Prospects in x-ray science emerging from quantum optics and nanomaterials

Wong, Liang Jie; Kaminer, Ido

doi:10.1063/5.0060552

Cited by 24 publications

(20 citation statements)

References 166 publications

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“…Our results should pave the way for the realization of dynamically tunable, compact X-ray sources, which have a wide range of potential applications in imaging and inspection [47][48][49] , including X-ray hyperspectral imaging and X-ray quantum optics [50][51][52][53] . The study of shaping of incident free electrons [54][55][56][57][58][59][60][61][62][63][64] -on the level of either the macroscopic bunch structure or the individual electron wavefunction -is a subject of active investigation that could lead to greater control and enhancement of the output radiation.…”

Section: Discussionmentioning

confidence: 99%

“…[15] Our results should pave the way for the realization of dynamically tunable, compact X-ray sources, which have a wide range of potential applications in imaging and inspection, [49][50][51] including X-ray hyperspectral imaging and X-ray quantum optics. [52][53][54][55] In particular, applications for narrowband X-rays already include X-ray diffraction and near-edge X-ray absorption fine structure measurements. Our source has the potential to serve these applications, but with the added benefits of dynamic photon energy tunability and potentially higher brightness.…”

Section: Discussionmentioning

confidence: 99%

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Enhanced Versatility of Table‐Top X‐Rays from Van der Waals Structures

et al. 2022

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Van der Waals (vdW) materials have attracted much interest for their myriad unique electronic, mechanical and thermal properties. In particular, they are promising candidates for monochromatic, table-top X-ray sources. This work reveals that the versatility of the table-top vdW X-ray source goes beyond what has been demonstrated so far. By introducing a tilt angle between the vdW structure and the incident electron beam, it is theoretically and experimentally shown that the accessible photon energy range is more than doubled. This allows for greater versatility in real-time tuning of the vdW X-ray source. Furthermore, this work shows that the accessible photon energy range is maximized by simultaneously controlling both the electron energy and the vdW structure tilt. These results should pave the way for highly tunable, compact X-ray sources, with potential applications including hyperspectral X-ray fluoroscopy and X-ray quantum optics.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Enhanced Versatility of Table‐Top X‐Rays from Van der Waals Structures

et al. 2022

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“…Those techniques offer an interesting platform to generate x-ray photons with moderately relativistic electrons. [144][145][146][147][148][149] We highlight recent work 21,150 to reveal the similarities and differences between SPR and the previously-mentioned x-ray emission techniques.…”

Section: Smith-purcell Radiationmentioning

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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“…X-ray quantum optics has become a flourishing field of research in last decade [1][2][3][4][5][6] with the developments of the x-ray sources such as high-brilliant synchrotron radiation (SR) [7] and x-ray free electron laser (XFEL) [8], x-ray detection and sample fabrication. Depending on the x-ray intensity, nonlinear and linear quantum phenomena have been extensively studied by XFEL [9][10][11][12][13][14][15][16][17][18] and SR [19][20][21][22][23][24][25] respectively.…”

Section: Introductionmentioning

confidence: 99%

Classical, semi-classical and quantum optical models for x-ray planar cavity with electronic resonance

Huang¹,

Li²,

Lima³

et al. 2022

Preprint

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Here two theoretical models of semi-classical matrix and quantum Green's function are developed for the system of x-ray thin-film planar cavity with inner-shell electronic resonances. The semi-classical model is based on the matrix formalism to treat each layer as the propagating matrix. The crucial idea is to expand the propagating matrix of the resonant atomic layer under ultrathin-film approximation, then derive the analytical expression of the spectral observation, i.e, the cavity reflectance. The typical cavity effects of cavity enhanced decay rate, cavity induced energy shift and the Fano interference which were observed in the recent experiments could be phenomenologically interpreted. The second quantum model employs the analytical Green's function to solve the cavity system. The system Hamiltonian and the effective energy-level are derived. The effective energy-level scheme indicates that the cavity effect acts on the regulation of the intermediated core-hole state.To test the validity of the semi-classical matrix and quantum Green's function models, the classical Parratt's formalism and the dispersion correction of the atomic refractive index are also recalled. Very good agreements in reflectivity spectra between semi-classical and quantum models with the Parratt's results are observed. The present semi-classical matrix and quantum Green's function models will be useful to predict the new phenomena and optimize the cavity structures for future experiments and promote the emerging of quantum optical effects with modern x-ray spectroscopy techniques.

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Prospects in x-ray science emerging from quantum optics and nanomaterials

Cited by 24 publications

References 166 publications

Enhanced Versatility of Table‐Top X‐Rays from Van der Waals Structures

Enhanced Versatility of Table‐Top X‐Rays from Van der Waals Structures

Free-electron-light interactions in nanophotonics

Classical, semi-classical and quantum optical models for x-ray planar cavity with electronic resonance

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