Fiber optic probe of free electron evanescent fields in the optical frequency range

So, Jin‐Kyu; MacDonald, Kevin F.; Zheludev, Nikolay I.

doi:10.1063/1.4876395

Cited by 18 publications

(13 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such a measurement is particularly interesting for light-electron interactions involving structural defects, or when resolving the dynamics of surface-emitted light. In contrast, other CL setups collect the emitted light with a fiber [18,47] or a parabolic mirror, with the latter allowing angular-resolved CL collection [19,[48][49][50][51]. Yet, despite these techniques, no direct spatially resolved imaging of the light emission has been performed before, to the best of our knowledge.…”

mentioning

confidence: 83%

“…These include the excitation of dipoles in localized resonances and other kinds of CL-related effects [18,[47][48][49][50][51], some coming from atomic transitions of The sample is held so that its surface is almost parallel to the path of the electron beam. The emitted light is collected by an objective, directing the emitted light into an enclosure box holding the rest of the optical setup.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Spectrally and Spatially Resolved Smith-Purcell Radiation in Plasmonic Crystals with Short-Range Disorder

et al. 2017

View full text Add to dashboard Cite

Electrons interacting with plasmonic structures can give rise to resonant excitations in localized plasmonic cavities and to collective excitations in periodic structures. We investigate the presence of resonant features and disorder in the conventional Smith-Purcell effect (electrons interacting with periodic structures) and observe the simultaneous excitation of both the plasmonic resonances and the collective excitations. For this purpose, we introduce a new scanning-electron-microscope-based setup that allows us to probe and directly image new features of electron-photon interactions in nanophotonic structures like plasmonic crystals with strong disorder. Our work creates new possibilities for probing nanostructures with free electrons, with potential applications that include tunable sources of short-wavelength radiation and plasmonic-based particle accelerators.

show abstract

mentioning

confidence: 83%

mentioning

confidence: 99%

Spectrally and Spatially Resolved Smith-Purcell Radiation in Plasmonic Crystals with Short-Range Disorder

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The Smith-Purcell (SP) radiation, observed for visible light in 1953 [1], has been shown to occur in a wide spectral region, from microwaves [2,3] generated using macroscopic gratings, to ultraviolet radiation [4,5] from nanogratings. One foreseen application of this effect would be a highly tunable free-electron light source [6].…”

Section: Introductionmentioning

confidence: 99%

Frequency-domain calculation of Smith-Purcell radiation for metallic and dielectric gratings

Szczepkowicz,

Schachter,

England

2020

Preprint

View full text Add to dashboard Cite

The intensity of Smith-Purcell radiation from metallic and dielectric gratings (silicon, silica) is compared in a frequency-domain simulation. The numerical model is discussed and verified with the Frank-Tamm formula for Cherenkov radiation. For 30 keV electrons, rectangular dielectric gratings are less efficient than their metallic counterpart, by an order of magnitude for silicon, and two orders of magnitude for silica. For all gratings studied, radiation intensity oscillates with grating tooth height due to electromagnetic resonances in the grating. 3D and 2D numerical models are compared.

show abstract

“…In metallic gratings, one expects the emission intensity to be enhanced by the excitation * yamamoto.n.ac@m.titech.ac.jp of surface plasmon polaritons (SPPs), which should provide increased coupling to the incident electrons. The spectral and electron-velocity dependence of the resulting emission has been recently analyzed [20]. In order to generate SPR with sufficient intensity, the electron beam needs to move close to the metal surface, within a short distance compared with the light wavelength.…”

Section: Introductionmentioning

confidence: 99%

Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy

2015

View full text Add to dashboard Cite

We investigate the interplay between geometrical lattice resonances and surface plasmons mediating the emission of Smith-Purcell visible light via angle-resolved cathodoluminescence spectroscopy. We observe strong modulations in the dispersion curves of Smith-Purcell radiation (SPR) when they intersect the surface plasmons of silver gratings using a 200-kV transmission electron microscope. The decay of the plasmons away from the grating is directly probed by controlling the electron-beam position relative to the sample surface with nanometer precision. Our measurements are in excellent agreement with numerical simulations, clearly revealing the presence of characteristic Fano profiles resulting from the interference of the light continuum and the discrete plasmon states for each direction of emission. The intensity anomaly in the SPR emission pattern can be well explained from the geometrical consideration of the intersections between the dispersion planes of the SPR and surface plasmon polariton (SPP). A strong and directional SPR beam can be realized under the condition that the SPR dispersion plane comes in contact with the band edge of the SPP dispersion plane.

show abstract

Fiber optic probe of free electron evanescent fields in the optical frequency range

Cited by 18 publications

References 42 publications

Spectrally and Spatially Resolved Smith-Purcell Radiation in Plasmonic Crystals with Short-Range Disorder

Spectrally and Spatially Resolved Smith-Purcell Radiation in Plasmonic Crystals with Short-Range Disorder

Frequency-domain calculation of Smith-Purcell radiation for metallic and dielectric gratings

Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy

Contact Info

Product

Resources

About