{"corpus_id":258151166,"paper_sha":"813d71ab27600c0c71bb02bc630ab98ba3bbfabe","doi":"10.1364/ol.489387","arxiv_id":null,"pmid":37126299,"pmcid":null,"mag_id":null,"dblp_id":null,"acl_id":null,"title":"Ultrahigh-Q lithium niobate microring resonator with multimode waveguide.","year":2023,"publication_date":"2023-04-13","venue":"Optics Letters","journal":{"name":"Optics letters","pages":"\n          2465-2467\n        ","volume":"48 9"},"journal_issn":null,"journal_title":null,"publication_types":["JournalArticle"],"pubmed_pub_types":["Journal Article"],"s2_fields_of_study":["Medicine","Physics","Engineering"],"reference_count":0,"citation_count":8,"influential_citation_count":0,"is_open_access":false,"arxiv_categories":null,"arxiv_license":null,"arxiv_journal_ref":null,"mesh_headings":null,"chemicals":null,"comments_corrections":null,"source_flags":5,"s2_open_access_pdf_url":null,"s2_open_access_landing_url":null,"s2_open_access_license":null,"s2_open_access_status":null,"pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"Difficulty in etching lithium niobate (LN) results in a relatively high propagation loss, which necessitates sophisticated processes to fabricate high-quality factor (Q) microresonators. Here, we fabricate a multimode microring resonator with an intrinsic Q of 6 × 106, which exhibits a propagation loss 50 times lower than that of a single-mode LN microring fabricated under the same process. Notably, the excitation of higher-order modes in the multimode microring is effectively suppressed by utilizing the Euler bend. The highly regular transmission spectrum of the resonator demonstrates a free spectral range (FSR) of 56 GHz. Based on this microresonator, we implement a bandpass microwave photonic filter with an ultra-narrow 3 dB bandwidth of 47.5 MHz and a large tuning range of 2-26.5 GHz. It can be anticipated that the combination of existing advanced etching techniques with this work will drive the propagation loss of a LN waveguide closer to the material absorption loss, significantly facilitating the optimization of performance in applications requiring ultrahigh-Q LN microresonators, such as frequency combs, frequency conversion, electro-optic modulation, and quantum photonics.","claims":[{"public_id":"cl_ddf4a7bbb859963517f0a0666a082b57","status":"active","text":"A multimode lithium niobate microring resonator was fabricated with an intrinsic Q of 6 × 10^6.","confidence":0.99,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_ddf4a7bbb859963517f0a0666a082b57"},{"public_id":"cl_24afcd8450369ae6f99462a24da2a25a","status":"active","text":"Higher-order modes are effectively suppressed by using the Euler bend.","confidence":0.95,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_24afcd8450369ae6f99462a24da2a25a"},{"public_id":"cl_fce50c9bcfe216aff13003828d2e3b5b","status":"active","text":"Propagation loss in the multimode microring is 50 times lower than in a single-mode lithium niobate microring fabricated under the same process.","confidence":0.97,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_fce50c9bcfe216aff13003828d2e3b5b"},{"public_id":"cl_b98f2d3fa4c1fcf462ca33a1f82101b8","status":"active","text":"The resonator has a free spectral range of 56 GHz and a highly regular transmission spectrum.","confidence":0.96,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous 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