2018
DOI: 10.1088/1361-6455/aac34f
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High-order above-threshold photoemission from nanotips controlled with two-color laser fields

Abstract: We investigate the process of phase-controlled high-order abovethreshold photoemission from sharp metallic nanotips under bichromatic laser fields. Experimental photoelectron spectra resulting from two-color excitation with a moderately intense near-infrared fundamental field (1560 nm) and its weak second harmonic show a strong sensitivity on the relative phase and clear indications for a plateau-like structure that is attributed to elastic backscattering. To explore the relevant control mechanisms, characteri… Show more

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Cited by 27 publications
(24 citation statements)
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“…These results demonstrate the feasibility of using two-color laser fields for the control of the emission direction of the most energetic electrons from nanoparticles. This observation goes beyond the recently shown two-color control of the cutoff in the electron emission from metallic nanotips [3,4,39].…”
Section: Resultsmentioning
confidence: 57%
See 2 more Smart Citations
“…These results demonstrate the feasibility of using two-color laser fields for the control of the emission direction of the most energetic electrons from nanoparticles. This observation goes beyond the recently shown two-color control of the cutoff in the electron emission from metallic nanotips [3,4,39].…”
Section: Resultsmentioning
confidence: 57%
“…In principle, the presence of the 2ω field component can affect both the magnitude and spatial distribution of the ionization rate as well as the trajectory dynamics of the released electrons. The relative contributions of the effects of the 2ω field on the ionization rate and the trajectory propagation can be revealed by performing a selective activation in the SMM simulations, in analogy to the analysis in [4]. In figure 6 we show (a) the predicted angular and phase-resolved electron cutoff energies with the 2ω field included in the trajectory propagation but neglected in the ionization rate (here just driven by the ω field) and (b) for the 2ω field included in the ionization process, but propagation just driven by the ω field.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…The photocurrent follows a power law of the form P n , where P refers to the laser power and the exponent n refers to the number of photons absorbed. In this multiphoton scheme, more than the minimum required number of photons can be absorbed, referred to as above‐threshold multiphoton photoemission (Figure D). The time scale of the multiphoton photoemission is the same as the width of the laser pulse.…”
Section: Ultrafast Field‐emission Methodologymentioning
confidence: 99%
“…The high contrast was attributed to the quantum-pathway interference between the 4-photon absorption and the 2-photon absorption accompanied by 1-photon absorption of 780 nm. Furthermore, two-color laser field irradiation was found to introduce a quenching of the electron backscattering and the variation of maximum kinetic energy, as shown in Figure 4(b) [92].…”
Section: B Improved Photoelectron Emission In Metallic Nanoprobesmentioning
confidence: 95%