Excitation of Terahertz Spoof Surface Plasmons on a Roofed Metallic Grating by an Electron Beam
In this paper, both fundamental SSP modes on a roofed metallic grating and its effective excitation of the bounded SSP mode by an injected electron beam on the structure are numerically examined and investigated in the THz regime. Apart from the bounded SSP mode on the metallic grating with open spa...
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MDPI AG
2024-02-01
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| Online Access: | https://www.mdpi.com/2072-666X/15/3/293 |
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| author | Yongqiang Liu Xutao Zhang Yan Wang He Cai Jinhai Sun Yong Zhu Liangsheng Li |
| author_facet | Yongqiang Liu Xutao Zhang Yan Wang He Cai Jinhai Sun Yong Zhu Liangsheng Li |
| author_sort | Yongqiang Liu |
| collection | DOAJ |
| description | In this paper, both fundamental SSP modes on a roofed metallic grating and its effective excitation of the bounded SSP mode by an injected electron beam on the structure are numerically examined and investigated in the THz regime. Apart from the bounded SSP mode on the metallic grating with open space, the introduced roofed metallic grating can generate a closed waveguide mode that occupies the dispersion region outside the light line. The closed waveguide mode shifts gradually to a higher frequency band with a decreased gap size, while the bounded SSP mode line becomes lower. The effective excitation of the bounded SSP mode on this roofed metallic grating is also implemented and studied by using a particle-in-cell simulation studio. The output SSP power spectrums with various gap sizes by the same electron beam on this roofed metallic grating are obtained and analyzed. The simulation results reveal that the generated SSP spectra show a slight red shift with a decreased gap size. This work on the excitation of the SSP mode using an electron beam can benefit the development of high-power compact THz radiation sources by utilizing the strong near-field confinement of SSPs on metallic gratings. |
| first_indexed | 2024-04-24T18:00:20Z |
| format | Article |
| id | doaj.art-4d1ae067679e488592134d93592dd3d5 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-04-24T18:00:20Z |
| publishDate | 2024-02-01 |
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| series | Micromachines |
| spelling | doaj.art-4d1ae067679e488592134d93592dd3d52024-03-27T13:54:55ZengMDPI AGMicromachines2072-666X2024-02-0115329310.3390/mi15030293Excitation of Terahertz Spoof Surface Plasmons on a Roofed Metallic Grating by an Electron BeamYongqiang Liu0Xutao Zhang1Yan Wang2He Cai3Jinhai Sun4Yong Zhu5Liangsheng Li6National Key Laboratory of Scattering and Radiation, Beijing 100854, ChinaNational Key Laboratory of Scattering and Radiation, Beijing 100854, ChinaNational Key Laboratory of Scattering and Radiation, Beijing 100854, ChinaNational Key Laboratory of Scattering and Radiation, Beijing 100854, ChinaNational Key Laboratory of Scattering and Radiation, Beijing 100854, ChinaNational Key Laboratory of Scattering and Radiation, Beijing 100854, ChinaNational Key Laboratory of Scattering and Radiation, Beijing 100854, ChinaIn this paper, both fundamental SSP modes on a roofed metallic grating and its effective excitation of the bounded SSP mode by an injected electron beam on the structure are numerically examined and investigated in the THz regime. Apart from the bounded SSP mode on the metallic grating with open space, the introduced roofed metallic grating can generate a closed waveguide mode that occupies the dispersion region outside the light line. The closed waveguide mode shifts gradually to a higher frequency band with a decreased gap size, while the bounded SSP mode line becomes lower. The effective excitation of the bounded SSP mode on this roofed metallic grating is also implemented and studied by using a particle-in-cell simulation studio. The output SSP power spectrums with various gap sizes by the same electron beam on this roofed metallic grating are obtained and analyzed. The simulation results reveal that the generated SSP spectra show a slight red shift with a decreased gap size. This work on the excitation of the SSP mode using an electron beam can benefit the development of high-power compact THz radiation sources by utilizing the strong near-field confinement of SSPs on metallic gratings.https://www.mdpi.com/2072-666X/15/3/293spoof surface plasmons (SSPs)roofed metallic gratingleaky wave SSP modeterahertz radiation sourceelectron beamhigh-power excitation |
| spellingShingle | Yongqiang Liu Xutao Zhang Yan Wang He Cai Jinhai Sun Yong Zhu Liangsheng Li Excitation of Terahertz Spoof Surface Plasmons on a Roofed Metallic Grating by an Electron Beam Micromachines spoof surface plasmons (SSPs) roofed metallic grating leaky wave SSP mode terahertz radiation source electron beam high-power excitation |
| title | Excitation of Terahertz Spoof Surface Plasmons on a Roofed Metallic Grating by an Electron Beam |
| title_full | Excitation of Terahertz Spoof Surface Plasmons on a Roofed Metallic Grating by an Electron Beam |
| title_fullStr | Excitation of Terahertz Spoof Surface Plasmons on a Roofed Metallic Grating by an Electron Beam |
| title_full_unstemmed | Excitation of Terahertz Spoof Surface Plasmons on a Roofed Metallic Grating by an Electron Beam |
| title_short | Excitation of Terahertz Spoof Surface Plasmons on a Roofed Metallic Grating by an Electron Beam |
| title_sort | excitation of terahertz spoof surface plasmons on a roofed metallic grating by an electron beam |
| topic | spoof surface plasmons (SSPs) roofed metallic grating leaky wave SSP mode terahertz radiation source electron beam high-power excitation |
| url | https://www.mdpi.com/2072-666X/15/3/293 |
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