On the role of terahertz field acceleration and beaming of surface plasmon generated ultrashort electron pulses

Greig, S. R.; Elezzabi, A. Y.

doi:10.1063/1.4891825

Cited by 9 publications

(7 citation statements)

References 16 publications

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“…Therefore, THz and infrared radiation generated from laser-driven coherent nonlinear polarization is ideally suited for controlling electron pulses, as indicated by simulations (17)(18)(19)(20)(21) and recent experiments on controlling nanoscale photoemission (22) and electron acceleration in a dielectric waveguide (23). Figure 1 depicts the experimental implementation of our THz-field-controlled electron beamline consisting of two functional units, one for pulse compression and one for temporal characterization by streaking (24).…”

mentioning

confidence: 99%

All-optical control and metrology of electron pulses

Kealhofer

Schneider

Ehberger

et al. 2016

Science

306

331

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Short electron pulses are central to time-resolved atomic-scale diffraction and electron microscopy, streak cameras, and free-electron lasers. We demonstrate phase-space control and characterization of 5-picometer electron pulses using few-cycle terahertz radiation, extending concepts of microwave electron pulse compression and streaking to terahertz frequencies. Optical-field control of electron pulses provides synchronism to laser pulses and offers a temporal resolution that is ultimately limited by the rise-time of the optical fields applied. We used few-cycle waveforms carried at 0.3 terahertz to compress electron pulses by a factor of 12 with a timing stability of <4 femtoseconds (root mean square) and measure them by means of field-induced beam deflection (streaking). Scaling the concept toward multiterahertz control fields holds promise for approaching the electronic time scale in time-resolved electron diffraction and microscopy.

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mentioning

confidence: 99%

All-optical control and metrology of electron pulses

Kealhofer

Schneider

Ehberger

et al. 2016

Science

306

331

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“…envelope-phase (CEP) stability and peak fields up to 0.1 V nm −1 [4,5]. Avoiding structural damage encountered at visible frequencies, modern high-field THz sources offer ideal opportunities to study nonlinear, field-driven processes [6,7], including the application of rectified currents in a scanning tunneling microscope [8], control of ultrashort electron pulses [9][10][11] or interband tunneling in semiconductors [12,13]. The process of field emission typically requires higher field strengths of several V nm −1 [14,15].…”

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confidence: 99%

Field emission at terahertz frequencies: AC-tunneling and ultrafast carrier dynamics

2014

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We demonstrate ultrafast terahertz (THz) field emission from a tungsten nanotip enabled by local field enhancement. Characteristic electron spectra which result from acceleration in the THz near-field are found. Employing a dual frequency pump-probe scheme, we temporally resolve different nonlinear photoemission processes induced by coupling near-infrared (NIR) and THz pulses. In the order of increasing THz field strength, we observe THz streaking, THz-induced barrier reduction (Schottky effect) and THz field emission. At intense NIR-excitation, the THz field emission is used as an ultrashort, local probe of hot electron dynamics in the apex. A first application of this scheme indicates a decreased carrier cooling rate in the confined tip geometry. Summarizing the results at various excitation conditions, we present a comprehensive picture of the distinct regimes in ultrafast photoemission in the near-and far-infrared.

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“…Electron-tracking model. The electron-tracking simulation method is detailed elsewhere 48,49 with a detailed description in Supplementary Note 2. Briefly, to model the interaction of primary and SEs with the electromagnetic fields of E SP , electron-tracking code is implemented.…”

Section: Methodsmentioning

confidence: 99%

Nonrelativistic electron–electron Møller scattering in a nonadiabatic tunnel-ionizing surface plasmon field

2020

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Ultrafast processes occurring on nanoscale surfaces can be probed with ultrafast low-energy electron pulses. Specifically, for metallic samples, the interaction of free electrons with surface plasmon fields provides insight into the nanoscale electron dynamics at the surface. Current models and experiments include the interaction of electrons with the sample, but ignore electron-electron and electron-plasmon interactions. Here we show that secondary electrons and their interaction with the incident primary electrons via nonrelativistic Møller scattering in the presence of optical and surface plasmon fields significantly alters the electron dynamics probed with ultrafast low-energy electron microscopy. Modeling this electron-plasmon interaction is key for interpreting ultrafast electron dynamics on metallic surfaces.

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On the role of terahertz field acceleration and beaming of surface plasmon generated ultrashort electron pulses

Cited by 9 publications

References 16 publications

All-optical control and metrology of electron pulses

All-optical control and metrology of electron pulses

Field emission at terahertz frequencies: AC-tunneling and ultrafast carrier dynamics

Nonrelativistic electron–electron Møller scattering in a nonadiabatic tunnel-ionizing surface plasmon field

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