Selective strong-field enhancement and suppression of ionization with short laser pulses

Plasmonic resonances in metallic nano-triangles have been investigated by irradiating these structures with short laser pulses and imaging the resulting ablation and melting patterns. The triangular gold structures were prepared on Si substrates and had a thickness of 40 nm and a side length of ca. 500 nm. Irradiation was carried out with single femtosecond and picosecond laser pulses at a wavelength of 800 nm, which excited higher order plasmon modes in these triangles. The ablation distribution as well as the local melting of small parts of the nanostructures reflect the regions of large near-field enhancement. The observed patterns are reproduced in great detail by FDTD simulations with a 3-dimensional model, provided that the calculations are not based on idealized, but on realistic structures. In this realistic model, details like the exact shape of the triangle edges and the dielectric environment of the structures are taken into account. The experimental numbers found for the field enhancement are typically somewhat smaller than the calculated ones. The results demonstrate the caveats for FDTD simulations and the potential and the limitations of “near field photography” by local ablation and melting for the mapping of complex plasmon fields and their applications.

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Wavelength-Dependent Features of Photoelectron Spectra from Nanotip Photoemission

Photonics ◽

10.3390/photonics7040129 ◽

2020 ◽

Vol 7 (4) ◽

pp. 129

Author(s):

Xiao-Yuan Wu ◽

Hao Liang ◽

Marcelo F. Ciappina ◽

Liang-You Peng

Keyword(s):

Strong Field ◽

Field Enhancement ◽

Laser Pulses ◽

High Energy ◽

Classical Trajectory ◽

Photoelectron Spectra ◽

Radius Of Curvature ◽

High Electron ◽

Electron Dynamics ◽

Classical Trajectory Monte Carlo

If a metal nanotip is irradiated with the light of a wavelength much larger than the nanotip’s radius of curvature, optical near-fields become excited. These fields are responsible for distinct strong-field electron dynamics, due to both the field enhancement and spatial localization. By classical trajectory, Monte Carlo (CTMC) simulation, and the integration of the time-dependent Schrödinger equation (TDSE), we find that the photoelectron spectra for nanotip strong-field photoemission, irradiated by mid-infrared laser pulses, present distinctive wavelength-dependent features, especially in the mid- to high-electron energy regions, which are different from the well known ones. By extracting the electron trajectories from the CTMC simulation, we investigate these particular wavelength-dependent features. Our theoretical results contribute to understanding the photoemission and electron dynamics at nanostructures, and pave new pathways for designing high-energy nanometer-sized ultrafast electron sources.

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Nonlinear photoelectron emission from metal surfaces induced by short laser pulses: the effects of field enhancement by surface plasmons

Applied Physics B ◽

10.1007/s00340-011-4582-4 ◽

2011 ◽

Vol 105 (3) ◽

pp. 509-515 ◽

Cited By ~ 11

Author(s):

S. Varró ◽

N. Kroó

Keyword(s):

Surface Plasmons ◽

Metal Surfaces ◽

Field Enhancement ◽

Laser Pulses ◽

Photoelectron Emission ◽

Short Laser Pulses

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UN-CHIRPED SHORT LASER PULSES AMPLIFICATION AND COMPRESSION IN A COMPACT EDFA BASED ON A 3 WT.% ER-DOPED COMPOSITE FIBER

Proceedings of the IX International Conference ”Science and Society - Methods and Problems of Practical Application" ◽

10.29013/ix-conf-canada-9-22-28 ◽

2020 ◽

Author(s):

B. I. Galagan ◽

I. V. Zhluktova ◽

V. A. Kamynin ◽

A. A. Ponosova ◽

S. E. Sverchkov ◽

...

Keyword(s):

Laser Pulses ◽

Composite Fiber ◽

Short Laser Pulses ◽

Er Doped

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Production of ion beams in high-power laser–plasma interactions and their applications

Laser and Particle Beams ◽

10.1017/s0263034604221048 ◽

2004 ◽

Vol 22 (1) ◽

pp. 19-24 ◽

Cited By ~ 21

Author(s):

F. PEGORARO ◽

S. ATZENI ◽

M. BORGHESI ◽

S. BULANOV ◽

T. ESIRKEPOV ◽

...

Keyword(s):

Laser Pulse ◽

Medical Physics ◽

Ion Beam ◽

Laser Pulses ◽

Ion Beams ◽

Laser Plasma Interactions ◽

Physical Mechanisms ◽

Short Laser Pulses ◽

Laser Pulse Intensity ◽

Target Design

Energetic ion beams are produced during the interaction of ultrahigh-intensity, short laser pulses with plasmas. These laser-produced ion beams have important applications ranging from the fast ignition of thermonuclear targets to proton imaging, deep proton lithography, medical physics, and injectors for conventional accelerators. Although the basic physical mechanisms of ion beam generation in the plasma produced by the laser pulse interaction with the target are common to all these applications, each application requires a specific optimization of the ion beam properties, that is, an appropriate choice of the target design and of the laser pulse intensity, shape, and duration.

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