Optimization of GaN Bent Waveguides in the Visible Spectrum for Reduced Insertion Loss
The development of GaN-based photonic integrated chips has attracted significant attention for visible light communication systems due to their direct bandgap and excellent optical properties across the visible spectrum. However, achieving compact and efficient light routing through bent waveguides...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-01-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/15/3/151 |
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| author | Wendi Li Huiping Yin Qian Fang Feifei Qin Zheng Shi Yongjin Wang Xin Li |
| author_facet | Wendi Li Huiping Yin Qian Fang Feifei Qin Zheng Shi Yongjin Wang Xin Li |
| author_sort | Wendi Li |
| collection | DOAJ |
| description | The development of GaN-based photonic integrated chips has attracted significant attention for visible light communication systems due to their direct bandgap and excellent optical properties across the visible spectrum. However, achieving compact and efficient light routing through bent waveguides remains challenging due to high insertion losses. This paper presents a comprehensive investigation of GaN bent waveguides optimization for visible light photonic integrated chips. Through systematic simulation analysis, we examined the effects of bending angle, process optimization approaches, and geometric parameters on insertion loss characteristics. The back-side thinning process demonstrates superior performance compared to front-side etching, reducing the insertion loss of 90° bends from 1.80 dB to 0.71 dB. Further optimization using silver reflection layers achieves an insertion loss of 0.57 dB. The optimized structure shows excellent performance in the blue-green spectral range (420–500 nm) with insertion losses below 0.9 dB, providing practical solutions for compact GaN photonic integrated chips in visible light communications. |
| format | Article |
| id | doaj-art-5a35b6bd6fd94f239b8d7d91fa227b13 |
| institution | DOAJ |
| issn | 2079-4991 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj-art-5a35b6bd6fd94f239b8d7d91fa227b132025-08-20T02:48:10ZengMDPI AGNanomaterials2079-49912025-01-0115315110.3390/nano15030151Optimization of GaN Bent Waveguides in the Visible Spectrum for Reduced Insertion LossWendi Li0Huiping Yin1Qian Fang2Feifei Qin3Zheng Shi4Yongjin Wang5Xin Li6GaN Optoelectronic Integration International Cooperation Joint Laboratory of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing 210003, ChinaGaN Optoelectronic Integration International Cooperation Joint Laboratory of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing 210003, ChinaGaN Optoelectronic Integration International Cooperation Joint Laboratory of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing 210003, ChinaGaN Optoelectronic Integration International Cooperation Joint Laboratory of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing 210003, ChinaGaN Optoelectronic Integration International Cooperation Joint Laboratory of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing 210003, ChinaGaN Optoelectronic Integration International Cooperation Joint Laboratory of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing 210003, ChinaGaN Optoelectronic Integration International Cooperation Joint Laboratory of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing 210003, ChinaThe development of GaN-based photonic integrated chips has attracted significant attention for visible light communication systems due to their direct bandgap and excellent optical properties across the visible spectrum. However, achieving compact and efficient light routing through bent waveguides remains challenging due to high insertion losses. This paper presents a comprehensive investigation of GaN bent waveguides optimization for visible light photonic integrated chips. Through systematic simulation analysis, we examined the effects of bending angle, process optimization approaches, and geometric parameters on insertion loss characteristics. The back-side thinning process demonstrates superior performance compared to front-side etching, reducing the insertion loss of 90° bends from 1.80 dB to 0.71 dB. Further optimization using silver reflection layers achieves an insertion loss of 0.57 dB. The optimized structure shows excellent performance in the blue-green spectral range (420–500 nm) with insertion losses below 0.9 dB, providing practical solutions for compact GaN photonic integrated chips in visible light communications.https://www.mdpi.com/2079-4991/15/3/151GaN waveguidebent waveguideinsertion lossback-side thinningvisible light communicationphotonic integrated chips |
| spellingShingle | Wendi Li Huiping Yin Qian Fang Feifei Qin Zheng Shi Yongjin Wang Xin Li Optimization of GaN Bent Waveguides in the Visible Spectrum for Reduced Insertion Loss Nanomaterials GaN waveguide bent waveguide insertion loss back-side thinning visible light communication photonic integrated chips |
| title | Optimization of GaN Bent Waveguides in the Visible Spectrum for Reduced Insertion Loss |
| title_full | Optimization of GaN Bent Waveguides in the Visible Spectrum for Reduced Insertion Loss |
| title_fullStr | Optimization of GaN Bent Waveguides in the Visible Spectrum for Reduced Insertion Loss |
| title_full_unstemmed | Optimization of GaN Bent Waveguides in the Visible Spectrum for Reduced Insertion Loss |
| title_short | Optimization of GaN Bent Waveguides in the Visible Spectrum for Reduced Insertion Loss |
| title_sort | optimization of gan bent waveguides in the visible spectrum for reduced insertion loss |
| topic | GaN waveguide bent waveguide insertion loss back-side thinning visible light communication photonic integrated chips |
| url | https://www.mdpi.com/2079-4991/15/3/151 |
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