Tunnel and multiphoton ionization of atoms and ions in a strong laser field (Keldysh theory)

Попов, В. С.

doi:10.1070/pu2004v047n09abeh001812

Cited by 500 publications

(403 citation statements)

References 123 publications

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“…For time varying elds, we have used the adiabatic assumption that has proven its validity, for example, in the description of strong eld ionisation in atomic and molecular physics. [100][101][102] Under this assumption, the frequency-dependent currents and elds at the gap can be related through the static conductivity as…”

Section: Effective Medium Within the Qcm: Drude Metals In Vacuummentioning

confidence: 99%

A classical treatment of optical tunneling in plasmonic gaps: extending the quantum corrected model to practical situations

et al. 2015

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(2015). A classical treatment of optical tunneling in plasmonic gaps: extending the quantum corrected model to practical situations. Faraday Discussions, 178, The optical response of plasmonic nanogaps is challenging to address when the separation between the two nanoparticles forming the gap is reduced to a few nanometers or even subnanometer distances. We have compared results of the plasmon response within different levels of approximation, and identified a classical local regime, a nonlocal regime and a quantum regime of interaction. For separations of a fewÅngstroms, in the quantum regime, optical tunneling can occur, strongly modifying the optics of the nanogap. We have considered a classical effective model, so called Quantum Corrected Model (QCM), that has been introduced to correctly describe the main features of optical transport in plasmonic nanogaps. The basics of this model are explained in detail, and its implementation is extended to include nonlocal effects and address practical situations involving different materials and temperatures of operation.

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Section: Effective Medium Within the Qcm: Drude Metals In Vacuummentioning

confidence: 99%

A classical treatment of optical tunneling in plasmonic gaps: extending the quantum corrected model to practical situations

et al. 2015

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“…When an atom or molecule is exposed to an intense laser field, a valence electron can be removed by absorbing several photons (so-called multiphoton ionization) [1,2] or by tunneling through the potential barrier formed by the Coulomb force and the laser field (i.e., tunneling ionization) [3][4][5][6]. According to the Keldysh theory [7], these two ionization mechanisms can be distinguished by the Keldysh parameter γ = I p /2U p , where I p is the ionization potential and U p is the quiver energy of the laser field.…”

Section: Introductionmentioning

confidence: 99%

Analytical model for calibrating laser intensity in strong-field-ionization experiments

Zhao

Jin

et al. 2016

Phys. Rev. A

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The interaction of an intense laser pulse with atoms and molecules depends extremely nonlinearly on the laser intensity. Yet experimentally there still exists no simple reliable methods for determining the peak laser intensity within the focused volume. Here we present a simple method, based on an improved Perelomov-Popov-Terent'ev model, that would allow the calibration of laser intensities from the measured ionization signals of atoms or molecules. The model is first examined by comparing ionization probabilities (or signals) of atoms and several simple diatomic molecules with those from solving the time-dependent Schrödinger equation. We then show the possibility of using this method to calibrate laser intensities for atoms, diatomic molecules as well as large polyatomic molecules, for laser intensities from the multiphoton ionization to tunneling ionization regimes.

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“…It is common to state that such expressions for the tunneling rate have an "exponential accuracy" [42].…”

Section: Nonresonant Interband Transitionsmentioning

confidence: 99%

Ultrafast Control of Strong-Field Electron Dynamics in Solids

Yakovlev

Kruchinin

Paasch-Colberg

et al. 2015

Ultrafast Dynamics Driven by Intense Light Pulses

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We review theoretical foundations and some recent progress related to the quest of controlling the motion of charge carriers with intense laser pulses and optical waveforms. The tools and techniques of attosecond science enable detailed investigations of a relatively unexplored regime of nondestructive strong-field effects. Such extremely nonlinear effects may be utilized to steer electron motion with precisely controlled optical fields and switch electric currents at a rate that is far beyond the capabilities of conventional electronics. IntroductionIt has long been realized that intense few-cycle laser pulses provide unique conditions for exploring extremely nonlinear phenomena in solids [1,2], the key idea being that a sample can withstand a stronger electric field if the duration of the interaction is shortened. Ultimately, a single-cycle laser pulse provides the best conditions for studying nonperturbative strong-field effects, especially those where the properties of a sample change within a fraction of a laser cycle. The recent rapid development of the tools and techniques of attosecond science [3] not only creates new opportunities for detailed investigations of ultrafast electron dynamics in solids, but it also opens exciting opportunities for controlling electron motion in solids with unprecedented speed and accuracy. Conventional nonlinear phenomena that accompany the interaction of intense laser pulses with solids have already found a vast number of applications in spectroscopy, imaging, laser technology, transmitting and processing information [4]. It can be expected that the less conventional nonpertur-

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Tunnel and multiphoton ionization of atoms and ions in a strong laser field (Keldysh theory)

Cited by 500 publications

References 123 publications

A classical treatment of optical tunneling in plasmonic gaps: extending the quantum corrected model to practical situations

A classical treatment of optical tunneling in plasmonic gaps: extending the quantum corrected model to practical situations

Analytical model for calibrating laser intensity in strong-field-ionization experiments

Ultrafast Control of Strong-Field Electron Dynamics in Solids

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