Robust topological valley-locked waveguide transport in photonic heterostructures
Topological valley-locked edge state has arisen a rapidly developing research topic in photonics for its gapless dispersion and immunity against intervalley scattering. However, valley-locked edge state is usually confined around the domain walls of valley photonic crystals (VPhCs) with different to...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-11-01
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| Series: | Results in Physics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379723008598 |
| _version_ | 1827753289164259328 |
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| author | Qiankun Zhang Xiaohua Xing Die Zou Yin Liu Bingxuan Mao Guizhong Zhang Jianquan Yao Chunmei Ouyang Liang Wu |
| author_facet | Qiankun Zhang Xiaohua Xing Die Zou Yin Liu Bingxuan Mao Guizhong Zhang Jianquan Yao Chunmei Ouyang Liang Wu |
| author_sort | Qiankun Zhang |
| collection | DOAJ |
| description | Topological valley-locked edge state has arisen a rapidly developing research topic in photonics for its gapless dispersion and immunity against intervalley scattering. However, valley-locked edge state is usually confined around the domain walls of valley photonic crystals (VPhCs) with different topological invariants, which decreases the flexibility of valley photonic devices and limits its application in on-chip integration. Here we propose a topological valley-locked waveguide (TVLW) with a width degree of freedom (DOF) by using a photonic heterostructure where a VPhC characterized by Dirac cones is sandwiched by two VPhCs with opposite valley Chern numbers. The TVLW is available for the transmission of waveguide states which maintain the properties of momentum-valley locking and robustness to defects. Taking advantage of these properties of TVLWs, we design a topological energy concentrator for field enhancement and a topological power splitter with an arbitrary splitting ratio by introducing the rotation angle of channels as a new DOF. Compared with conventional waveguides, the proposed TVLWs with tunable mode-width are more flexible to interface with the existing photonic devices, which provide broad application prospects in on-chip communication and photonic integrated networks. |
| first_indexed | 2024-03-11T07:34:28Z |
| format | Article |
| id | doaj.art-f10e3db4e0ce407a92357cc9110dcad1 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-03-11T07:34:28Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-f10e3db4e0ce407a92357cc9110dcad12023-11-17T05:26:24ZengElsevierResults in Physics2211-37972023-11-0154107066Robust topological valley-locked waveguide transport in photonic heterostructuresQiankun Zhang0Xiaohua Xing1Die Zou2Yin Liu3Bingxuan Mao4Guizhong Zhang5Jianquan Yao6Chunmei Ouyang7Liang Wu8College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, ChinaCollege of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, ChinaCollege of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, ChinaCollege of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, ChinaCollege of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, ChinaCollege of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, ChinaCollege of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, ChinaCollege of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, ChinaCorresponding author.; College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, ChinaTopological valley-locked edge state has arisen a rapidly developing research topic in photonics for its gapless dispersion and immunity against intervalley scattering. However, valley-locked edge state is usually confined around the domain walls of valley photonic crystals (VPhCs) with different topological invariants, which decreases the flexibility of valley photonic devices and limits its application in on-chip integration. Here we propose a topological valley-locked waveguide (TVLW) with a width degree of freedom (DOF) by using a photonic heterostructure where a VPhC characterized by Dirac cones is sandwiched by two VPhCs with opposite valley Chern numbers. The TVLW is available for the transmission of waveguide states which maintain the properties of momentum-valley locking and robustness to defects. Taking advantage of these properties of TVLWs, we design a topological energy concentrator for field enhancement and a topological power splitter with an arbitrary splitting ratio by introducing the rotation angle of channels as a new DOF. Compared with conventional waveguides, the proposed TVLWs with tunable mode-width are more flexible to interface with the existing photonic devices, which provide broad application prospects in on-chip communication and photonic integrated networks.http://www.sciencedirect.com/science/article/pii/S2211379723008598Topological photonicsValley photonic crystals (VPhCs)Photonic heterostructuresTopological power splitter |
| spellingShingle | Qiankun Zhang Xiaohua Xing Die Zou Yin Liu Bingxuan Mao Guizhong Zhang Jianquan Yao Chunmei Ouyang Liang Wu Robust topological valley-locked waveguide transport in photonic heterostructures Results in Physics Topological photonics Valley photonic crystals (VPhCs) Photonic heterostructures Topological power splitter |
| title | Robust topological valley-locked waveguide transport in photonic heterostructures |
| title_full | Robust topological valley-locked waveguide transport in photonic heterostructures |
| title_fullStr | Robust topological valley-locked waveguide transport in photonic heterostructures |
| title_full_unstemmed | Robust topological valley-locked waveguide transport in photonic heterostructures |
| title_short | Robust topological valley-locked waveguide transport in photonic heterostructures |
| title_sort | robust topological valley locked waveguide transport in photonic heterostructures |
| topic | Topological photonics Valley photonic crystals (VPhCs) Photonic heterostructures Topological power splitter |
| url | http://www.sciencedirect.com/science/article/pii/S2211379723008598 |
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