{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:LED7PJEQYQTHJOXBDKRZYB67CY","short_pith_number":"pith:LED7PJEQ","canonical_record":{"source":{"id":"1509.04815","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-09-16T05:48:49Z","cross_cats_sorted":[],"title_canon_sha256":"2d4ad2234aebb37a1eb95deb2f464d420b794778e21774cb01e0c52a679cb496","abstract_canon_sha256":"51744f2ac4a367996863a695944d7e0d8d3224e9b5f51475202a6f11e2162f7f"},"schema_version":"1.0"},"canonical_sha256":"5907f7a490c42674bae11aa39c07df1613cbde4f10277070c65edb855fcc2cac","source":{"kind":"arxiv","id":"1509.04815","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.04815","created_at":"2026-05-18T01:32:51Z"},{"alias_kind":"arxiv_version","alias_value":"1509.04815v1","created_at":"2026-05-18T01:32:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.04815","created_at":"2026-05-18T01:32:51Z"},{"alias_kind":"pith_short_12","alias_value":"LED7PJEQYQTH","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LED7PJEQYQTHJOXB","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LED7PJEQ","created_at":"2026-05-18T12:29:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:LED7PJEQYQTHJOXBDKRZYB67CY","target":"record","payload":{"canonical_record":{"source":{"id":"1509.04815","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-09-16T05:48:49Z","cross_cats_sorted":[],"title_canon_sha256":"2d4ad2234aebb37a1eb95deb2f464d420b794778e21774cb01e0c52a679cb496","abstract_canon_sha256":"51744f2ac4a367996863a695944d7e0d8d3224e9b5f51475202a6f11e2162f7f"},"schema_version":"1.0"},"canonical_sha256":"5907f7a490c42674bae11aa39c07df1613cbde4f10277070c65edb855fcc2cac","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:32:51.648034Z","signature_b64":"ovppZLw3AsTDqZ2q81WykwelndpKzsoLJUo9ebkexP9HVlL1uVLtQ15g07CVg0BFw+MAsF+f2POrULF1PzOeBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5907f7a490c42674bae11aa39c07df1613cbde4f10277070c65edb855fcc2cac","last_reissued_at":"2026-05-18T01:32:51.647402Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:32:51.647402Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.04815","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":"2026-05-18T01:32:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mhxyHAvzTxZVSc0SYJjn8b90p6xPN8ArHyTK0I7zN6wyDfY4XwuKNOSE77LPyDEIGBP//T6gl84FWY5apBP4AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T17:49:46.699581Z"},"content_sha256":"6526aa46f65ff8bf2026de983fbf1de7ac828d7c6e096e2049a57cbfd44bdb2a","schema_version":"1.0","event_id":"sha256:6526aa46f65ff8bf2026de983fbf1de7ac828d7c6e096e2049a57cbfd44bdb2a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:LED7PJEQYQTHJOXBDKRZYB67CY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Broadband high reflectivity in subwavelength-grating slab waveguides","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Hao Tian, Xuan Cui, Zhongxiang Zhou","submitted_at":"2015-09-16T05:48:49Z","abstract_excerpt":"We computationally study a subwavelength dielectric grating structure, show that slab waveguide modes can be used to obtain broadband high reflectivity, and analyze how slab waveguide modes influence reflection. A structure showing interference between Fabry-Perot modes, slab waveguide modes, and waveguide array modes is designed with ultra-broadband high reflectivity. Owing to the coupling of guided modes, the region with reflectivity R > 0.99 has an ultra-high bandwidth ( {\\Delta}f/f > 30%). The incident-angle region with R > 0.99 extends over a range greater than 40{\\deg}. Moreover, an asym"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.04815","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":"2026-05-18T01:32:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WuXyBzNNAYLl1GmZs+hYNiOgB4MzcoKrP2h69ds2TAcosaGSoAni502GaFTk/6EgQbWGxkW1X5dgJBg0oWK/CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T17:49:46.699926Z"},"content_sha256":"6ec7aedb424b7ae156196c72e670c986f8f305971e6ceedd85b740946f1e6779","schema_version":"1.0","event_id":"sha256:6ec7aedb424b7ae156196c72e670c986f8f305971e6ceedd85b740946f1e6779"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LED7PJEQYQTHJOXBDKRZYB67CY/bundle.json","state_url":"https://pith.science/pith/LED7PJEQYQTHJOXBDKRZYB67CY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LED7PJEQYQTHJOXBDKRZYB67CY/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":"2026-06-03T17:49:46Z","links":{"resolver":"https://pith.science/pith/LED7PJEQYQTHJOXBDKRZYB67CY","bundle":"https://pith.science/pith/LED7PJEQYQTHJOXBDKRZYB67CY/bundle.json","state":"https://pith.science/pith/LED7PJEQYQTHJOXBDKRZYB67CY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LED7PJEQYQTHJOXBDKRZYB67CY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:LED7PJEQYQTHJOXBDKRZYB67CY","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":"51744f2ac4a367996863a695944d7e0d8d3224e9b5f51475202a6f11e2162f7f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-09-16T05:48:49Z","title_canon_sha256":"2d4ad2234aebb37a1eb95deb2f464d420b794778e21774cb01e0c52a679cb496"},"schema_version":"1.0","source":{"id":"1509.04815","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.04815","created_at":"2026-05-18T01:32:51Z"},{"alias_kind":"arxiv_version","alias_value":"1509.04815v1","created_at":"2026-05-18T01:32:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.04815","created_at":"2026-05-18T01:32:51Z"},{"alias_kind":"pith_short_12","alias_value":"LED7PJEQYQTH","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LED7PJEQYQTHJOXB","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LED7PJEQ","created_at":"2026-05-18T12:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:6ec7aedb424b7ae156196c72e670c986f8f305971e6ceedd85b740946f1e6779","target":"graph","created_at":"2026-05-18T01:32:51Z","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 computationally study a subwavelength dielectric grating structure, show that slab waveguide modes can be used to obtain broadband high reflectivity, and analyze how slab waveguide modes influence reflection. A structure showing interference between Fabry-Perot modes, slab waveguide modes, and waveguide array modes is designed with ultra-broadband high reflectivity. Owing to the coupling of guided modes, the region with reflectivity R > 0.99 has an ultra-high bandwidth ( {\\Delta}f/f > 30%). The incident-angle region with R > 0.99 extends over a range greater than 40{\\deg}. Moreover, an asym","authors_text":"Hao Tian, Xuan Cui, Zhongxiang Zhou","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-09-16T05:48:49Z","title":"Broadband high reflectivity in subwavelength-grating slab waveguides"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.04815","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":"sha256:6526aa46f65ff8bf2026de983fbf1de7ac828d7c6e096e2049a57cbfd44bdb2a","target":"record","created_at":"2026-05-18T01:32:51Z","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":"51744f2ac4a367996863a695944d7e0d8d3224e9b5f51475202a6f11e2162f7f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2015-09-16T05:48:49Z","title_canon_sha256":"2d4ad2234aebb37a1eb95deb2f464d420b794778e21774cb01e0c52a679cb496"},"schema_version":"1.0","source":{"id":"1509.04815","kind":"arxiv","version":1}},"canonical_sha256":"5907f7a490c42674bae11aa39c07df1613cbde4f10277070c65edb855fcc2cac","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5907f7a490c42674bae11aa39c07df1613cbde4f10277070c65edb855fcc2cac","first_computed_at":"2026-05-18T01:32:51.647402Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:32:51.647402Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ovppZLw3AsTDqZ2q81WykwelndpKzsoLJUo9ebkexP9HVlL1uVLtQ15g07CVg0BFw+MAsF+f2POrULF1PzOeBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:32:51.648034Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.04815","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6526aa46f65ff8bf2026de983fbf1de7ac828d7c6e096e2049a57cbfd44bdb2a","sha256:6ec7aedb424b7ae156196c72e670c986f8f305971e6ceedd85b740946f1e6779"],"state_sha256":"6eb85f2146337011af9190e6fcfed744142a75b41692c0638d3ce1048ecf06bd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8vfrbLKhQ8bz6VEmO2nqNRRgAbd1exDgMb6AA9E2ZXO1CHKhObXVe1csV4W85QuHyhPCF+8SL4FFF0UgIg6hCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T17:49:46.701836Z","bundle_sha256":"df5c566d852ee5468252aade7d7bb5da1fd2f5664c9690810b263808a7b812e0"}}