{"date_updated":"2026-04-27T09:10:26Z","ddc":["530"],"language":[{"iso":"eng"}],"publication":"Nature","article_processing_charge":"No","status":"public","external_id":{"arxiv":["2110.03550"],"pmid":["36600060"]},"year":"2023","type":"journal_article","day":"04","OA_type":"green","month":"01","publisher":"Springer Nature","title":"Photonic flatband resonances for free-electron radiation","oa_version":"Preprint","publication_status":"published","abstract":[{"lang":"eng","text":"Flatbands have become a cornerstone of contemporary condensed-matter physics\r\nand photonics. In electronics, flatbands entail comparable energy bandwidth and\r\nCoulomb interaction, leading to correlated phenomena such as the fractional\r\nquantum Hall effect and recently those in magic-angle systems. In photonics, they\r\nenable properties including slow light1 and lasing2. Notably, flatbands support\r\nsupercollimation—diffractionless wavepacket propagation—in both systems3,4.\r\nDespite these intense parallel efforts, flatbands have never been shown to affect the\r\ncore interaction between free electrons and photons. Their interaction, pivotal for\r\nfree-electron lasers5, microscopy and spectroscopy6,7, and particle accelerators8,9,\r\nis, in fact, limited by a dimensionality mismatch between localized electrons and\r\nextended photons. Here we reveal theoretically that photonic flatbands can overcome\r\nthis mismatch and thus remarkably boost their interaction. We design flatband\r\nresonances in a silicon-on-insulator photonic crystal slab to control and enhance the\r\nassociated free-electron radiation by tuning their trajectory and velocity. We observe\r\nsignatures of flatband enhancement, recording a two-order increase from the\r\nconventional diffraction-enabled Smith–Purcell radiation. The enhancement enables\r\npolarization shaping of free-electron radiation and characterization of photonic\r\nbands through electron-beam measurements. Our results support the use of\r\nflatbands as test beds for strong light–electron interaction, particularly relevant for\r\nefficient and compact free-electron light sources and accelerators."}],"pmid":1,"quality_controlled":"1","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2110.03550"}],"page":"42-47","publication_identifier":{"issn":["0028-0836"],"eissn":["1476-4687"]},"volume":613,"article_type":"original","intvolume":"       613","user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd","date_published":"2023-01-04T00:00:00Z","oa":1,"citation":{"ieee":"Y. Yang <i>et al.</i>, “Photonic flatband resonances for free-electron radiation,” <i>Nature</i>, vol. 613. Springer Nature, pp. 42–47, 2023.","ista":"Yang Y, Roques-Carmes C, Kooi SE, Tang H, Beroz J, Mazur E, Kaminer I, Joannopoulos JD, Soljačić M. 2023. Photonic flatband resonances for free-electron radiation. Nature. 613, 42–47.","apa":"Yang, Y., Roques-Carmes, C., Kooi, S. E., Tang, H., Beroz, J., Mazur, E., … Soljačić, M. (2023). Photonic flatband resonances for free-electron radiation. <i>Nature</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41586-022-05387-5\">https://doi.org/10.1038/s41586-022-05387-5</a>","ama":"Yang Y, Roques-Carmes C, Kooi SE, et al. Photonic flatband resonances for free-electron radiation. <i>Nature</i>. 2023;613:42-47. doi:<a href=\"https://doi.org/10.1038/s41586-022-05387-5\">10.1038/s41586-022-05387-5</a>","chicago":"Yang, Yi, Charles Roques-Carmes, Steven E. Kooi, Haoning Tang, Justin Beroz, Eric Mazur, Ido Kaminer, John D. Joannopoulos, and Marin Soljačić. “Photonic Flatband Resonances for Free-Electron Radiation.” <i>Nature</i>. Springer Nature, 2023. <a href=\"https://doi.org/10.1038/s41586-022-05387-5\">https://doi.org/10.1038/s41586-022-05387-5</a>.","short":"Y. Yang, C. Roques-Carmes, S.E. Kooi, H. Tang, J. Beroz, E. Mazur, I. Kaminer, J.D. Joannopoulos, M. Soljačić, Nature 613 (2023) 42–47.","mla":"Yang, Yi, et al. “Photonic Flatband Resonances for Free-Electron Radiation.” <i>Nature</i>, vol. 613, Springer Nature, 2023, pp. 42–47, doi:<a href=\"https://doi.org/10.1038/s41586-022-05387-5\">10.1038/s41586-022-05387-5</a>."},"arxiv":1,"_id":"21547","scopus_import":"1","OA_place":"repository","date_created":"2026-03-30T12:22:47Z","doi":"10.1038/s41586-022-05387-5","author":[{"full_name":"Yang, Yi","first_name":"Yi","last_name":"Yang"},{"full_name":"Roques-Carmes, Charles","id":"e2e68fc9-6505-11ef-a541-eb4e72cc3e82","first_name":"Charles","last_name":"Roques-Carmes"},{"first_name":"Steven E.","last_name":"Kooi","full_name":"Kooi, Steven E."},{"last_name":"Tang","first_name":"Haoning","full_name":"Tang, Haoning"},{"last_name":"Beroz","first_name":"Justin","full_name":"Beroz, Justin"},{"full_name":"Mazur, Eric","last_name":"Mazur","first_name":"Eric"},{"full_name":"Kaminer, Ido","first_name":"Ido","last_name":"Kaminer"},{"first_name":"John D.","last_name":"Joannopoulos","full_name":"Joannopoulos, John D."},{"full_name":"Soljačić, Marin","last_name":"Soljačić","first_name":"Marin"}],"extern":"1"}