Quantifying coherent and incoherent cathodoluminescence in semiconductors and metals

Brenny, Benjamin J. M.; Coenen, Toon; Polman, A.

doi:10.1063/1.4885426

Cited by 60 publications

(60 citation statements)

References 48 publications

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“…On metal surfaces such impacts also generate surface plasmon polaritons (SPPs) propagating radially from the impact point. Indeed, for certain metals at certain frequencies and electron energies the efficiency of coupling to SPPs may be greater than to TR, but SPPs can only contribute to free-space (far-field) light emission in the presence of a decoupling structure such as a grating; TR is otherwise the dominant output component2122. The TR from an electron normally incident on a metal surface has a cylindrically symmetric toroidal emission pattern (illustrated schematically in Fig.…”

Section: Resultsmentioning

confidence: 99%

Holographic free-electron light source

Clarke

et al. 2016

Nat Commun

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Recent advances in the physics and technology of light generation via free-electron proximity and impact interactions with nanostructures (gratings, photonic crystals, nano-undulators, metamaterials and antenna arrays) have enabled the development of nanoscale-resolution techniques for such applications as mapping plasmons, studying nanoparticle structural transformations and characterizing luminescent materials (including time-resolved measurements). Here, we introduce a universal approach allowing generation of light with prescribed wavelength, direction, divergence and topological charge via point-excitation of holographic plasmonic metasurfaces. It is illustrated using medium-energy free-electron injection to generate highly-directional visible to near-infrared light beams, at selected wavelengths in prescribed azimuthal and polar directions, with brightness two orders of magnitude higher than that from an unstructured surface, and vortex beams with topological charge up to ten. Such emitters, with micron-scale dimensions and the freedom to fully control radiation parameters, offer novel applications in nano-spectroscopy, nano-chemistry and sensing.

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Section: Resultsmentioning

confidence: 99%

Holographic free-electron light source

Clarke

et al. 2016

Nat Commun

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“…Figure 2 a shows a CL spectrum taken from a bulk gallium arsenide crystal measured using our CL setup showing the characteristic bandedge emission at λ 0 = 870 nm. 11 The measured azimuthally-averaged angular emission distribution around λ 0 = 870 nm is shown in Figure 2b . A Lambertian angular profi le is found, consistent with an isotropic emission distribution within the GaAs crystal (see inset in Figure 2a ).…”

Section: Cathodoluminescence Imaging Instrumentmentioning

confidence: 99%

Cathodoluminescence microscopy: Optical imaging and spectroscopy with deep-subwavelength resolution

et al. 2015

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This article describes a new microscope, based on angle-resolved cathodoluminescence (CL) imaging spectroscopy, which enables optical imaging and spectroscopy at deepsubwavelength spatial resolution. We used a free electron beam in a scanning electron microscope as a direct excitation source for polarizable materials, and we collected the emitted coherent visible/infrared CL radiation using a specially designed optical collection system that is integrated in the electron microscope. We have demonstrated the use of this new technique for the excitation of plasmons in single metal nanoparticles, surface plasmon polaritons at metal surfaces, resonant Mie modes in dielectric nanostructures, and cavity modes and Bloch modes in photonic crystals. Using angle-resolved detection, we are able to derive the nature of localized modes and the dispersion of propagation modes in dielectric and plasmonic geometries. An outlook about new directions and applications of CL imaging spectroscopy is also provided.

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“…7). If angle resolved CL can be performed by imaging the light collected from a mirror using a 2D CCD camera then the coherent and incoherent contributions can be further separated as described in [36] for SEM-CL. Angle resolved CL has been carried out in the TEM by Yamamoto et al [37] using a larger mirror than ours in a 15 mm pole piece gap microscope.…”

Section: Implications For Tem-cl Measurementsmentioning

confidence: 99%

The role of transition radiation in cathodoluminescence imaging and spectroscopy of thin-foils

Mendis

Howkins

Stowe³

et al. 2016

Ultramicroscopy

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Quantifying coherent and incoherent cathodoluminescence in semiconductors and metals

Abstract: Characterization of carrier concentration and stress in GaAs metal-semiconductor field-effect transistor by cathodoluminescence spectroscopy

Cited by 60 publications

References 48 publications

Holographic free-electron light source

Holographic free-electron light source

Cathodoluminescence microscopy: Optical imaging and spectroscopy with deep-subwavelength resolution

The role of transition radiation in cathodoluminescence imaging and spectroscopy of thin-foils

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