Theory of electron energy loss near plasmonic wires, nanorods, and cones

Yalunin, Sergey V.; Schröder, Benjamin; Ropers, Claus

doi:10.1103/physrevb.93.115408

Cited by 21 publications

(35 citation statements)

References 86 publications

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“…The EFTEM images of the taper region are readily understood by assuming that the electron beam indeed couples mostly to the m = 0 monopole mode of the taper. Recent EELS measurements and simulations [86,89,91] confirm the broadband, non-resonant character of the field enhancement at the taper apex. The observation of oscillations in the spectra recorded at larger distances from the apex was interpreted as a characteristic signature of the excitation of higher order angular momentum modes [86].…”

Section: Plasmonic Eigenmodes Of Circular Wires and Tapersmentioning

confidence: 89%

“…The observation of oscillations in the spectra recorded at larger distances from the apex was interpreted as a characteristic signature of the excitation of higher order angular momentum modes [86]. The formation of standing waves due to the back reflection of SPP modes near the apex may also give rise to spectral oscillations for certain taper geometries, as evidenced in [89,91].…”

Section: Plasmonic Eigenmodes Of Circular Wires and Tapersmentioning

confidence: 95%

“…When coupling ultrafast laser pulses to propagating SPPs at the shaft of those tapers, nanometre-localized light spots with pulse durations as short as 10 fs are created at the taper apex with high efficiency [42,76]. Consequently, the optical properties of such antennas have been studied in considerable detail, both experimentally and theoretically, during the past several years [42,63,64,70,[75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91].…”

Section: Introductionmentioning

confidence: 99%

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Plasmonic nanofocusing – grey holes for light

Groß

Esmann

Becker

et al. 2016

Advances in Physics: X

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Improving the resolution and sensitivity in all-optical microscopy and spectroscopy is inevitably one of the most important challenges in contemporary optical and nanoscience. Here, we discuss a novel approach, plasmonic nanofocusing, towards broadband, coherent all-optical microscopy with ultrahigh temporal and spatial resolution. The conceptual idea is to launch radially symmetric surface plasmon polariton modes onto the shaft of a sharp, conical metal taper. While propagating towards the apex of the pointed taper, the spatial extent of the plasmonic mode gradually shrinks, from several microns in diameter to a spot size of less than 10 nm at the pointed apex of the conical taper. Concomitantly, the local field amplitude of the plasmon mode gradually increases, resulting in a pronounced field enhancement at the apex and -thus -a bright and spatially isolated coherent light source with dimensions far below the diffraction limit. In this review, we characterize the optical properties of such three-dimensional conical metal tapers and demonstrate nanofocusing of radially symmetric plasmon modes. We use this nanolight source for coherent light scattering spectroscopy and demonstrate the sensitivity enhancement resulting from the pronounced spatial field confinement. It is shown that such off-resonant plasmonic nanoantennas facilitate the creation of nanofocused light spots with few-cycle time resolution. As a first application of this ability to nanolocalize ultrashort plasmon wavepackets, we demonstrate remotely-triggered multiphoton-induced photoemission from the very apex of the taper and implement this novel ultrafast electron gun in a point-projection electron microscope. Our results not only indicate the favourable optical properties of this plasmonic nanolens but also suggest that it may find interesting applications in ultrafast scanning optical spectroscopy and might enable new types of ultrafast electron holography and scanning tunnelling microscopy.

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Section: Plasmonic Eigenmodes Of Circular Wires and Tapersmentioning

confidence: 89%

Section: Plasmonic Eigenmodes Of Circular Wires and Tapersmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Plasmonic nanofocusing – grey holes for light

Groß

Esmann

Becker

et al. 2016

Advances in Physics: X

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“…For instance, a SPP propagating along a nano-wedge towards the apex is gradually slowed down as it reaches the apex region [10,11]. For most experimentally accessible wedge parameters, the SPP is however not brought to a complete stop but rather is reflected at the apex [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Near-field study on the transition from localized to propagating plasmons on 2D nano-triangles

Weber¹,

Kiel²,

Irsen³

et al. 2017

Opt. Express

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Abstract:In this manuscript we report on a near field study of two-dimensional plasmonic gold nano-wedges using electron energy loss spectroscopy in combination with scanning transmission electron microscopy, as well as discontinuous Galerkin time-domain computations. With increasing nano-wedge size, we observe a transition from localized surface plasmons on small nano-wedges to non-resonant propagating surface plasmon polaritons on large nano-wedges. Furthermore we demonstrate that nano-wedges with a groove cut can support localized as well as propagating plasmons in the same energy range.

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“…Propagating surface plasmon polaritons (SPPs) enable ultrafast energy transport at metal surfaces on the nanoscale, [1][2][3] facilitating, for example, plasmonic nanocircuits, [4][5][6][7] plasmonic vortices, 8,9 and nanofocusing. [10][11][12][13][14][15] Conical tapers represent the quintessential structure for adiabatic nanofocusing, 10,11,[16][17][18][19] harnessing the efficient coupling of propagating SPPs to a local apex excitation, which is accompanied by a slowing of the SPP group velocity. 10,11,19 The strong confinement of the plasmonic focus gives rise to various linear and nonlinear optical processes, with applications in microscopy and spectroscopy.…”

mentioning

confidence: 99%

Clocking plasmon nanofocusing by THz near-field streaking

Wimmer

Schröder

Sivis

et al. 2017

Applied Physics Letters

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We apply terahertz (THz) near-field streaking in a nanofocusing geometry to investigate plasmon polariton propagation on the shaft of a conical nanotip. By evaluating the delay between a streaking spectrogram for plasmon-induced photoemission with a measurement for direct apex excitation, we obtain an average plasmon group velocity, which is in agreement with numerical simulations. Combining plasmon-induced photoemission with THz near-field streaking facilitates extensive

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Theory of electron energy loss near plasmonic wires, nanorods, and cones

Cited by 21 publications

References 86 publications

Plasmonic nanofocusing – grey holes for light

Plasmonic nanofocusing – grey holes for light

Near-field study on the transition from localized to propagating plasmons on 2D nano-triangles

Clocking plasmon nanofocusing by THz near-field streaking

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