Strong Field Above Threshold Ionization of Rydberg Electrons Localized to a Gold Nanotip

Robin, Jörg; Vogelsang, Jan; Nagy, Benedek J.; Dombi, Péter; Gros, Petra; Lienau, Christoph

doi:10.1364/cleo_qels.2016.fth4b.1

Cited by 1 publication

(1 citation statement)

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“…Although the electronic wavefunctions inside the metal are not localized, an approximation of localized wavefunctions still yields good results when considering ionization from metallic surfaces [8,9,11,12]. Strong near-field enhancement near the nanotips triggers electrons near the Fermi level to tunnel through the surface on a sub-cycle timescale [7,8,[12][13][14][15][16][17][18][19][20][21], which is of particular interest in ultrafast time-resolved electron nanoscopy [12,[21][22][23][24][25]. Interference of the wavepackets tunneled at different cycles gives rise to pronounced peaks in the electron spectra separated by the energy of the pump photons [8,11,12,21].…”

Section: Introductionmentioning

confidence: 99%

Femtosecond field-driven on-chip unidirectional electronic currents in nonadiabatic tunnelling regime

Shi,

Babushkin,

Husakou

et al. 2021

Preprint

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Recently, asymmetric plasmonic nanojunctions [Karnetzky et. al., Nature Comm. 2471, 9 (2018] have shown promise as on-chip electronic devices to convert femtosecond optical pulses to current bursts, with a bandwidth of multi-terahertz scale, although yet at low temperatures and pressures. Such nanoscale devices are of great interest for novel ultrafast electronics and opto-electronic applications. Here, we operate the device in air and at room temperature, revealing the mechanisms of photoemission from plasmonic nanojunctions, and the fundamental limitations on the speed of optical-to-electronic conversion. Inter-cycle interference of coherent electronic wavepackets results in a complex energy electron distribution and birth of multiphoton effects. This energy structure, as well as reshaping of the wavepackets during their propagation from one tip to the other, determine the ultrafast dynamics of the current. We show that, up to some level of approximation, the electron flight time is well-determined by the mean ponderomotive velocity in the driving field.

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