Observation of the Inherent Chiral Smith-Purcell Effect via Symmetry Breaking

@misc{zhu2026observation,
  title = {{Observation of the Inherent Chiral Smith-Purcell Effect via Symmetry Breaking}},
  author = {Juan-Feng Zhu and Fei Chen and Jun-Xuan Chen and Junkang Shan and Ayan Nussupbekov and Febiana Tjiptoharsono and Xuan Dong and Mu Wang and Cheng-Wei Qiu and Zhaogang Dong and Ruwen Peng and Lin Wu},
  howpublished = {arXiv},
  year = {2026},
  month = may,
  doi = {10.48550/arxiv.2605.26587},
  eprint = {2605.26587},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.26587},
}

TY  - UNPB
TI  - Observation of the Inherent Chiral Smith-Purcell Effect via Symmetry Breaking
AU  - Juan-Feng Zhu
AU  - Fei Chen
AU  - Jun-Xuan Chen
AU  - Junkang Shan
AU  - Ayan Nussupbekov
AU  - Febiana Tjiptoharsono
AU  - Xuan Dong
AU  - Mu Wang
AU  - Cheng-Wei Qiu
AU  - Zhaogang Dong
AU  - Ruwen Peng
AU  - Lin Wu
PY  - 2026
DA  - 2026/05/27
PB  - arXiv
DO  - 10.48550/arxiv.2605.26587
UR  - https://arxiv.org/abs/2605.26587
AB  - 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.
ER  -