Tunable Free-electron X-ray Radiation From van der Waals Materials

Shentcis, Michael; Budniak, Adam K.; Dahan, Raphael; Kurman, Yaniv; Shi, Xihang; Kalina, Michael; Sheinfux, Hanan Herzig; Blei, Mark; Svendsen, Mark Kamper; Amouyal, Yaron; Tongay, Sefaattin; Thygesen, Kristian Sommer; Lifshitz, E.M.; Abajo, Javier García de; Wong, Liang Jie; Kaminer, Ido

doi:10.1364/cleo_qels.2020.ff1q.7

Cited by 5 publications

(14 citation statements)

References 7 publications

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“…the particle velocity can be determined with high accuracy by measuring the Cherenkov angle of emitted photons [4][5][6][7][8][9]. Emerging communication applications call for a route map towards the miniaturization of Cherenkov devices [10][11][12][13][14][15]. However, the major challenge to scale down Cherenkov detectors arises from the large footprint of photon detection apparatus.…”

Section: Introductionmentioning

confidence: 99%

Surface Dyakonov–Cherenkov radiation

Lin

Wong

et al. 2022

eLight

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Recent advances in engineered material technologies (e.g., photonic crystals, metamaterials, plasmonics, etc.) provide valuable tools to control Cherenkov radiation. In all these approaches, however, the particle velocity is a key parameter to affect Cherenkov radiation in the designed material, while the influence of the particle trajectory is generally negligible. Here, we report on surface Dyakonov–Cherenkov radiation, i.e. the emission of directional Dyakonov surface waves from a swift charged particle moving atop a birefringent crystal. This new type of Cherenkov radiation is highly susceptible to both the particle velocity and trajectory, e.g. we observe a sharp radiation enhancement when the particle trajectory falls in the vicinity of a particular direction. Moreover, close to the Cherenkov threshold, such a radiation enhancement can be orders of magnitude higher than that obtained in traditional Cherenkov detectors. These distinct properties allow us to determine simultaneously the magnitude and direction of particle velocities on a compact platform. The surface Dyakonov–Cherenkov radiation studied in this work not only adds a new degree of freedom for particle identification, but also provides an all-dielectric route to construct compact Cherenkov detectors with enhanced sensitivity.

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Section: Introductionmentioning

confidence: 99%

Surface Dyakonov–Cherenkov radiation

Lin

Wong

et al. 2022

eLight

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“…laser sources, which typically requires the sometimes painstaking development of new materials emitting at the wavelength of interest. Specifically, nanophotonic structures pumped by freeelectron beams have been shown to emit photons in hard-toreach regimes, such as UV, 99,[110][111][112][113] soft x-ray, 21 THz, 114 and mm-wave. 115 Free electrons provide a versatile platform to access parts of the electromagnetic spectrum where few sources are available, utilizing the radiation control and enhancement techniques mentioned above.…”

Section: Recent Milestones Enabled By Nanophotonicsmentioning

confidence: 99%

“…Enhanced free-electron-light interaction (e) Tunable x-ray generation from van der Waals heterostructures, reproduced with permission from Ref. 21 . (f) Backward Cherenkov emission in PhCs, reproduced with permission from Ref.…”

Section: Integrated Tunable Sourcesmentioning

confidence: 99%

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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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Boosting the efficiency of Smith-Purcell radiators using nanophotonic inverse design

Haeusler,

Seidling,

Yousefi

et al. 2021

Preprint

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The generation of radiation from free electrons passing a grating, known as Smith-Purcell radiation, finds various applications including non-destructive beam diagnostics [1-3] and tunable light sources [4][5][6][7][8], ranging from terahertz [9-12] towards X-rays [13,14]. So far, the gratings used for this purpose have been designed manually, based on human intuition and simple geometric shapes.Here we apply the computer-based technique of nanophotonic inverse design to build a 1400 nm Smith-Purcell radiator for sub-relativistic 30 keV electrons. We demonstrate that the resulting silicon nanostructure radiates with a 3-times-higher efficiency and 2.2-times-higher overall power than previously used rectangular gratings. With better fabrication accuracy and for the same electronstructure distance, simulations suggest a superiority by a factor of 96 in peak efficiency. While increasing the efficiency is a key step needed for practical applications of free-electron radiators, inverse design also allows to shape the spectral and spatial emission in ways inaccessible with the human mind [5,7,[15][16][17].

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Tunable Free-electron X-ray Radiation From van der Waals Materials

Cited by 5 publications

References 7 publications

Surface Dyakonov–Cherenkov radiation

Surface Dyakonov–Cherenkov radiation

Free-electron-light interactions in nanophotonics

Boosting the efficiency of Smith-Purcell radiators using nanophotonic inverse design

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