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dc.contributor.authorYang, Yi
dc.contributor.authorMassuda, Aviram
dc.contributor.authorRoques-Carmes, Charles
dc.contributor.authorKooi, Steven Earl
dc.contributor.authorChristensen, Thomas
dc.contributor.authorJohnson, Steven G.
dc.contributor.authorJoannopoulos, John D.
dc.contributor.authorMiller, Owen D.
dc.contributor.authorKaminer, Ido
dc.contributor.authorSoljacic, Marin
dc.date.accessioned2020-04-14T19:57:30Z
dc.date.available2020-04-14T19:57:30Z
dc.date.issued2018-07
dc.date.submitted2017-12
dc.identifier.issn1745-2473
dc.identifier.issn1745-2481
dc.identifier.urihttps://hdl.handle.net/1721.1/124634
dc.description.abstractFree-electron radiation such as Cerenkov, Smith–Purcell and transition radiation can be greatly affected by structured optical environments, as has been demonstrated in a variety of polaritonic, photonic-crystal and metamaterial systems. However, the amount of radiation that can ultimately be extracted from free electrons near an arbitrary material structure has remained elusive. Here we derive a fundamental upper limit to the spontaneous photon emission and energy loss of free electrons, regardless of geometry, which illuminates the effects of material properties and electron velocities. We obtain experimental evidence for our theory with quantitative measurements of Smith–Purcell radiation. Our framework allows us to make two predictions. One is a new regime of radiation operation—at subwavelength separations, slower (non-relativistic) electrons can achieve stronger radiation than fast (relativistic) electrons. The other is a divergence of the emission probability in the limit of lossless materials. We further reveal that such divergences can be approached by coupling free electrons to photonic bound states in the continuum. Our findings suggest that compact and efficient free-electron radiation sources from microwaves to the soft X-ray regime may be achievable without requiring ultrahigh accelerating voltages.en_US
dc.description.sponsorshipUnited States. Army Research Office. Institute for Soldier Nanotechnologies. (Contract W911NF-18-2-0048)en_US
dc.description.sponsorshipUnited States. Army Research Office. Institute for Soldier Nanotechnologies. (Contract W911NF-13-D-0001)en_US
dc.description.sponsorshipNational Science Foundation (U.S.). Materials Research Science and Engineering Centers (Program) (Grant DMR-1419807)en_US
dc.description.sponsorshipDanish Council for Independent Research (Grant DFFC6108-00667)en_US
dc.publisherSpringer Nature America, Incen_US
dc.relation.isversionofhttp://dx.doi.org/10.1038/S41567-018-0180-2en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceMIT web domainen_US
dc.titleMaximal spontaneous photon emission and energy loss from free electronsen_US
dc.typeArticleen_US
dc.identifier.citationYang, Yi, et al. “Maximal Spontaneous Photon Emission and Energy Loss from Free Electrons.” Nature Physics 14, 9 (July 16, 2018): 894–899. © 2018 The Authorsen_US
dc.contributor.departmentMassachusetts Institute of Technology. Research Laboratory of Electronicsen_US
dc.contributor.departmentMassachusetts Institute of Technology. Institute for Soldier Nanotechnologiesen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Scienceen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Mathematicsen_US
dc.relation.journalNature Physicsen_US
dc.eprint.versionAuthor's final manuscripten_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dc.date.updated2019-03-28T16:55:47Z
dspace.embargo.termsNen_US
dspace.date.submission2019-04-04T12:16:16Z
mit.journal.volume14en_US
mit.journal.issue9en_US
mit.licensePUBLISHER_POLICYen_US
mit.metadata.statusComplete


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