Cavity-mediated electron-photon pairs

Feist, A.; Huang, G.; Arend, G.; Yang, Y.; Henke, J. -W.; Raja, A. S.; Kappert, F. J.; Wang, R. N.; Lourenço-Martins, H.; Qiu, Z.; Liu, J.; Kfir, O.; Kippenberg, T. J.; Ropers, C.

doi:10.48550/arxiv.2202.12821

Cited by 2 publications

(1 citation statement)

References 74 publications

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“…[122][123][124] In particular, in photon-induced near-field electron microscopy [125][126][127] (PINEM), one can probe nearfield non-equilibrium properties of physical systems with un- precedented time and spatial resolution. The recent introduction of nanophotonics in PINEM has enabled the implementation of cavity quantum electrodynamics 22,23 with free electrons, the generation of electron vortex beams, 128 the coherent control of electron beam statistics, 129 electron beam modulation with silicon photonics, 130 coincidence electron-photon detection, 131,132 and strong coupling in the single-photonsingle-electron regime. 133…”

Section: Recent Milestones Enabled By Nanophotonicsmentioning

confidence: 99%

Free-electron-light interactions in nanophotonics

Roques‐Carmes¹,

Kooi²,

Yang³

et al. 2022

Preprint

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When impinging on optical structures or passing in their vicinity, free electrons can spontaneously emit electromagnetic radiation, a phenomenon generally known as cathodoluminescence. Free-electron radiation comes in many guises: Cherenkov, transition, and Smith-Purcell radiation, but also electron scintillation, commonly referred to as incoherent cathodoluminescence. While those effects have been at the heart of many fundamental discoveries and technological developments in high-energy physics in the past century, their recent demonstration in photonic and nanophotonic systems has attracted a lot of attention. Those developments arose from predictions that exploit nanophotonics for novel radiation regimes, now becoming accessible thanks to advances in nanofabrication. In general, the proper design of nanophotonic structures can enable shaping, control, and enhancement of free-electron radiation, for any of the above-mentioned effects. Free-electron radiation in nanophotonics opens the way to promising applications, such as widely-tunable integrated light sources from x-ray to THz frequencies, miniaturized particle accelerators, and highly sensitive high-energy particle detectors. Here, we review the emerging field of free-electron radiation in nanophotonics. We first present a general, unified framework to describe free-electron light-matter interaction in arbitrary nanophotonic systems. We then show how this framework sheds light on the physical underpinnings of many methods in the field used to control and enhance free-electron radiation. Namely, the framework points to the central role played by the photonic eigenmodes in controlling the output properties of free-electron radiation (e.g., frequency, directionality, and polarization). We then review experimental techniques to characterize free-electron radiation in scanning and transmission electron microscopes, which have emerged as the central platforms for experimental realization of the phenomena described in this Review. We further discuss various experimental methods to control and extract spectral, angular, and polarization-resolved information on free-electron radiation. We conclude this Review by outlining novel directions for this field, including ultrafast and quantum effects in free-electron radiation, tunable short-wavelength emitters in the ultraviolet and soft x-ray regimes, and free-electron radiation from topological states in photonic crystals.

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Section: Recent Milestones Enabled By Nanophotonicsmentioning

confidence: 99%

Free-electron-light interactions in nanophotonics

Roques‐Carmes¹,

Kooi²,

Yang³

et al. 2022

Preprint

View full text Add to dashboard Cite

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Efficient coupling between free electrons and the supermode of a silicon slot waveguide

D’Mello¹,

Dahan

Bernal³

et al. 2023

Opt. Express

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Laser light can modulate the kinetic energy spectrum of free electrons and induce extremely high acceleration gradients, which are instrumental to electron microscopy and electron acceleration, respectively. We present a design scheme for a silicon photonic slot waveguide which hosts a supermode to interact with free electrons. The efficiency of this interaction relies on the coupling strength per photon along the interaction length. We predict an optimum value of 0.4266, resulting in the maximum energy gain of 28.27 keV for an optical pulse energy of only 0.22 nJ and duration 1 ps. The acceleration gradient is 1.05 GeV/m, which is lower than the maximum imposed by the damage threshold of Si waveguides. Our scheme shows how the coupling efficiency and energy gain can be maximized without maximizing the acceleration gradient. It highlights the potential of silicon photonics technology in hosting electron-photon interactions with direct applications in free-electron acceleration, radiation sources, and quantum information science.

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Cavity-mediated electron-photon pairs

Cited by 2 publications

References 74 publications

Free-electron-light interactions in nanophotonics

Free-electron-light interactions in nanophotonics

Efficient coupling between free electrons and the supermode of a silicon slot waveguide

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