{"title":"薄膜铌酸锂波导用二氧化钛辅助金属聚焦光栅耦合器。","authors":"Jungwoo Lee, Min-Suk Kwon","doi":"10.1364/OL.555001","DOIUrl":null,"url":null,"abstract":"<p><p>Thin-film lithium niobate (TFLN)-based photonic integrated circuits (PICs) demand efficient, compact, and simply realizable grating couplers for optimal performance. This work introduces titanium dioxide (TiO<sub>2</sub>)-assisted metal focusing grating couplers (TMFGCs) as a promising solution. The TMFGCs leverage a simplified fabrication process based on metal gratings. Moreover, they achieve a smaller footprint compared to previous one-dimensional metal grating couplers (GCs). Theoretical simulations predict a 1.3 dB enhancement in coupling efficiency (CE) due to the integrated TiO<sub>2</sub> structure. Experimental results demonstrate a maximum coupling efficiency of -4.88 dB, with the potential to reach -4.07 dB through refined fabrication techniques. The TMFGCs offer a simple yet effective approach to efficient light coupling in TFLN-based PICs.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2133-2136"},"PeriodicalIF":3.1000,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Titanium dioxide-assisted metal focusing grating couplers for thin-film lithium niobate waveguides.\",\"authors\":\"Jungwoo Lee, Min-Suk Kwon\",\"doi\":\"10.1364/OL.555001\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Thin-film lithium niobate (TFLN)-based photonic integrated circuits (PICs) demand efficient, compact, and simply realizable grating couplers for optimal performance. This work introduces titanium dioxide (TiO<sub>2</sub>)-assisted metal focusing grating couplers (TMFGCs) as a promising solution. The TMFGCs leverage a simplified fabrication process based on metal gratings. Moreover, they achieve a smaller footprint compared to previous one-dimensional metal grating couplers (GCs). Theoretical simulations predict a 1.3 dB enhancement in coupling efficiency (CE) due to the integrated TiO<sub>2</sub> structure. Experimental results demonstrate a maximum coupling efficiency of -4.88 dB, with the potential to reach -4.07 dB through refined fabrication techniques. The TMFGCs offer a simple yet effective approach to efficient light coupling in TFLN-based PICs.</p>\",\"PeriodicalId\":19540,\"journal\":{\"name\":\"Optics letters\",\"volume\":\"50 7\",\"pages\":\"2133-2136\"},\"PeriodicalIF\":3.1000,\"publicationDate\":\"2025-04-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Optics letters\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.1364/OL.555001\",\"RegionNum\":2,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"OPTICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1364/OL.555001","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
Titanium dioxide-assisted metal focusing grating couplers for thin-film lithium niobate waveguides.
Thin-film lithium niobate (TFLN)-based photonic integrated circuits (PICs) demand efficient, compact, and simply realizable grating couplers for optimal performance. This work introduces titanium dioxide (TiO2)-assisted metal focusing grating couplers (TMFGCs) as a promising solution. The TMFGCs leverage a simplified fabrication process based on metal gratings. Moreover, they achieve a smaller footprint compared to previous one-dimensional metal grating couplers (GCs). Theoretical simulations predict a 1.3 dB enhancement in coupling efficiency (CE) due to the integrated TiO2 structure. Experimental results demonstrate a maximum coupling efficiency of -4.88 dB, with the potential to reach -4.07 dB through refined fabrication techniques. The TMFGCs offer a simple yet effective approach to efficient light coupling in TFLN-based PICs.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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