High-order harmonic generation driven by inhomogeneous plasmonics fields spatially bounded: influence on the cut-off law

Neyra, Enrique G.; Videla, Fabiàn; Ciappina, M. F.; Pérez-Hernández, J. A.; Roso, L.; Lewenstein, Maciej; Torchia, G. A.

doi:10.1088/2040-8986/aaa6f7

Cited by 17 publications

(16 citation statements)

References 40 publications

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“…Additionally, from the results corresponding to the inhomogeneous case, a noticeable increasing of the photoelectron yield is also observed. Previously, this effect was observed in the photon flux [23]. In that paper was reported that many electron trajectories did not recombine with their parents ions, so a large direct ATI yield could be expected.…”

Section: Resultsmentioning

confidence: 85%

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Above-threshold ionization driven by few-cycle spatially bounded inhomogeneous laser fields

Rueda¹,

Videla²,

Neyra³

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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In this work we study the main features of the photoelectrons generated when noble gas atoms are driven by spatially bounded inhomogeneous strong laser fields. These spatial inhomogeneous oscillating fields, employed to ionize and accelerate the electrons, result from the interaction between a pulsed low intensity laser and bowtie shaped gold nanostructures. Under this excitation scheme, energy-resolved abovethreshold ionization (ATI) photoelectron spectra have been simulated by solving the one-dimensional (1D) time-dependent Schrödinger equation (TDSE) within the single active electron (SAE) approximation. These quantum mechanical results are supported by their classical counterparts, obtained by the numerical integration of the Newton-Lorentz equation. By using near infrared wavelengths (0.8 − 3 µm) sources, our results show that very high energetic electrons (with kinetic energies in the keV domain) can be generated, far exceeding the limits obtained by using conventional, spatially homogeneous, fields. This new characteristic can be supported considering the nonrecombining electrons trajectories, already reported by Neyra and coworkers (Neyra E, et al. 2018 J. Opt. 20 034002). In order to build a real representation of the spatial dependence of the plasmonic-enhanced field in an analytic function, we fit the generated 'actual' field using two Gaussian functions. We have further analyzed and explored this plasmonic-modified ATI phenomenon in a model argon atom by using several driven wavelengths at intensities in the order of 10 14 W/cm 2 . Throughout our contribution we carefully scrutinize the differences between the ATI obtained using spatially homogeneous and inhomogeneous laser fields. We present the various physical origins, or correspondingly distinct physical mechanisms, for the ATI generation driven by spatially bounded inhomogeneous fields.

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Section: Resultsmentioning

confidence: 85%

“…Additionally, the field distribution is normalized with respect to the strength at point A. The electric field distribution is then constructed by using two Gaussian functions [23]. The maximum associated laser intensity is 3 orders of magnitude larger than the excitation laser intensity, i.e.…”

Section: Resultsmentioning

confidence: 99%

Above-threshold ionization driven by few-cycle spatially bounded inhomogeneous laser fields

Rueda¹,

Videla²,

Neyra³

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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“…the linear term: h(x) = x. This choice is motivated by previous investigations [83,85,86], but nothing prevents to use more general functional forms for h(x) [87]. The actual spatial dependence of the enhanced nearfield in the surrounding of a metal nanostructure can be obtained by solving the Maxwell equations incorporating both the geometry and material properties of the nanosystem under study and the input laser pulse characteristics (see e.g.…”

Section: A Quantum Approachesmentioning

confidence: 99%

“…One of the main advantages of the 1D-TDSE is that we are able to include any functional form for the spatial variation of the plasmonic field. For instance, we have implemented linear [83] and real (parabolic) plasmonic fields [84], as well as near-fields with exponential decay (evanescent fields) [88] and gaussian-like bounded spatially fields [87].…”

Section: A Quantum Approachesmentioning

confidence: 99%

21st Century Nanoscience – A Handbook

Sattler

2019

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Two emerging areas of research, attosecond and nanoscale physics, have recently started to merge. Attosecond physics deals with phenomena occurring when ultrashort laser pulses, with duration on the femto-and sub-femtosecond time scales, interact with atoms, molecules or solids. The laserinduced electron dynamics occurs natively on a timescale down to a few hundred or even tens of attoseconds (1 attosecond=1 as=10 −18 s), which is of the order of the optical field cycle. For comparison, the revolution of an electron on a 1s orbital of a hydrogen atom is ∼ 152 as. On the other hand, the second topic involves the manipulation and engineering of mesoscopic systems, such as solids, metals and dielectrics, with nanometric precision. Although nano-engineering is a vast and well-established research field on its own, the combination with intense laser physics is relatively recent. We present a comprehensive theoretical overview of the tools to tackle and understand the physics that takes place when short and intense laser pulses interact with nanosystems, such as metallic and dielectric nanostructures. In particular we elucidate how the spatially inhomogeneous laser induced fields at a nanometer scale modify the laser-driven electron dynamics. Consequently, this has important impact on pivotal processes such as above-threshold ionization and high-order harmonic generation. The deep understanding of the coupled dynamics between these spatially inhomogeneous fields and matter configures a promising way to new avenues of research and applications. Thanks to the maturity that attosecond physics has reached, together with the tremendous advance in material engineering and manipulation techniques, the age of atto-nano physics has begun, but it is still in an incipient stage.

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“…One year later, J. Armstrong, N. Bloembergen et al [2] published the fundamental paper, dealing with the optical frequency conversion, in which the coupled nonlinear equations were developed and many explicit solutions of these equations were obtained in the framework of the plane wave approximation. During passed decades the SHG was widely observed: in plasma optics [3–5] and nonlinear optics, including high-harmonic generation [6–12], and in a medium containing nanoparticles [13, 14], and in semiconductor [15]. In [16] the SHG at the boundary between dielectric media is analyzed.…”

Section: Introductionmentioning

confidence: 99%

Generalized nonlinear Schrödinger equations describing the Second Harmonic Generation of femtosecond pulse, containing a few cycles, and their integrals of motion

2019

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An interaction of laser pulse, containing a few cycles, with substance is a modern problem, attracting attention of many researches. The frequency conversion is a key problem for a generation of such pulses in various ranges of frequencies. Adequate description of such pulse interaction with a medium is based on a slowly evolving wave approximation (SEWA), which has been proposed earlier for a description of propagation of the laser pulse, containing a few cycles, in a medium with cubic nonlinear response. Despite widely applicability of the frequency conversion for various nonlinear optics problems solutions, SEWA has not been applied and developed for a theoretical investigation of the frequency doubling process until present time. In this study the set of generalized nonlinear Schrödinger equations describing a second harmonic generation of the super-short femtosecond pulse is derived. The equations set contains terms, describing the pulses self-steepening, and the second order dispersion (SOD) of the pulse, a diffraction of the beam as well as mixed derivatives. We propose the transform of the equations set to a type, which does not contain both the mixed derivatives and time derivatives of the nonlinear terms. This transform allows us to derive the integrals of motion of the problem: energy, spectral invariants and Hamiltonian. We show the existence of two specific frequencies (singularities in the Fourier space) inherent to the problem. They may cause an appearance of non-physical absolute instability of the problem solution if the spectral invariants are not taken into account. Moreover, we claim that the energy preservation at the laser pulses propagation may not occur if these invariants do not preserve. Developed conservation laws, in particular, have to be used for developing of the conservative finite-difference schemes, preserving the conservation laws difference analogues, and for developing of adequate theory of the modulation instability of the laser pulses, containing a few cycles.

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High-order harmonic generation driven by inhomogeneous plasmonics fields spatially bounded: influence on the cut-off law

Cited by 17 publications

References 40 publications

Above-threshold ionization driven by few-cycle spatially bounded inhomogeneous laser fields

Above-threshold ionization driven by few-cycle spatially bounded inhomogeneous laser fields

21st Century Nanoscience – A Handbook

Generalized nonlinear Schrödinger equations describing the Second Harmonic Generation of femtosecond pulse, containing a few cycles, and their integrals of motion

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