Space‐Time Wave Packets from Smith‐Purcell Radiation

Abstract Space‐time wave packets are electromagnetic waves with strong correlations between their spatial and temporal degrees of freedom. These wave packets have gained much attention for fundamental properties like propagation invariance and user‐designed group velocities, and for potential applic...

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Autores principales:	Yi Ji Tan, Prakash Pitchappa, Nan Wang, Ranjan Singh, Liang Jie Wong
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	electron bunches free electron radiation nanophotonic light sources optical waveshaping space‐time wave packets terahertz Science Q
Acceso en línea:	https://doaj.org/article/2e1f5c8758154138bc84699fa8f0540f
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id	oai:doaj.org-article:2e1f5c8758154138bc84699fa8f0540f
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spelling	oai:doaj.org-article:2e1f5c8758154138bc84699fa8f0540f2021-11-17T08:40:31ZSpace‐Time Wave Packets from Smith‐Purcell Radiation2198-384410.1002/advs.202100925https://doaj.org/article/2e1f5c8758154138bc84699fa8f0540f2021-11-01T00:00:00Zhttps://doi.org/10.1002/advs.202100925https://doaj.org/toc/2198-3844Abstract Space‐time wave packets are electromagnetic waves with strong correlations between their spatial and temporal degrees of freedom. These wave packets have gained much attention for fundamental properties like propagation invariance and user‐designed group velocities, and for potential applications like optical microscopy, micromanipulation, and laser micromachining. Here, free‐electron radiation is presented as a natural and versatile source of space‐time wave packets that are ultra‐broadband and highly tunable in frequency. For instance, ab initio theory and numerical simulations show that the intensity profile of space‐time wave packets from Smith‐Purcell radiation can be directly tailored through the grating properties, as well as the velocity and shape of the electron bunches. The result of this work indicates a viable way of generating space‐time wave packets at exotic frequencies such as the terahertz and X‐ray regimes, potentially paving the way toward new methods of shaping electromagnetic wave packets through free‐electron radiation.Yi Ji TanPrakash PitchappaNan WangRanjan SinghLiang Jie WongWileyarticleelectron bunchesfree electron radiationnanophotonic light sourcesoptical waveshapingspace‐time wave packetsterahertzScienceQENAdvanced Science, Vol 8, Iss 22, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	electron bunches free electron radiation nanophotonic light sources optical waveshaping space‐time wave packets terahertz Science Q
spellingShingle	electron bunches free electron radiation nanophotonic light sources optical waveshaping space‐time wave packets terahertz Science Q Yi Ji Tan Prakash Pitchappa Nan Wang Ranjan Singh Liang Jie Wong Space‐Time Wave Packets from Smith‐Purcell Radiation
description	Abstract Space‐time wave packets are electromagnetic waves with strong correlations between their spatial and temporal degrees of freedom. These wave packets have gained much attention for fundamental properties like propagation invariance and user‐designed group velocities, and for potential applications like optical microscopy, micromanipulation, and laser micromachining. Here, free‐electron radiation is presented as a natural and versatile source of space‐time wave packets that are ultra‐broadband and highly tunable in frequency. For instance, ab initio theory and numerical simulations show that the intensity profile of space‐time wave packets from Smith‐Purcell radiation can be directly tailored through the grating properties, as well as the velocity and shape of the electron bunches. The result of this work indicates a viable way of generating space‐time wave packets at exotic frequencies such as the terahertz and X‐ray regimes, potentially paving the way toward new methods of shaping electromagnetic wave packets through free‐electron radiation.
format	article
author	Yi Ji Tan Prakash Pitchappa Nan Wang Ranjan Singh Liang Jie Wong
author_facet	Yi Ji Tan Prakash Pitchappa Nan Wang Ranjan Singh Liang Jie Wong
author_sort	Yi Ji Tan
title	Space‐Time Wave Packets from Smith‐Purcell Radiation
title_short	Space‐Time Wave Packets from Smith‐Purcell Radiation
title_full	Space‐Time Wave Packets from Smith‐Purcell Radiation
title_fullStr	Space‐Time Wave Packets from Smith‐Purcell Radiation
title_full_unstemmed	Space‐Time Wave Packets from Smith‐Purcell Radiation
title_sort	space‐time wave packets from smith‐purcell radiation
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/2e1f5c8758154138bc84699fa8f0540f
work_keys_str_mv	AT yijitan spacetimewavepacketsfromsmithpurcellradiation AT prakashpitchappa spacetimewavepacketsfromsmithpurcellradiation AT nanwang spacetimewavepacketsfromsmithpurcellradiation AT ranjansingh spacetimewavepacketsfromsmithpurcellradiation AT liangjiewong spacetimewavepacketsfromsmithpurcellradiation
_version_	1718425661561896960

Space‐Time Wave Packets from Smith‐Purcell Radiation

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