{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:7VTJRBBYOEX7DRK2OYD2DVOPVM","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":"c27090658f320d7957d69ed3f8ccb97c00a85dde158dbf2364f03089c04915d5","cross_cats_sorted":["physics.app-ph"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.optics","submitted_at":"2024-11-23T19:42:12Z","title_canon_sha256":"57c16285c5637d6456a719b5472a04d46227cec5879801046bdd25dfa1169ebe"},"schema_version":"1.0","source":{"id":"2412.06801","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2412.06801","created_at":"2026-07-05T09:46:57Z"},{"alias_kind":"arxiv_version","alias_value":"2412.06801v1","created_at":"2026-07-05T09:46:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2412.06801","created_at":"2026-07-05T09:46:57Z"},{"alias_kind":"pith_short_12","alias_value":"7VTJRBBYOEX7","created_at":"2026-07-05T09:46:57Z"},{"alias_kind":"pith_short_16","alias_value":"7VTJRBBYOEX7DRK2","created_at":"2026-07-05T09:46:57Z"},{"alias_kind":"pith_short_8","alias_value":"7VTJRBBY","created_at":"2026-07-05T09:46:57Z"}],"graph_snapshots":[{"event_id":"sha256:6902bff32f7316592989af38817b5dcb61789a275c6b3b569465061d4f19d2f2","target":"graph","created_at":"2026-07-05T09:46:57Z","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/2412.06801/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this work, we present a multi-layer optical phased array (OPA) designed for dual-axis beam steering on a silicon (Si) platform, utilizing only wavelength tuning. Our design eliminates the need for grating couplers, commonly required for dual-axis beam steering, thereby reducing energy losses due to substrate leakage. It also features the unique capability of achieving a positive or negative phase slope profile. This three-dimensional architecture enhances output efficiency by emitting light from the device edge, providing greater flexibility and improved performance in beam steering. This a","authors_text":"Bowen Yu, Venus Kakdarvishi, Yasha Yi","cross_cats":["physics.app-ph"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.optics","submitted_at":"2024-11-23T19:42:12Z","title":"Dual-Axis Beam-Steering OPA with purely Passive Phase Shifters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2412.06801","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:eb53ac805d3c8907ec23910a09d2955b3f29af67a2306d0ea29bc7bcb447c019","target":"record","created_at":"2026-07-05T09:46:57Z","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":"c27090658f320d7957d69ed3f8ccb97c00a85dde158dbf2364f03089c04915d5","cross_cats_sorted":["physics.app-ph"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.optics","submitted_at":"2024-11-23T19:42:12Z","title_canon_sha256":"57c16285c5637d6456a719b5472a04d46227cec5879801046bdd25dfa1169ebe"},"schema_version":"1.0","source":{"id":"2412.06801","kind":"arxiv","version":1}},"canonical_sha256":"fd66988438712ff1c55a7607a1d5cfab2963c4bd704980f4ba486394247cf3da","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fd66988438712ff1c55a7607a1d5cfab2963c4bd704980f4ba486394247cf3da","first_computed_at":"2026-07-05T09:46:57.156223Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:46:57.156223Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1zLvDm3btadTtaBnmU9+vYvKycndtpbRQSq1Gxkul++wcpHHeZA54m68j1zZW33ASAMHjW5iQzw3byyoUnQHAA==","signature_status":"signed_v1","signed_at":"2026-07-05T09:46:57.157351Z","signed_message":"canonical_sha256_bytes"},"source_id":"2412.06801","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:eb53ac805d3c8907ec23910a09d2955b3f29af67a2306d0ea29bc7bcb447c019","sha256:6902bff32f7316592989af38817b5dcb61789a275c6b3b569465061d4f19d2f2"],"state_sha256":"da63677b835f0fee672a5f9799d2b4261018be3f80c7e16074fdaa2fe0463739"}