Broadband On-Chip Directional Coupler with Oblique Nanoslits
Directional coupling of light at the nanoscale plays a significant role in both fundamental research and practical applications, which are crucial for the development of on-chip photonic devices. In this work, we propose a broadband directional coupler for surface plasmon polaritons (SPPs) utilizing...
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MDPI AG
2025-03-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/12/3/289 |
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| author | Can Chen Qingfang Wang Jinzhan Zhong Xinrui Lei Qiwen Zhan |
| author_facet | Can Chen Qingfang Wang Jinzhan Zhong Xinrui Lei Qiwen Zhan |
| author_sort | Can Chen |
| collection | DOAJ |
| description | Directional coupling of light at the nanoscale plays a significant role in both fundamental research and practical applications, which are crucial for the development of on-chip photonic devices. In this work, we propose a broadband directional coupler for surface plasmon polaritons (SPPs) utilizing a pair of obliquely perforated nanoslits. We demonstrate that tilting the slits significantly enhances the sensitivity of plasmonic coupling phase variation to the wavelength of the incident light, enabling precise wavelength-dependent control over SPP propagation. By optimizing the width and tilting angle of each nanoslit, we achieve an extinction ratio exceeding 10 dB with a bandwidth exceeding 400 nm and a maximum unidirectional transmission of up to 30 dB. This broadband directional SPP coupler presents a promising platform for the design and fabrication of integrated plasmonic circuits and high-performance optical devices and sensors. |
| format | Article |
| id | doaj-art-ecc7bfed2bd84f0e9f19e1303f12647f |
| institution | OA Journals |
| issn | 2304-6732 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj-art-ecc7bfed2bd84f0e9f19e1303f12647f2025-08-20T01:48:54ZengMDPI AGPhotonics2304-67322025-03-0112328910.3390/photonics12030289Broadband On-Chip Directional Coupler with Oblique NanoslitsCan Chen0Qingfang Wang1Jinzhan Zhong2Xinrui Lei3Qiwen Zhan4School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaSchool of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaSchool of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaSchool of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaSchool of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaDirectional coupling of light at the nanoscale plays a significant role in both fundamental research and practical applications, which are crucial for the development of on-chip photonic devices. In this work, we propose a broadband directional coupler for surface plasmon polaritons (SPPs) utilizing a pair of obliquely perforated nanoslits. We demonstrate that tilting the slits significantly enhances the sensitivity of plasmonic coupling phase variation to the wavelength of the incident light, enabling precise wavelength-dependent control over SPP propagation. By optimizing the width and tilting angle of each nanoslit, we achieve an extinction ratio exceeding 10 dB with a bandwidth exceeding 400 nm and a maximum unidirectional transmission of up to 30 dB. This broadband directional SPP coupler presents a promising platform for the design and fabrication of integrated plasmonic circuits and high-performance optical devices and sensors.https://www.mdpi.com/2304-6732/12/3/289nanoantennasurface plasmon polaritonsdirectional scattering |
| spellingShingle | Can Chen Qingfang Wang Jinzhan Zhong Xinrui Lei Qiwen Zhan Broadband On-Chip Directional Coupler with Oblique Nanoslits Photonics nanoantenna surface plasmon polaritons directional scattering |
| title | Broadband On-Chip Directional Coupler with Oblique Nanoslits |
| title_full | Broadband On-Chip Directional Coupler with Oblique Nanoslits |
| title_fullStr | Broadband On-Chip Directional Coupler with Oblique Nanoslits |
| title_full_unstemmed | Broadband On-Chip Directional Coupler with Oblique Nanoslits |
| title_short | Broadband On-Chip Directional Coupler with Oblique Nanoslits |
| title_sort | broadband on chip directional coupler with oblique nanoslits |
| topic | nanoantenna surface plasmon polaritons directional scattering |
| url | https://www.mdpi.com/2304-6732/12/3/289 |
| work_keys_str_mv | AT canchen broadbandonchipdirectionalcouplerwithobliquenanoslits AT qingfangwang broadbandonchipdirectionalcouplerwithobliquenanoslits AT jinzhanzhong broadbandonchipdirectionalcouplerwithobliquenanoslits AT xinruilei broadbandonchipdirectionalcouplerwithobliquenanoslits AT qiwenzhan broadbandonchipdirectionalcouplerwithobliquenanoslits |