Coherent control at gold needle tips approaching the strong-field regime

Dienstbier, Philip; Paschen, Timo; Hommelhoff, Peter

doi:10.1515/nanoph-2021-0242

Cited by 10 publications

(10 citation statements)

References 41 publications

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“…Taking advantage of the shaper's capability to additionally introduce higher order spectral phase modulation, the trichromatic scheme can be further developed into a powerful tool for coherent control spectroscopy by using sequences of tailored pulses, thus generalizing the concept of 2D spectroscopy. In addition, the tunability of the shaper-generated polarization-controlled multicolor fields makes them attractive for applications in quantum information [222], quantum metrology [109,110,223] and ultrafast nanotechnology [79,178,214,224,225]. In all the experiments reported above, the tailored polarization profile was confined to the (x, y)-plane perpendicular to the propagation direction of the pulse.…”

Section: Discussionmentioning

confidence: 99%

“…The applications of polarization-tailored bichromatic fields are as versatile as their shapes. For example, PLP bichromatic fields were applied to control plasmonenhanced photoemission from silver clusters [178] and strongfield photoemission from gold nanotips [79]. OLP bichromatic fields with commensurable frequencies, characterized by Lissajous-type polarization profiles which exhibit a timevarying optical chirality, have been used to investigate subcycle variations in the PECD of chiral molecules [179,180].…”

Section: Bichromatic Pulse Sequencesmentioning

confidence: 99%

“…The latter work resulted in the experimental demonstration of a new class of cycloidal pulse shapes, such as counterrotating circularly polarized (CRCP) and corotating circularly polarized (COCP) cycloidal fields. In general, polarization-tailored multicolor femtosecond laser fields have opened up new perspectives in numerous applications ranging from HHG [67-72, 74, 75] over the coherent control of ultrafast electron dynamics in atoms and molecules [73,[76][77][78] to the manipulation of coherent excitations in nanostructures [79,80].…”

Section: Introductionmentioning

confidence: 99%

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Multichromatic Polarization-Controlled Pulse Sequences for Coherent Control of Multiphoton Ionization

et al. 2021

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In this review, we report on recent progress in the generation and application of multichromatic polarization-tailored pulse sequences for the coherent control of multiphoton ionization (MPI) dynamics and present unpublished experimental results that complement our previous findings. Specifically, we utilize single-color, bichromatic, and trichromatic polarization-controlled pulse sequences generated by spectral amplitude, phase and polarization modulation of a carrier-envelope phase (CEP)-stable white light supercontinuum for MPI. The analysis of the number of ionization pathways and the number of distinct final free electron states shows that both increase significantly, but scale differently with the number of absorbed photons and the number of pulses in the sequence. In our experiments, ultrafast polarization shaping is combined with high-resolution photoelectron tomography to generate, control, and reconstruct three-dimensional photoelectron momentum distributions from atomic and molecular MPI. We discuss the use of polarization-controlled single-color and bichromatic pulse sequences in perturbative and non-perturbative coherent control of coupled electron-nuclear dynamics in molecules, atomic spin-orbit wave packet dynamics and the directional photoemission from atoms and chiral molecules. We compare the coherent control of CEP-insensitive intraband multipath interference in the MPI with a fixed number of photons with CEP-sensitive interband multipath interference in the ionization with a different number of photons. The generation and control of free electron vortices with even-numbered rotational symmetry by MPI with single-color pulse sequences is contrasted with the bichromatic control of CEP-sensitive electron vortices with odd-numbered rotational symmetry. To illustrate the potential of multichromatic pulse sequences for coherent control, we present a trichromatic scheme for shaper-based quantum state holography.

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Section: Discussionmentioning

confidence: 99%

Section: Bichromatic Pulse Sequencesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multichromatic Polarization-Controlled Pulse Sequences for Coherent Control of Multiphoton Ionization

et al. 2021

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“…The interaction of electrons with intense laser fields of peak optical field strengths larger than 1 GV/m has become a broad, mature research area, , which has opened the exciting fields of attosecond physics and attosecond nanophysics. − The underlying mechanism of inelastic and elastic rescattering of laser-driven electrons with the parent gas atoms or parent solid matter is well-explained by the three-step model (TSM) of strong-field physics. − High-harmonic generation (HHG) can take place, and high-energy electrons can be produced . In the case of metallic nanoemitters, despite being a complex solid-state system, ultrafast and multiphoton emission, − above-threshold photoemission, − and strong-field photoemission ,− have been experimentally demonstrated. Using nanometer sharp needle tips as electron emitters, the existence of local near-field enhancement ,− allows reaching the strong-field photoemission regime without the need for amplifier laser systems with μJ or even greater pulse energies.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Strong-Field Electron Emission and Collective Effects at a One-Dimensional Nanostructure

et al. 2023

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Enhanced near-fields at metallic nanostructures enable the generation of ultrafast nanometric electron pulses and the investigation of fundamental ultrafast dynamics in electron emission. Here we show strong-field induced photoemission from a nanometer-sharp tungsten-covered silicon nanoblade and report the systematic measurement of intensity-dependent electron energy spectra and yields. The observed plateau and cutoff features in the electron spectra indicate the presence of elastic electron rescattering in the enhanced near-fields at the surface of the one-dimensional nanostructure. For the first time, we can hence observe strong-field features from a one-dimensional object, as opposed to zero-dimensional needle tips employed so far. A comparison with results from classical and quantum simulations reveals that the extended geometry of the nanoblades and a cascaded near-field enhancement due to surface roughness leads to a broad energy distribution and high electron energies. A systematic analysis of the electron yield demonstrates nonlinear photoemission at moderate laser intensities and a clear transition to a regime with linear intensity dependence. This distinct feature is interpreted as the onset of space-charge trapping. The presented one-dimensional nanostructure enables us to generate above keV electrons without noticeable target damage and more than 13000 electrons per laser pulse, which is of utmost interest for novel classes of ultrafast photocathodes.

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“…Furthermore, we expect this estimation to also hold for atoms, where the extension of the wave function in vacuum dominates the interaction duration ∆t, which can be varied by changing the height of the ionisation potential. Additionally, the field enhancement factors are determined experimentally in another ongoing work [40], where the field enhancement factors are directly evaluated from the scaling of the cut-off energy in strong-field electron energy spectra. The experimentally obtained field enhancement factors ξ 1560nm = 5.5 ± 0.8 and ξ 780nm = 2.8 ± 0.4, together with Γ 780nm = 1.3 × 10 11 W cm −2 from the fit curve in Fig.…”

mentioning

confidence: 99%

Quantum interference visibility spectroscopy in two-color photoemission from tungsten needle tips

Li,

Pan,

Dienstbier

et al. 2022

Preprint

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When two-color femtosecond laser pulses interact with matter, electrons can be emitted through various multiphoton excitation pathways. Quantum interference between these pathways gives rise to a strong oscillation of the photoemitted electron current, experimentally characterized by its visibility. In this work, we demonstrate two-color visibility spectroscopy of multi-photon photoemission from a solid-state nanoemitter. We investigate the quantum pathway interference visibility over an almost octave-spanning wavelength range of the fundamental (ω) femtosecond laser pulses and their second-harmonic (2ω). The photoemission shows a high visibility of 90% ± 5%, with a remarkably constant distribution. Furthermore, by varying the relative intensity ratio of the two colors, we find that we can vary the visibility between 0 and close to 100%. A simple but highly insightful theoretical model allows us to explain all observations, with excellent quantitative agreements. We expect this work to be universal to all kinds of photo-driven quantum interference, including quantum control in physics, chemistry and quantum engineering.

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Coherent control at gold needle tips approaching the strong-field regime

Cited by 10 publications

References 41 publications

Multichromatic Polarization-Controlled Pulse Sequences for Coherent Control of Multiphoton Ionization

Multichromatic Polarization-Controlled Pulse Sequences for Coherent Control of Multiphoton Ionization

Ultrafast Strong-Field Electron Emission and Collective Effects at a One-Dimensional Nanostructure

Quantum interference visibility spectroscopy in two-color photoemission from tungsten needle tips

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