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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2605.26587 |
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| _version_ | 1866916052232830976 |
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| author | Zhu, Juan-Feng Chen, Fei Chen, Jun-Xuan Shan, Junkang Nussupbekov, Ayan Tjiptoharsono, Febiana Dong, Xuan Wang, Mu Qiu, Cheng-Wei Dong, Zhaogang Peng, Ruwen Wu, Lin |
| author_facet | Zhu, Juan-Feng Chen, Fei Chen, Jun-Xuan Shan, Junkang Nussupbekov, Ayan Tjiptoharsono, Febiana Dong, Xuan Wang, Mu Qiu, Cheng-Wei Dong, Zhaogang Peng, Ruwen Wu, Lin |
| contents | The Smith-Purcell effect arises when charged particles move near a periodic structure, emitting radiation. Conventional approaches for generating chiral Smith-Purcell radiation rely on metasurface phase engineering or resonant mode interference, typically producing narrow-band, weakly chiral emission. Here, we introduce a resonance-interference-free mechanism that leverages the properties of the charged particles themselves. Using a non-chiral, non-resonant silicon grating, we demonstrate broadband, tunable Smith-Purcell radiation with high chirality, achieving a record-high degree of polarization of 0.87. This is enabled by converting the transverse spin angular momentum of electron-induced evanescent waves into a longitudinal form, producing opposite chirality at different azimuthal angles. Beam twisting or displacement offers precise control over chirality, paving the way for compact chiral light sources, advanced X-ray imaging, and integrated particle diagnostics platforms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_26587 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Observation of the Inherent Chiral Smith-Purcell Effect via Symmetry Breaking Zhu, Juan-Feng Chen, Fei Chen, Jun-Xuan Shan, Junkang Nussupbekov, Ayan Tjiptoharsono, Febiana Dong, Xuan Wang, Mu Qiu, Cheng-Wei Dong, Zhaogang Peng, Ruwen Wu, Lin Optics Applied Physics The Smith-Purcell effect arises when charged particles move near a periodic structure, emitting radiation. Conventional approaches for generating chiral Smith-Purcell radiation rely on metasurface phase engineering or resonant mode interference, typically producing narrow-band, weakly chiral emission. Here, we introduce a resonance-interference-free mechanism that leverages the properties of the charged particles themselves. Using a non-chiral, non-resonant silicon grating, we demonstrate broadband, tunable Smith-Purcell radiation with high chirality, achieving a record-high degree of polarization of 0.87. This is enabled by converting the transverse spin angular momentum of electron-induced evanescent waves into a longitudinal form, producing opposite chirality at different azimuthal angles. Beam twisting or displacement offers precise control over chirality, paving the way for compact chiral light sources, advanced X-ray imaging, and integrated particle diagnostics platforms. |
| title | Observation of the Inherent Chiral Smith-Purcell Effect via Symmetry Breaking |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2605.26587 |