique T grating on top of periodic nano-cavities. The sensor has two resonant modes sensitive to different regions of the structure with low inter-region interference, hence allows simultaneous detection of two different analytes or more accurate detection of a single analyte. The sensor also provides a self-referencing feature for a broad range of refractive index, from 1.3 to 1.5. Using the FDTD method, the sensitivities of 801.7 nm/RIU and 1386.8 nm/RIU have been recorded for the two modes respectively. The versatility of the structure make","authors_text":"Md Asif Hossain Bhuiyan, Sajid Muhaimin Choudhury, Yasir Fatha Abed","cross_cats":["physics.app-ph"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"physics.optics","submitted_at":"2021-05-20T15:38:57Z","title":"T Grating on Nano-Cavity Array based Refractive Index Sensor"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.09841","kind":"arxiv","version":3},"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:c2c404a1834d7b39e72be274ee64874a7d624e697d54fb6d874a876806c186c9","target":"record","created_at":"2026-07-05T03:02:16Z","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":"4bde2a5705afe365aaba631e6bd0ee30def7f8b782f62df3cab4066b44d27559","cross_cats_sorted":["physics.app-ph"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"physics.optics","submitted_at":"2021-05-20T15:38:57Z","title_canon_sha256":"b97ed1ba96bfcf9fb79fbda54212081563645a73605412cc64497b9c69e44dbb"},"schema_version":"1.0","source":{"id":"2105.09841","kind":"arxiv","version":3}},"canonical_sha256":"63ab004cb0d77474dc690df81e1360cbea17f7a1e98868ad79bf12a51aa9682b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"63ab004cb0d77474dc690df81e1360cbea17f7a1e98868ad79bf12a51aa9682b","first_computed_at":"2026-07-05T03:02:16.122214Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:02:16.122214Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yGcoiPx94y8gorTJqg28CwEG4IhiKRWebq6KZ4XvofJZRXR0twTG+3F50ACmVVnJOOApgSiESpkH2lwVneWkCA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:02:16.122693Z","signed_message":"canonical_sha256_bytes"},"source_id":"2105.09841","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c2c404a1834d7b39e72be274ee64874a7d624e697d54fb6d874a876806c186c9","sha256:ddaea783ad0b95bd386a9a72790e03fa3cfb092208367835a869a2e63a84d3dd"],"state_sha256":"89d83bab1359a8817bd6dbc6778136d48c0b86e788cd258441efd94df840d3c1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9sHtpdviN+sIovxg3hxsq3kzANbM5h4P/tjSjZw/WUBN4+eaP5sa2EqxlWVDFcck0rG2iIKwxGEUN6VlzdDrAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-22T03:57:35.138595Z","bundle_sha256":"166ae9bce89f4835e2c4f7dd366377bcf983cfd332201020f6830930215fac95"}}