{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:RBVJVZMMATEQ66FUPEOAAKIH43","short_pith_number":"pith:RBVJVZMM","canonical_record":{"source":{"id":"1809.05276","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-09-14T06:52:50Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"a8a08be99bf719ff186514d14de7d0543a6b4411f7278c826d81534ec28c4b4a","abstract_canon_sha256":"9e4b83afab990d42a8c77064b08c82725ca6f6a4dde1bc1a601a3f3320ce7b1e"},"schema_version":"1.0"},"canonical_sha256":"886a9ae58c04c90f78b4791c002907e6e89ce5dfcc08aa130d96a40f71f7e425","source":{"kind":"arxiv","id":"1809.05276","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.05276","created_at":"2026-05-18T00:00:50Z"},{"alias_kind":"arxiv_version","alias_value":"1809.05276v1","created_at":"2026-05-18T00:00:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.05276","created_at":"2026-05-18T00:00:50Z"},{"alias_kind":"pith_short_12","alias_value":"RBVJVZMMATEQ","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"RBVJVZMMATEQ66FU","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"RBVJVZMM","created_at":"2026-05-18T12:32:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:RBVJVZMMATEQ66FUPEOAAKIH43","target":"record","payload":{"canonical_record":{"source":{"id":"1809.05276","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-09-14T06:52:50Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"a8a08be99bf719ff186514d14de7d0543a6b4411f7278c826d81534ec28c4b4a","abstract_canon_sha256":"9e4b83afab990d42a8c77064b08c82725ca6f6a4dde1bc1a601a3f3320ce7b1e"},"schema_version":"1.0"},"canonical_sha256":"886a9ae58c04c90f78b4791c002907e6e89ce5dfcc08aa130d96a40f71f7e425","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:00:50.163231Z","signature_b64":"/zgpwgDWIvHTlUXX8vi7oz5VosFoq/+FuK8xCN2a4cJwfaBlkdtcMvFrHwzMOMAnbh5uxY0nwnVLEb68fZUbDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"886a9ae58c04c90f78b4791c002907e6e89ce5dfcc08aa130d96a40f71f7e425","last_reissued_at":"2026-05-18T00:00:50.162720Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:00:50.162720Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.05276","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":"2026-05-18T00:00:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Wn62sLzV89p6gu6p8ZRzzZ1iLgnW6+FI6gwmPPQ2AZgPIOuRv3TO2DUCe+bE+/oZvKqDF7w3TNb/1gGMlRvlAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:50:46.910741Z"},"content_sha256":"9a7d182b50c14aed804a4a37dcd8db47f8f8d1bf05f63dab2e47e9a747954e52","schema_version":"1.0","event_id":"sha256:9a7d182b50c14aed804a4a37dcd8db47f8f8d1bf05f63dab2e47e9a747954e52"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:RBVJVZMMATEQ66FUPEOAAKIH43","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Unidirectional Photonic Circuit with Phase-Change Fano Resonator","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.app-ph"],"primary_cat":"physics.optics","authors_text":"Boris Shapiro, Eleana Makri, Ilya Vitebskiy, Roney Thomas, Tsampikos Kottos","submitted_at":"2018-09-14T06:52:50Z","abstract_excerpt":"We demonstrate that the integration of a phase-change material (PCM) in one of the two microresonators of a photonic metamolecule, coupled to a bus waveguide, can lead to unidirectional Fano resonances and to the emergence of a unidirectional transmission window. The phase change is caused by light-induced heating and is accompanied by an abrupt increase in the extinction coefficient of the PCM resonator. Due to the photonic circuit asymmetry, the critical value of the input light intensity triggering the phase change is strongly dependent on the input light direction. The latter determines th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.05276","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":"2026-05-18T00:00:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rBtKiZIcWwGSO+ixmaChclg0w/QdWmDE1agZjOdoLCygHkhfasEFPCWd4K0O700FP4DXCcfIXX2Nf+dQJBwaBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T11:50:46.911276Z"},"content_sha256":"efd03eb40204f785b13e1dc4e5e131316691c087740cb9bcffb424fda150d9bc","schema_version":"1.0","event_id":"sha256:efd03eb40204f785b13e1dc4e5e131316691c087740cb9bcffb424fda150d9bc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RBVJVZMMATEQ66FUPEOAAKIH43/bundle.json","state_url":"https://pith.science/pith/RBVJVZMMATEQ66FUPEOAAKIH43/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RBVJVZMMATEQ66FUPEOAAKIH43/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":"2026-05-26T11:50:46Z","links":{"resolver":"https://pith.science/pith/RBVJVZMMATEQ66FUPEOAAKIH43","bundle":"https://pith.science/pith/RBVJVZMMATEQ66FUPEOAAKIH43/bundle.json","state":"https://pith.science/pith/RBVJVZMMATEQ66FUPEOAAKIH43/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RBVJVZMMATEQ66FUPEOAAKIH43/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:RBVJVZMMATEQ66FUPEOAAKIH43","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":"9e4b83afab990d42a8c77064b08c82725ca6f6a4dde1bc1a601a3f3320ce7b1e","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-09-14T06:52:50Z","title_canon_sha256":"a8a08be99bf719ff186514d14de7d0543a6b4411f7278c826d81534ec28c4b4a"},"schema_version":"1.0","source":{"id":"1809.05276","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.05276","created_at":"2026-05-18T00:00:50Z"},{"alias_kind":"arxiv_version","alias_value":"1809.05276v1","created_at":"2026-05-18T00:00:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.05276","created_at":"2026-05-18T00:00:50Z"},{"alias_kind":"pith_short_12","alias_value":"RBVJVZMMATEQ","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"RBVJVZMMATEQ66FU","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"RBVJVZMM","created_at":"2026-05-18T12:32:50Z"}],"graph_snapshots":[{"event_id":"sha256:efd03eb40204f785b13e1dc4e5e131316691c087740cb9bcffb424fda150d9bc","target":"graph","created_at":"2026-05-18T00:00:50Z","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 demonstrate that the integration of a phase-change material (PCM) in one of the two microresonators of a photonic metamolecule, coupled to a bus waveguide, can lead to unidirectional Fano resonances and to the emergence of a unidirectional transmission window. The phase change is caused by light-induced heating and is accompanied by an abrupt increase in the extinction coefficient of the PCM resonator. Due to the photonic circuit asymmetry, the critical value of the input light intensity triggering the phase change is strongly dependent on the input light direction. The latter determines th","authors_text":"Boris Shapiro, Eleana Makri, Ilya Vitebskiy, Roney Thomas, Tsampikos Kottos","cross_cats":["physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-09-14T06:52:50Z","title":"Unidirectional Photonic Circuit with Phase-Change Fano Resonator"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.05276","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":"sha256:9a7d182b50c14aed804a4a37dcd8db47f8f8d1bf05f63dab2e47e9a747954e52","target":"record","created_at":"2026-05-18T00:00:50Z","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":"9e4b83afab990d42a8c77064b08c82725ca6f6a4dde1bc1a601a3f3320ce7b1e","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-09-14T06:52:50Z","title_canon_sha256":"a8a08be99bf719ff186514d14de7d0543a6b4411f7278c826d81534ec28c4b4a"},"schema_version":"1.0","source":{"id":"1809.05276","kind":"arxiv","version":1}},"canonical_sha256":"886a9ae58c04c90f78b4791c002907e6e89ce5dfcc08aa130d96a40f71f7e425","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"886a9ae58c04c90f78b4791c002907e6e89ce5dfcc08aa130d96a40f71f7e425","first_computed_at":"2026-05-18T00:00:50.162720Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:00:50.162720Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/zgpwgDWIvHTlUXX8vi7oz5VosFoq/+FuK8xCN2a4cJwfaBlkdtcMvFrHwzMOMAnbh5uxY0nwnVLEb68fZUbDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:00:50.163231Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.05276","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9a7d182b50c14aed804a4a37dcd8db47f8f8d1bf05f63dab2e47e9a747954e52","sha256:efd03eb40204f785b13e1dc4e5e131316691c087740cb9bcffb424fda150d9bc"],"state_sha256":"81201486c64d51abf46d5939c19ce74ad8690ed713318d271377fe837b95e3c3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kvEno9dgsyOQGC7IVV+3J8rmJKcrV713l/P5YfbINEMDD3bu1RYqT3WOSTikrwUjXp+jU0eN+OsUioMi4RNgDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T11:50:46.914666Z","bundle_sha256":"9af117608b131d51bffe9d84613f5ae1e76471f9690ed790f5361afa3fa7e58d"}}