Single-electron nano-chip free-electron laser
A conventional free-electron laser is useful but large, driven by a beam with many relativistic electrons. Although, recently, keV electron beams have been used to excite broadband radiation from material chips, there remains a quest for a chip-size free-electron laser capable of emitting coherent r...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2022-09-01
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| Series: | APL Photonics |
| Online Access: | http://dx.doi.org/10.1063/5.0097486 |
| _version_ | 1811204938932420608 |
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| author | Yen-Chieh Huang Luo-Hao Peng Hossein Shirvani Wen-Chi Chen Karthickraj Muthuramalingam Wei-Chih Wang Andrzej Szczepkowicz |
| author_facet | Yen-Chieh Huang Luo-Hao Peng Hossein Shirvani Wen-Chi Chen Karthickraj Muthuramalingam Wei-Chih Wang Andrzej Szczepkowicz |
| author_sort | Yen-Chieh Huang |
| collection | DOAJ |
| description | A conventional free-electron laser is useful but large, driven by a beam with many relativistic electrons. Although, recently, keV electron beams have been used to excite broadband radiation from material chips, there remains a quest for a chip-size free-electron laser capable of emitting coherent radiation. Unfortunately, those keV emitters from electron microscopes or dielectric laser accelerators usually deliver a small current with discrete moving electrons separated by a distance of a few or tens of microns. To envisage a chip-size free-electron laser as a powerful research tool, we study in this paper achievable laser radiation from a single electron and an array of single electrons atop a nano-grating dielectric waveguide. In our study, thanks to the strong coupling between the electron and the guided wave in a structure with distributed feedback, a single 50-keV electron generates 1.5-µm laser-like radiation at the Bragg resonance of a 31-µm long silicon grating with a 400-nm thickness and 310-nm period. When driven by a train of single electrons repeating at 0.1 PHz, the nano-grating waveguide emits strong laser radiation at the second harmonic of the excitation frequency. A discrete spectrum of Smith–Purcell radiation mediated by the waveguide modes is also predicted in theory and observed from simulation in the vacuum space above the grating waveguide. This study opens up the opportunity for applications requiring combined advantages from compact high-brightness electron and photon sources. |
| first_indexed | 2024-04-12T03:22:12Z |
| format | Article |
| id | doaj.art-a730aa74c252462ea2547b9d69ea4d7b |
| institution | Directory Open Access Journal |
| issn | 2378-0967 |
| language | English |
| last_indexed | 2024-04-12T03:22:12Z |
| publishDate | 2022-09-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Photonics |
| spelling | doaj.art-a730aa74c252462ea2547b9d69ea4d7b2022-12-22T03:49:52ZengAIP Publishing LLCAPL Photonics2378-09672022-09-0179096101096101-1010.1063/5.0097486Single-electron nano-chip free-electron laserYen-Chieh Huang0Luo-Hao Peng1Hossein Shirvani2Wen-Chi Chen3Karthickraj Muthuramalingam4Wei-Chih Wang5Andrzej Szczepkowicz6Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, TaiwanInstitute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, TaiwanInstitute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, TaiwanInstitute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, TaiwanInstitute of Nanoengineering and MicroSystems, Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30013, TaiwanInstitute of Nanoengineering and MicroSystems, Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30013, TaiwanInstitute of Experimental Physics, University of Wroclaw, Plac M. Borna 9, 50-204 Wroclaw, PolandA conventional free-electron laser is useful but large, driven by a beam with many relativistic electrons. Although, recently, keV electron beams have been used to excite broadband radiation from material chips, there remains a quest for a chip-size free-electron laser capable of emitting coherent radiation. Unfortunately, those keV emitters from electron microscopes or dielectric laser accelerators usually deliver a small current with discrete moving electrons separated by a distance of a few or tens of microns. To envisage a chip-size free-electron laser as a powerful research tool, we study in this paper achievable laser radiation from a single electron and an array of single electrons atop a nano-grating dielectric waveguide. In our study, thanks to the strong coupling between the electron and the guided wave in a structure with distributed feedback, a single 50-keV electron generates 1.5-µm laser-like radiation at the Bragg resonance of a 31-µm long silicon grating with a 400-nm thickness and 310-nm period. When driven by a train of single electrons repeating at 0.1 PHz, the nano-grating waveguide emits strong laser radiation at the second harmonic of the excitation frequency. A discrete spectrum of Smith–Purcell radiation mediated by the waveguide modes is also predicted in theory and observed from simulation in the vacuum space above the grating waveguide. This study opens up the opportunity for applications requiring combined advantages from compact high-brightness electron and photon sources.http://dx.doi.org/10.1063/5.0097486 |
| spellingShingle | Yen-Chieh Huang Luo-Hao Peng Hossein Shirvani Wen-Chi Chen Karthickraj Muthuramalingam Wei-Chih Wang Andrzej Szczepkowicz Single-electron nano-chip free-electron laser APL Photonics |
| title | Single-electron nano-chip free-electron laser |
| title_full | Single-electron nano-chip free-electron laser |
| title_fullStr | Single-electron nano-chip free-electron laser |
| title_full_unstemmed | Single-electron nano-chip free-electron laser |
| title_short | Single-electron nano-chip free-electron laser |
| title_sort | single electron nano chip free electron laser |
| url | http://dx.doi.org/10.1063/5.0097486 |
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