{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:UKCHX7IZNEILUXZLSDB5R55BU7","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":"1c88990da356eb288a9a3af655acf7b8273de077bcfeb68d6732ef25f17c6040","cross_cats_sorted":[],"license":"","primary_cat":"cond-mat.other","submitted_at":"2007-03-27T23:24:50Z","title_canon_sha256":"c3ade953bf683c5a5a96030a7afc28ddf4aef7f8229bb9714fc858eafe132ec4"},"schema_version":"1.0","source":{"id":"cond-mat/0703733","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/0703733","created_at":"2026-05-18T04:08:54Z"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/0703733v2","created_at":"2026-05-18T04:08:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/0703733","created_at":"2026-05-18T04:08:54Z"},{"alias_kind":"pith_short_12","alias_value":"UKCHX7IZNEIL","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"UKCHX7IZNEILUXZL","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"UKCHX7IZ","created_at":"2026-05-18T12:25:56Z"}],"graph_snapshots":[{"event_id":"sha256:746003607913bc9764b64dfc21529ee81bdfdd76fd05dfaf704538af20004be3","target":"graph","created_at":"2026-05-18T04:08:54Z","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 show that with an appropriate surface modification, a slab of photonic crystal can be made to allow wave transmission within the band gap. Furthermore, negative refraction and all-angle-negative-refraction (AANR) can be achieved by this surface modification in frequency windows that were not realized before in two-dimensional photonic crystals [C. Luo et al, Phys. Rev. B 65, 201104 (2002)]. This approach to AANR leads to new applications in flat lens imaging. Previous flat lens using photonic crystals requires object-image distance u+v less than or equal to the lens thickness d, u+v d. Our ","authors_text":"S. Sridhar, W. T. Lu, Y. J. Huang","cross_cats":[],"headline":"","license":"","primary_cat":"cond-mat.other","submitted_at":"2007-03-27T23:24:50Z","title":"Alternative approach to all-angle negative refraction in two-dimensional photonic crystals"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/0703733","kind":"arxiv","version":2},"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:d394d8d8d2108b1d1ce9ec7f8e995d3e4e7f86cabd6d1e9af70c2c7cfc0445f8","target":"record","created_at":"2026-05-18T04:08:54Z","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":"1c88990da356eb288a9a3af655acf7b8273de077bcfeb68d6732ef25f17c6040","cross_cats_sorted":[],"license":"","primary_cat":"cond-mat.other","submitted_at":"2007-03-27T23:24:50Z","title_canon_sha256":"c3ade953bf683c5a5a96030a7afc28ddf4aef7f8229bb9714fc858eafe132ec4"},"schema_version":"1.0","source":{"id":"cond-mat/0703733","kind":"arxiv","version":2}},"canonical_sha256":"a2847bfd196910ba5f2b90c3d8f7a1a7f57dc1eb7d7bf1af92434a92ffb81ca6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a2847bfd196910ba5f2b90c3d8f7a1a7f57dc1eb7d7bf1af92434a92ffb81ca6","first_computed_at":"2026-05-18T04:08:54.434847Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:08:54.434847Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1NJkMMubimrDOfh+oJYtflPBtb4p7i121k6t3306BUvayDoG2e63vNrnZGhfQLUDjorkUsmKZInN/gV31joxDg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:08:54.435327Z","signed_message":"canonical_sha256_bytes"},"source_id":"cond-mat/0703733","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d394d8d8d2108b1d1ce9ec7f8e995d3e4e7f86cabd6d1e9af70c2c7cfc0445f8","sha256:746003607913bc9764b64dfc21529ee81bdfdd76fd05dfaf704538af20004be3"],"state_sha256":"7d8a472867fba9de36fe2fab15fd8aa582647682089812485efc43508da4cc01"}