{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:NFK6SBYI6FILATZJJ4TX7OQD4I","short_pith_number":"pith:NFK6SBYI","canonical_record":{"source":{"id":"1903.11957","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2019-03-26T16:05:34Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"9ee7d8fb2848de3c8452cb52182f6d0d4bb337d999646a1427cfeb02ad538a3f","abstract_canon_sha256":"f99d7a2b78d62d2ba93f185a120f057625784f412a2254157557ce9156d8fb9b"},"schema_version":"1.0"},"canonical_sha256":"6955e90708f150b04f294f277fba03e2275d011ee6671b0b3fcf8413b3045fda","source":{"kind":"arxiv","id":"1903.11957","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.11957","created_at":"2026-05-17T23:49:58Z"},{"alias_kind":"arxiv_version","alias_value":"1903.11957v1","created_at":"2026-05-17T23:49:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.11957","created_at":"2026-05-17T23:49:58Z"},{"alias_kind":"pith_short_12","alias_value":"NFK6SBYI6FIL","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"NFK6SBYI6FILATZJ","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"NFK6SBYI","created_at":"2026-05-18T12:33:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:NFK6SBYI6FILATZJJ4TX7OQD4I","target":"record","payload":{"canonical_record":{"source":{"id":"1903.11957","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2019-03-26T16:05:34Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"9ee7d8fb2848de3c8452cb52182f6d0d4bb337d999646a1427cfeb02ad538a3f","abstract_canon_sha256":"f99d7a2b78d62d2ba93f185a120f057625784f412a2254157557ce9156d8fb9b"},"schema_version":"1.0"},"canonical_sha256":"6955e90708f150b04f294f277fba03e2275d011ee6671b0b3fcf8413b3045fda","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:49:58.557997Z","signature_b64":"uEy230iyL7B/E/Od9261uU1Gzk4/kOJFs1u4PgOKfyKn3ssIh3WK/amT6GiWJwkRISg6QoaO/b4NJ7ex0aD8DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6955e90708f150b04f294f277fba03e2275d011ee6671b0b3fcf8413b3045fda","last_reissued_at":"2026-05-17T23:49:58.557332Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:49:58.557332Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1903.11957","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":"2026-05-17T23:49:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kPH81JVv8RgoJxdE26ylMOZqOzH4MD5rIbt67aRAyLRob2VBxDYEI5+FS3itmNl5ePhMZ/RcoM4h4zIEd1BDAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T07:48:40.251283Z"},"content_sha256":"b2e05a79c881d206eaedb0aa817407d2d346086c334fdb651d98ecabd36583e3","schema_version":"1.0","event_id":"sha256:b2e05a79c881d206eaedb0aa817407d2d346086c334fdb651d98ecabd36583e3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:NFK6SBYI6FILATZJJ4TX7OQD4I","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Nonreciprocal Phase Gradient Metasurface: Principle and Transistor Implementation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.app-ph"],"primary_cat":"physics.class-ph","authors_text":"Christophe Caloz, Guillaume Lavigne","submitted_at":"2019-03-26T16:05:34Z","abstract_excerpt":"We introduce the concept of nonreciprocal nongyrotropic phase gradient metasurfaces. Such metasurfaces are based on bianisotropic phase shifting unit cells, with the required nonreciprocal and nongyrotropic characteristics. Moreover, we present a transistor-based implementation of a nonreciprocal phase shifting subwavelength unit cell. Finally, we demonstrate the concept with a simulation of a 6-port spatial circulator application."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.11957","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":"2026-05-17T23:49:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2bcqKR9ykoAWIGYUjm0Wfxip1Qy13q9sxhcE8Z102n1oBaXYei3L4uTS0uKcBjc9xgMRNHS5ccXki3kKIgvjBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T07:48:40.251633Z"},"content_sha256":"123b813e638b64cf2163ff524297e78b815bb23b555552f4827d7072af11c4c3","schema_version":"1.0","event_id":"sha256:123b813e638b64cf2163ff524297e78b815bb23b555552f4827d7072af11c4c3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NFK6SBYI6FILATZJJ4TX7OQD4I/bundle.json","state_url":"https://pith.science/pith/NFK6SBYI6FILATZJJ4TX7OQD4I/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NFK6SBYI6FILATZJJ4TX7OQD4I/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":"2026-06-20T07:48:40Z","links":{"resolver":"https://pith.science/pith/NFK6SBYI6FILATZJJ4TX7OQD4I","bundle":"https://pith.science/pith/NFK6SBYI6FILATZJJ4TX7OQD4I/bundle.json","state":"https://pith.science/pith/NFK6SBYI6FILATZJJ4TX7OQD4I/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NFK6SBYI6FILATZJJ4TX7OQD4I/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:NFK6SBYI6FILATZJJ4TX7OQD4I","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":"f99d7a2b78d62d2ba93f185a120f057625784f412a2254157557ce9156d8fb9b","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2019-03-26T16:05:34Z","title_canon_sha256":"9ee7d8fb2848de3c8452cb52182f6d0d4bb337d999646a1427cfeb02ad538a3f"},"schema_version":"1.0","source":{"id":"1903.11957","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.11957","created_at":"2026-05-17T23:49:58Z"},{"alias_kind":"arxiv_version","alias_value":"1903.11957v1","created_at":"2026-05-17T23:49:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.11957","created_at":"2026-05-17T23:49:58Z"},{"alias_kind":"pith_short_12","alias_value":"NFK6SBYI6FIL","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_16","alias_value":"NFK6SBYI6FILATZJ","created_at":"2026-05-18T12:33:24Z"},{"alias_kind":"pith_short_8","alias_value":"NFK6SBYI","created_at":"2026-05-18T12:33:24Z"}],"graph_snapshots":[{"event_id":"sha256:123b813e638b64cf2163ff524297e78b815bb23b555552f4827d7072af11c4c3","target":"graph","created_at":"2026-05-17T23:49:58Z","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 introduce the concept of nonreciprocal nongyrotropic phase gradient metasurfaces. Such metasurfaces are based on bianisotropic phase shifting unit cells, with the required nonreciprocal and nongyrotropic characteristics. Moreover, we present a transistor-based implementation of a nonreciprocal phase shifting subwavelength unit cell. Finally, we demonstrate the concept with a simulation of a 6-port spatial circulator application.","authors_text":"Christophe Caloz, Guillaume Lavigne","cross_cats":["physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2019-03-26T16:05:34Z","title":"Nonreciprocal Phase Gradient Metasurface: Principle and Transistor Implementation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.11957","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:b2e05a79c881d206eaedb0aa817407d2d346086c334fdb651d98ecabd36583e3","target":"record","created_at":"2026-05-17T23:49:58Z","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":"f99d7a2b78d62d2ba93f185a120f057625784f412a2254157557ce9156d8fb9b","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.class-ph","submitted_at":"2019-03-26T16:05:34Z","title_canon_sha256":"9ee7d8fb2848de3c8452cb52182f6d0d4bb337d999646a1427cfeb02ad538a3f"},"schema_version":"1.0","source":{"id":"1903.11957","kind":"arxiv","version":1}},"canonical_sha256":"6955e90708f150b04f294f277fba03e2275d011ee6671b0b3fcf8413b3045fda","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6955e90708f150b04f294f277fba03e2275d011ee6671b0b3fcf8413b3045fda","first_computed_at":"2026-05-17T23:49:58.557332Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:49:58.557332Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uEy230iyL7B/E/Od9261uU1Gzk4/kOJFs1u4PgOKfyKn3ssIh3WK/amT6GiWJwkRISg6QoaO/b4NJ7ex0aD8DQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:49:58.557997Z","signed_message":"canonical_sha256_bytes"},"source_id":"1903.11957","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b2e05a79c881d206eaedb0aa817407d2d346086c334fdb651d98ecabd36583e3","sha256:123b813e638b64cf2163ff524297e78b815bb23b555552f4827d7072af11c4c3"],"state_sha256":"c1f4cba4bab8221a8d058bdb7e16e5553793785aee297c055a38bfd1ffa53bc9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rI7knH1J+9KcopGgWEK2dGBi3FEUmefxffW+D254LFgI5P613Y9KlZZrhzBn3nB1wljUPUQZlMmIpCh/hHfVDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-20T07:48:40.255019Z","bundle_sha256":"7cd5ffb2b7a277ec7bb78aed2a3c047be80f68b1dddcd183ee70c091bff73431"}}