Analysis of Waveguides on Lithium Niobate Thin Films
Waveguides formed by etching, proton-exchange (PE), and strip-loaded on single-crystal lithium niobate (LN) thin film were designed and simulated by a full-vectorial finite difference method. The single-mode condition, optical power distribution, and bending loss of these kinds of waveguides were st...
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| Format: | Article |
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MDPI AG
2018-04-01
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| Series: | Crystals |
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| Online Access: | http://www.mdpi.com/2073-4352/8/5/191 |
| _version_ | 1798002534955089920 |
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| author | Yiwen Wang Zhihua Chen Hui Hu |
| author_facet | Yiwen Wang Zhihua Chen Hui Hu |
| author_sort | Yiwen Wang |
| collection | DOAJ |
| description | Waveguides formed by etching, proton-exchange (PE), and strip-loaded on single-crystal lithium niobate (LN) thin film were designed and simulated by a full-vectorial finite difference method. The single-mode condition, optical power distribution, and bending loss of these kinds of waveguides were studied and compared systematically. For the PE waveguide, the optical power distributed in LN layer had negligible change with the increase of PE thickness. For the strip-loaded waveguide, the relationships between optical power distribution in LN layer and waveguide thickness were different for quasi-TE (q-TE) and quasi-TM (q-TM) modes. The bending loss would decrease with the increase of bending radius. There was a bending loss caused by the electromagnetic field leakage when the neff of q-TM waveguide was smaller than that of nearby TE planar waveguide. LN ridge waveguides possessed a low bending loss even at a relatively small bending radius. This study is helpful for the understanding of waveguide structures as well as for the optimization and the fabrication of high-density integrated optical components. |
| first_indexed | 2024-04-11T11:54:50Z |
| format | Article |
| id | doaj.art-00368317189e41759da809957bac697f |
| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-04-11T11:54:50Z |
| publishDate | 2018-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-00368317189e41759da809957bac697f2022-12-22T04:25:12ZengMDPI AGCrystals2073-43522018-04-018519110.3390/cryst8050191cryst8050191Analysis of Waveguides on Lithium Niobate Thin FilmsYiwen Wang0Zhihua Chen1Hui Hu2School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, ChinaSchool of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, ChinaSchool of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, ChinaWaveguides formed by etching, proton-exchange (PE), and strip-loaded on single-crystal lithium niobate (LN) thin film were designed and simulated by a full-vectorial finite difference method. The single-mode condition, optical power distribution, and bending loss of these kinds of waveguides were studied and compared systematically. For the PE waveguide, the optical power distributed in LN layer had negligible change with the increase of PE thickness. For the strip-loaded waveguide, the relationships between optical power distribution in LN layer and waveguide thickness were different for quasi-TE (q-TE) and quasi-TM (q-TM) modes. The bending loss would decrease with the increase of bending radius. There was a bending loss caused by the electromagnetic field leakage when the neff of q-TM waveguide was smaller than that of nearby TE planar waveguide. LN ridge waveguides possessed a low bending loss even at a relatively small bending radius. This study is helpful for the understanding of waveguide structures as well as for the optimization and the fabrication of high-density integrated optical components.http://www.mdpi.com/2073-4352/8/5/191integrated opticslithium niobatethin filmbent waveguide |
| spellingShingle | Yiwen Wang Zhihua Chen Hui Hu Analysis of Waveguides on Lithium Niobate Thin Films Crystals integrated optics lithium niobate thin film bent waveguide |
| title | Analysis of Waveguides on Lithium Niobate Thin Films |
| title_full | Analysis of Waveguides on Lithium Niobate Thin Films |
| title_fullStr | Analysis of Waveguides on Lithium Niobate Thin Films |
| title_full_unstemmed | Analysis of Waveguides on Lithium Niobate Thin Films |
| title_short | Analysis of Waveguides on Lithium Niobate Thin Films |
| title_sort | analysis of waveguides on lithium niobate thin films |
| topic | integrated optics lithium niobate thin film bent waveguide |
| url | http://www.mdpi.com/2073-4352/8/5/191 |
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