An ultrafast nanotip electron gun triggered by grating-coupled surface plasmons

Schröder, Benjamin; Sivis, Murat; Bormann, Reiner; Schäfer, Sascha; Ropers, Claus

doi:10.1063/1.4937121

Cited by 43 publications

(47 citation statements)

References 54 publications

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“…One is the linear nanogaps; the other is the stacked “double‐layer” nanogaps at the crossing point of lower and upper linear nanogaps. The strongest electric‐field enhancement at the outside corners of the crossing points could be resulted from the adiabatic nanofocusing of the tapered tip 54,55. The resonance in the linear nanogaps that is away from the crossing point is the same with that of the single 1D linear nanogaps.…”

Section: Resultsmentioning

confidence: 99%

Sub‐10 nm Au–Ag Heterogeneous Plasmonic Nanogaps

Zheng

Zhang

et al. 2020

Adv Materials Inter

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Controlling the formation of bimetallic heterogeneous nanogaps structures have many applications in the plasmonics and catalysis fields. Here, a simple and systematic method is developed to fabricate tunable and stable Au–Ag nanowire‐based plasmonic metamaterials. The sub‐10 nm Au–Ag bimetallic heterogeneous nanogaps with desirable optical properties are fabricated by a simple, ultrarapid, and robust nanoskiving technique. Compared to the monometallic linear Ag–Ag and Au–Au nanogaps, the Au–Ag bimetallic heterogeneous nanogaps exhibit remarkable surface enhanced Raman spectroscopy (SERS) enhancement properties due to the nanogaps between the adjacent Au/Ag nanowires, and the Ag/Au bimetallic composite film. In addition, 3D bimetallic heterogeneous nanogaps are built and produce much stronger electric fields than those of the 1D linear nanogaps. The sub‐10 nm Au–Ag heterogeneous nanogaps are promising to be used in SERS substrate, plasmon devices, catalysis, and printed electronics.

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Section: Resultsmentioning

confidence: 99%

Sub‐10 nm Au–Ag Heterogeneous Plasmonic Nanogaps

Zheng

Zhang

et al. 2020

Adv Materials Inter

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“…Metallic nanotips have also recently been employed as miniaturized electron sources in different time-resolved electron microscope set-ups [88,145,146]. The extremely small size of the emitter region results in an exceptionally high beam brightness and excellent coherence properties, which are critical for emerging applications in ultrafast electron diffraction [135].…”

Section: Plasmon Nanofocusing For Ultrafast Electron Microscopymentioning

confidence: 99%

“…Since our first implementation of such a plasmon nanofocusing electron source [87], related work has also been reported in Refs. [88,90].…”

Section: Plasmon Nanofocusing For Ultrafast Electron Microscopymentioning

confidence: 99%

“…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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“…The strong spatio-temporal confinement of the evanescent plasmon field allows for generating peak intensities sufficiently high to drive nonlinear processes such as second-harmonic generation [24,27,29] or four-wave mixing [30]. In particular, it has been suggested [31] and recently demonstrated [32,33] that plasmonic nanofocusing can drive nonlinear electron emission from the apex of a nanotip, building on the earlier demonstration of propagating SPP induced electron emission on flat surfaces termed 'plasmoemission' [34].…”

Section: Introductionmentioning

confidence: 99%

Nanofocused Plasmon-Driven Sub-10 fs Electron Point Source

et al. 2016

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Progress in ultrafast electron microscopy relies on the development of efficient laser-driven electron sources delivering femtosecond electron pulses to the sample. In particular, recent advances employ photoemission from metal nanotips as coherent point-like femtosecond low-energy electron sources. We report the nonlinear emission of ultrashort electron wave packets from a gold nanotip generated by nonlocal excitation and nanofocusing of surface plasmon polaritons. We verify the nanoscale localization of plasmon-induced electron emission by its electrostatic collimation characteristics. With a plasmon polariton pulse duration below 8 fs at the apex, we identify multiphoton photoemission as the underlying emission process. The quantum efficiency of the plasmon-induced emission exceeds that of photoemission from direct apex illumination. We demonstrate the application for plasmon-triggered point-projection imaging of an individual semiconductor nanowire at 3 µm tip-sample distance. Based on numerical simulations we estimate an electron pulse duration at the sample below 10 fs for tip-sample distances up to few micrometers. Plasmon-driven nanolocalized electron emission thus enables femtosecond point-projection microscopy with unprecedented temporal and spatial resolution, femtosecond low-energy electron in-line holography, and opens a new route towards femtosecond scanning tunneling microscopy and spectroscopy.

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An ultrafast nanotip electron gun triggered by grating-coupled surface plasmons

Cited by 43 publications

References 54 publications

Sub‐10 nm Au–Ag Heterogeneous Plasmonic Nanogaps

Sub‐10 nm Au–Ag Heterogeneous Plasmonic Nanogaps

Plasmonic nanofocusing – grey holes for light

Nanofocused Plasmon-Driven Sub-10 fs Electron Point Source

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