ArticleNature communications2026
Observation of inherent chiral Smith-Purcell effect via symmetry breaking.
Juan-Feng Zhu, Fei Chen, Jun-Xuan Chen, Junkang Shan, Ayan Nussupbekov, Febiana Tjiptoharsono, Xuan Dong, Mu Wang, Cheng-Wei Qiu, Zhaogang Dong and 2 more
Abstract read
In one paragraphArticle in Nature communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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5 · Who and what moneyAuthors and funding
12 authors.
Fei Chen *National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, Nanjing University, Nanjing, China.ORCID http://orcid.org/0000-0003-2482-2204 Jun-Xuan ChenNational Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, Nanjing University, Nanjing, China.
Junkang ShanNational Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, Nanjing University, Nanjing, China.
Ayan NussupbekovInstitute of Advanced Intelligence and Computing, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore.
Febiana TjiptoharsonoInstitute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore.
Xuan DongScience, Mathematics, and Technology (SMT), Singapore University of Technology and Design (SUTD), Singapore, Singapore.
Mu WangNational Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, Nanjing University, Nanjing, China. muwang@nju.edu.cn.ORCID http://orcid.org/0000-0002-3823-1272 Ruwen PengNational Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, Nanjing University, Nanjing, China. rwpeng@nju.edu.cn.ORCID http://orcid.org/0000-0003-0424-2771 Funding
Agency for Science, Technology and Research (A*STAR) MTC IRG M22K2c0088Agency for Science, Technology and Research (A*STAR) MTC IRG M24N7c0083Ministry of Education - Singapore (MOE) A-8002152-00-00; A-8002458-00-00Ministry of Education - Singapore (MOE) MOE-T2EP50223-0001; MOE-MOET32024-0005; MOE-T2EP50125-0018National Natural Science Foundation of China (National Science Foundation of China) 12234010National Research Foundation Singapore (National Research Foundation-Prime Minister's office, Republic of Singapore) NRF-CRP26-2021-0004; NRF-CRP30-2023-0003National Research Foundation Singapore (National Research Foundation-Prime Minister's office, Republic of Singapore) NRF-CRP26-2021-0004; NRF-CRP31-0007National Research Foundation Singapore (National Research Foundation-Prime Minister's office, Republic of Singapore) NRF-CRP30-2023-0003Singapore University of Technology and Design (SUTD) Kickstarter Initiative SKI 2021-06-05Singapore University of Technology and Design (SUTD) Kickstarter Initiatives SKI 2021-02-14
6 · The paper itselfAbstract
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.
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