Holographic free-electron light source

Li, Guanhai; Clarke, Brendan P.; So, Jin‐Kyu; MacDonald, Kevin F.; Zheludev, Nikolay I.

doi:10.1038/ncomms13705

Cited by 75 publications

(62 citation statements)

References 44 publications

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“…The concepts of holography [28] can be used to design the structuring function s(x) for shaping the complex Smith-Purcell emitted wave form (as was already demonstrated for transition radiation [29]). This can be achieved for example by varying other parameters of the grating structure such as the duty cycle, the ridge height, or the profile shape of the periods.…”

Section: Discussionmentioning

confidence: 99%

Spectral and spatial shaping of Smith-Purcell radiation

et al. 2017

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The Smith-Purcell effect, observed when an electron beam passes in the vicinity of a periodic structure, is a promising platform for the generation of electromagnetic radiation in previously unreachable spectral ranges. However, most of the studies of this radiation were performed on simple periodic gratings, whose radiation spectrum exhibits a single peak and its higher harmonics predicted by a well-established dispersion relation. Here, we propose a method to shape the spatial and spectral far-field distribution of the radiation using complex periodic and aperiodic gratings. We show, theoretically and experimentally, that engineering multiple peak spectra with controlled widths located at desired wavelengths is achievable using Smith-Purcell radiation. Our method opens the way to free-electron-driven sources with tailored angular and spectral responses, and gives rise to focusing functionality for spectral ranges where lenses are unavailable or inefficient.

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Section: Discussionmentioning

confidence: 99%

Spectral and spatial shaping of Smith-Purcell radiation

et al. 2017

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“…Moreover, when the electron beam is focused on the metamaterial elements instead of the solid film, the emission is further enhanced. Recently, it has been demonstrated by the same group that holographic patterns can be exploited to control the directionality, the wavelength, and the polarization state of the generated light in a fully coherent way [149] (Figure 10(c)). Interestingly, generation of optical vortex beams with topological charges of up to 10 has been demonstrated by such holographic patterns.…”

Section: Metamaterial-based Electron-beam-driven Photon Sourcesmentioning

confidence: 99%

Interaction of electron beams with optical nanostructures and metamaterials: from coherent photon sources towards shaping the wave function

Talebi

2017

J. Opt.

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Abstract-Investigating the interaction of electron beams with materials and light has been a field of research since more than a century. The field was advanced theoretically by the raise of quantum mechanics and technically by the introduction of electron microscopes and accelerators. It is possible nowadays to uncover a multitude of information from electron-induced excitations in matter by means of advanced techniques like holography, tomography, and most recently photon-induced near-field electron microscopy. The question is whether the interaction can be controlled in an even more efficient way in order to unravel important questions like modal decomposition of the electron-induced polarization, by performing experiments with better spatial, temporal, and energy resolutions. This review discusses recent advances in controlling the electron and light interactions at the nanoscale. Theoretical and numerical aspects of the interaction of electrons with nanostructures and metamaterials will be discussed, with the aim to understand mechanisms of radiation in interaction of electrons with even more sophisticated structures. Based on these mechanisms of radiation, state-of-the art and novel electrondriven few-photon sources will be discussed. Applications of such sources to gain an understanding of quantum optical effects and also to perform spectral interferometry with electron microscopes will be covered. In an inverse approach, as in the case of the inverse Smith-Purcell effect, laser-induced excitations of nanostructures can cause the electron beams traveling in the near-field of such structures to get accelerated, provided a synchronization criterion is satisfied. This effect is the basis for linear dielectric and metallic electron accelerators. Moreover, acceleration goes along with bunching of the electrons. When single electrons are considered, an efficient design of nanostructures can lead to the shaping of the electron wave function travelling adjacent to them, for example to form attosecond electron pulses or chiral electron wave functions.

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“…Recently surface plasmon polaritons (SPPs) has attracted great interest since it can regulate light in a sub-wavelength field. Among variety of plasmonic devices, the MIM waveguide can spread the SPPs [1,3,4]. Fano resonance can be attained in coupled optical resonator cavity ground on the features of MIM waveguide, which has been experimentally proved in recent researches.…”

Section: Introductionmentioning

confidence: 96%

“…The plasmonic nanosensor is a new type of sub-wavelength device prepared by plasmon polaritons with high sensitivity to surrounding media environment. This SPPs can not only overcome the traditional diffraction limit, but also be manipulated in the nanometer scale [4,8,9], which is beneficial for manufacturing micro-nano devices with unique performance, high miniaturization and integration. Fano resonance originates from the coupling effect between a wide continuous state and a nauw discrete state, resulting in an apparently asymmetric linearity in the spectral response [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Sensing analysis based on fano resonance in arch bridge structure

Dong

Sun

et al. 2018

J. Phys. Commun.

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An arch bridge structure, comprising of a semiring cavity resonator coupled with bus waveguide, has been investigated numerically and theoretically. Due to the interaction of broad bright state and the narrow dark state caused by the semiring cavity and bus waveguide, respectively, fano resonance can be accrued in transmission spectra which possess a sheer asymmetrical profile that can be adjusted by changing the parameters of the structure with the finite-difference time-domain (FDTD) method. A plasmonic nanosensor is devised based on fano resonance in a metal-insulator-metal (MIM) waveguide system, which has a sensitivity of 1500 nm/RIU as well as a figure of merit (FOM) of 5500. Our findings can provide the guidance for fundermental research of nanosensor in highly integrated optical circuits.

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Holographic free-electron light source

Cited by 75 publications

References 44 publications

Spectral and spatial shaping of Smith-Purcell radiation

Spectral and spatial shaping of Smith-Purcell radiation

Interaction of electron beams with optical nanostructures and metamaterials: from coherent photon sources towards shaping the wave function

Sensing analysis based on fano resonance in arch bridge structure

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