{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:SCUKAJ75LP3T4ERM62ZXSCTWQ3","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":"5aee1ccdac82d98a7a9ac07ec9136265dca547fe8ae572b4d0cb49d317dec1fe","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2025-07-20T16:02:32Z","title_canon_sha256":"ded212177f616b5dfa76245d998037ff4ae618a0933f61db05cc00f3c38ff0f5"},"schema_version":"1.0","source":{"id":"2507.15018","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.15018","created_at":"2026-07-05T11:40:16Z"},{"alias_kind":"arxiv_version","alias_value":"2507.15018v1","created_at":"2026-07-05T11:40:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.15018","created_at":"2026-07-05T11:40:16Z"},{"alias_kind":"pith_short_12","alias_value":"SCUKAJ75LP3T","created_at":"2026-07-05T11:40:16Z"},{"alias_kind":"pith_short_16","alias_value":"SCUKAJ75LP3T4ERM","created_at":"2026-07-05T11:40:16Z"},{"alias_kind":"pith_short_8","alias_value":"SCUKAJ75","created_at":"2026-07-05T11:40:16Z"}],"graph_snapshots":[{"event_id":"sha256:0dcf7de628b13b995b6e92f7e6115334922b3e6dd17dd3e4ebf48eb3d09442e1","target":"graph","created_at":"2026-07-05T11:40:16Z","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/2507.15018/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We implement an integrated multi-electrode array on a silicon-nitride-based photonic integrated circuit for ex-vivo retinal characterization via optical stimulation. The interrogation beam formers, based on curved grating emitters and optical phased arrays, are designed to achieve transverse focusing with spot sizes in the 1 - 2 $\\mu$m range to target single cells. The experimentally realized focusing optical phased arrays show suppressed side-lobes, with approximately 11.5% of the power in each side-lobe and ~60% in the main lobe, reducing unintentional cellular excitation. Additional design ","authors_text":"Alireza Tabatabaei Mashayekh, Alvaro Moscoso M\\'artir, Florian Merget, Jeremy Witzens, Pedram Hosseini, Prachi Agrawal, Rebecca Rodrigo, Sandra Johnen, Yuntian Ding","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2025-07-20T16:02:32Z","title":"A focusing optical phased array for tissue interrogation with side-lobe suppression and simplified beam steering"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.15018","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":"sha256:8e60357dffcd9d52007fff0251d6c04bc745b9d36bfc95e78e8710a03fdf1891","target":"record","created_at":"2026-07-05T11:40:16Z","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":"5aee1ccdac82d98a7a9ac07ec9136265dca547fe8ae572b4d0cb49d317dec1fe","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2025-07-20T16:02:32Z","title_canon_sha256":"ded212177f616b5dfa76245d998037ff4ae618a0933f61db05cc00f3c38ff0f5"},"schema_version":"1.0","source":{"id":"2507.15018","kind":"arxiv","version":1}},"canonical_sha256":"90a8a027fd5bf73e122cf6b3790a7686f01c19d2998ee1969a48fdc5d0c446f5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"90a8a027fd5bf73e122cf6b3790a7686f01c19d2998ee1969a48fdc5d0c446f5","first_computed_at":"2026-07-05T11:40:16.803307Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:40:16.803307Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JQPh34+eDMhFe0KQ3n6cpBogjx7NkeTJ6CmG7rh/Zsw+V+0NyWjZ4YzTddbIJaQfKGLG+LDvOvIJSRkXkgN8CA==","signature_status":"signed_v1","signed_at":"2026-07-05T11:40:16.803890Z","signed_message":"canonical_sha256_bytes"},"source_id":"2507.15018","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8e60357dffcd9d52007fff0251d6c04bc745b9d36bfc95e78e8710a03fdf1891","sha256:0dcf7de628b13b995b6e92f7e6115334922b3e6dd17dd3e4ebf48eb3d09442e1"],"state_sha256":"b5cc0afa3fc4b455b316297b0c1440287005e187714385d46a1ab84d0fd96771"}