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Light emission by free electrons in photonic time-crystals
Photonic time-crystals (PTCs) are spatially homogeneous media whose electromagnetic susceptibility varies periodically in time, causing temporal reflections and refractions for any wave propagating within the medium. The time-reflected and time-refracted waves interfere, giving rise to Floquet modes...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
National Academy of Sciences
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8833186/ https://www.ncbi.nlm.nih.gov/pubmed/35131857 http://dx.doi.org/10.1073/pnas.2119705119 |
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author | Dikopoltsev, Alex Sharabi, Yonatan Lyubarov, Mark Lumer, Yaakov Tsesses, Shai Lustig, Eran Kaminer, Ido Segev, Mordechai |
author_facet | Dikopoltsev, Alex Sharabi, Yonatan Lyubarov, Mark Lumer, Yaakov Tsesses, Shai Lustig, Eran Kaminer, Ido Segev, Mordechai |
author_sort | Dikopoltsev, Alex |
collection | PubMed |
description | Photonic time-crystals (PTCs) are spatially homogeneous media whose electromagnetic susceptibility varies periodically in time, causing temporal reflections and refractions for any wave propagating within the medium. The time-reflected and time-refracted waves interfere, giving rise to Floquet modes with momentum bands separated by momentum gaps (rather than energy bands and energy gaps, as in photonic crystals). Here, we present a study on the emission of radiation by free electrons in PTCs. We show that a free electron moving in a PTC spontaneously emits radiation, and when associated with momentum-gap modes, the electron emission process is exponentially amplified by the modulation of the refractive index. Moreover, under strong electron–photon coupling, the quantum formulation reveals that the spontaneous emission into the PTC bandgap experiences destructive quantum interference with the emission of the electron into the PTC band modes, leading to suppression of the interdependent emission. Free-electron physics in PTCs offers a platform for studying a plethora of exciting phenomena, such as radiating dipoles moving at relativistic speeds and highly efficient quantum interactions with free electrons. |
format | Online Article Text |
id | pubmed-8833186 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | National Academy of Sciences |
record_format | MEDLINE/PubMed |
spelling | pubmed-88331862022-08-07 Light emission by free electrons in photonic time-crystals Dikopoltsev, Alex Sharabi, Yonatan Lyubarov, Mark Lumer, Yaakov Tsesses, Shai Lustig, Eran Kaminer, Ido Segev, Mordechai Proc Natl Acad Sci U S A Physical Sciences Photonic time-crystals (PTCs) are spatially homogeneous media whose electromagnetic susceptibility varies periodically in time, causing temporal reflections and refractions for any wave propagating within the medium. The time-reflected and time-refracted waves interfere, giving rise to Floquet modes with momentum bands separated by momentum gaps (rather than energy bands and energy gaps, as in photonic crystals). Here, we present a study on the emission of radiation by free electrons in PTCs. We show that a free electron moving in a PTC spontaneously emits radiation, and when associated with momentum-gap modes, the electron emission process is exponentially amplified by the modulation of the refractive index. Moreover, under strong electron–photon coupling, the quantum formulation reveals that the spontaneous emission into the PTC bandgap experiences destructive quantum interference with the emission of the electron into the PTC band modes, leading to suppression of the interdependent emission. Free-electron physics in PTCs offers a platform for studying a plethora of exciting phenomena, such as radiating dipoles moving at relativistic speeds and highly efficient quantum interactions with free electrons. National Academy of Sciences 2022-02-07 2022-02-08 /pmc/articles/PMC8833186/ /pubmed/35131857 http://dx.doi.org/10.1073/pnas.2119705119 Text en Copyright © 2022 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . |
spellingShingle | Physical Sciences Dikopoltsev, Alex Sharabi, Yonatan Lyubarov, Mark Lumer, Yaakov Tsesses, Shai Lustig, Eran Kaminer, Ido Segev, Mordechai Light emission by free electrons in photonic time-crystals |
title | Light emission by free electrons in photonic time-crystals |
title_full | Light emission by free electrons in photonic time-crystals |
title_fullStr | Light emission by free electrons in photonic time-crystals |
title_full_unstemmed | Light emission by free electrons in photonic time-crystals |
title_short | Light emission by free electrons in photonic time-crystals |
title_sort | light emission by free electrons in photonic time-crystals |
topic | Physical Sciences |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8833186/ https://www.ncbi.nlm.nih.gov/pubmed/35131857 http://dx.doi.org/10.1073/pnas.2119705119 |
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