Enhancing directivity of terahertz photoconductive antennas using spoof surface plasmon structure
Terahertz photoconductive antenna (PCA) is an important device for generating ultrabroadband terahertz radiations, being applicable in various scenarios. However, the metallic electrodes in PCAs, a pair of coplanar strip lines (CSL), always produce horizontal electrode modes in a broad THz band, thu...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/ac8116 |
| _version_ | 1797748401748574208 |
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| author | Chi Wang Zijian Zhang Youfei Zhang Xinrong Xie Yumeng Yang Jiaguang Han Erping Li Hongsheng Chen Jianqiang Gu Wei E I Sha Fei Gao |
| author_facet | Chi Wang Zijian Zhang Youfei Zhang Xinrong Xie Yumeng Yang Jiaguang Han Erping Li Hongsheng Chen Jianqiang Gu Wei E I Sha Fei Gao |
| author_sort | Chi Wang |
| collection | DOAJ |
| description | Terahertz photoconductive antenna (PCA) is an important device for generating ultrabroadband terahertz radiations, being applicable in various scenarios. However, the metallic electrodes in PCAs, a pair of coplanar strip lines (CSL), always produce horizontal electrode modes in a broad THz band, thus resulting in low directivity in the vertical direction. Here, we introduce spoof surface plasmon polariton (SSPP) structures to suppress horizontal electrode modes in a broad band. The suppression principles are accounted to both the forbidden band of the fundamental SSPP mode and the orthogonality between source and higher-order SSPP modes. In the SSPP-modified PCA, we achieve around 2 dBi higher directivity in the vertical direction compared to a typical CSL PCA. Unlike the narrow bands inheriting from conventional metamaterial resonators, the relative operational band of the SSPP-modified PCA is as broad as 48%. This planar SSPP structure is compatible with the well-developed micro fabrication technologies. Thus, our scheme can be combined with the semiconductor material engineering and plasmonic nanoscale structures for further increasing THz output power. |
| first_indexed | 2024-03-12T16:05:12Z |
| format | Article |
| id | doaj.art-0952b292c06f46899fa86adeeddead77 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:05:12Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-0952b292c06f46899fa86adeeddead772023-08-09T14:23:36ZengIOP PublishingNew Journal of Physics1367-26302022-01-0124707304610.1088/1367-2630/ac8116Enhancing directivity of terahertz photoconductive antennas using spoof surface plasmon structureChi Wang0Zijian Zhang1Youfei Zhang2Xinrong Xie3Yumeng Yang4Jiaguang Han5Erping Li6Hongsheng Chen7https://orcid.org/0000-0002-5735-9781Jianqiang Gu8Wei E I Sha9https://orcid.org/0000-0002-7431-8121Fei Gao10https://orcid.org/0000-0001-9928-9390Interdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, College of Information Science and Electronic Engineering, Zhejiang University , Hangzhou 310027, People’s Republic of China; International Joint Innovation Center, Zhejiang University , Haining 314400, People’s Republic of ChinaInterdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, College of Information Science and Electronic Engineering, Zhejiang University , Hangzhou 310027, People’s Republic of China; International Joint Innovation Center, Zhejiang University , Haining 314400, People’s Republic of ChinaInterdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, College of Information Science and Electronic Engineering, Zhejiang University , Hangzhou 310027, People’s Republic of ChinaInterdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, College of Information Science and Electronic Engineering, Zhejiang University , Hangzhou 310027, People’s Republic of China; International Joint Innovation Center, Zhejiang University , Haining 314400, People’s Republic of ChinaInterdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, College of Information Science and Electronic Engineering, Zhejiang University , Hangzhou 310027, People’s Republic of China; International Joint Innovation Center, Zhejiang University , Haining 314400, People’s Republic of ChinaCenter for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University , Tianjin 300072, People’s Republic of ChinaInterdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, College of Information Science and Electronic Engineering, Zhejiang University , Hangzhou 310027, People’s Republic of ChinaInterdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, College of Information Science and Electronic Engineering, Zhejiang University , Hangzhou 310027, People’s Republic of China; International Joint Innovation Center, Zhejiang University , Haining 314400, People’s Republic of ChinaCenter for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University , Tianjin 300072, People’s Republic of ChinaInterdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, College of Information Science and Electronic Engineering, Zhejiang University , Hangzhou 310027, People’s Republic of ChinaInterdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, College of Information Science and Electronic Engineering, Zhejiang University , Hangzhou 310027, People’s Republic of China; International Joint Innovation Center, Zhejiang University , Haining 314400, People’s Republic of ChinaTerahertz photoconductive antenna (PCA) is an important device for generating ultrabroadband terahertz radiations, being applicable in various scenarios. However, the metallic electrodes in PCAs, a pair of coplanar strip lines (CSL), always produce horizontal electrode modes in a broad THz band, thus resulting in low directivity in the vertical direction. Here, we introduce spoof surface plasmon polariton (SSPP) structures to suppress horizontal electrode modes in a broad band. The suppression principles are accounted to both the forbidden band of the fundamental SSPP mode and the orthogonality between source and higher-order SSPP modes. In the SSPP-modified PCA, we achieve around 2 dBi higher directivity in the vertical direction compared to a typical CSL PCA. Unlike the narrow bands inheriting from conventional metamaterial resonators, the relative operational band of the SSPP-modified PCA is as broad as 48%. This planar SSPP structure is compatible with the well-developed micro fabrication technologies. Thus, our scheme can be combined with the semiconductor material engineering and plasmonic nanoscale structures for further increasing THz output power.https://doi.org/10.1088/1367-2630/ac8116metamaterialsspoof surface plasmonsterahertz |
| spellingShingle | Chi Wang Zijian Zhang Youfei Zhang Xinrong Xie Yumeng Yang Jiaguang Han Erping Li Hongsheng Chen Jianqiang Gu Wei E I Sha Fei Gao Enhancing directivity of terahertz photoconductive antennas using spoof surface plasmon structure New Journal of Physics metamaterials spoof surface plasmons terahertz |
| title | Enhancing directivity of terahertz photoconductive antennas using spoof surface plasmon structure |
| title_full | Enhancing directivity of terahertz photoconductive antennas using spoof surface plasmon structure |
| title_fullStr | Enhancing directivity of terahertz photoconductive antennas using spoof surface plasmon structure |
| title_full_unstemmed | Enhancing directivity of terahertz photoconductive antennas using spoof surface plasmon structure |
| title_short | Enhancing directivity of terahertz photoconductive antennas using spoof surface plasmon structure |
| title_sort | enhancing directivity of terahertz photoconductive antennas using spoof surface plasmon structure |
| topic | metamaterials spoof surface plasmons terahertz |
| url | https://doi.org/10.1088/1367-2630/ac8116 |
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