scholarly journals Bounds on strong field magneto-transport in three-dimensional composites

2011 ◽  
Vol 52 (10) ◽  
pp. 103705
Author(s):  
Marc Briane ◽  
Graeme W. Milton
Keyword(s):  
Strong Field ◽  
Three Dimensional

“Seeing” the Resonant SPP Modes Confined in Metal Nanocavity via Cathodoluminescne Spectroscopy

2014 ◽  
Vol 1659 ◽  
pp. 83-94
Author(s):  
Liu Chuanpu ◽  
Zhu Xinli ◽  
Zhang Jiasen ◽  
Xu Jun ◽  
Yu Dapeng
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Strong Field ◽  
Three Dimensional ◽  
Metal Nanostructures ◽  
Feature Size ◽  
Practical Applications ◽  
Plane Field ◽  
Out Of Plane ◽  
Plasmon Polaritons

ABSTRACT:Surface plasmon polaritons (SPPs), which are coupled excitations of electrons bound to a metal-dielectric interface, show great potential for application in future nanoscale photonic systems due to the strong field confinement at the nanoscale, intensive local field enhancement, and interplay between strongly localized and propagating SPPs. The fabrication of sufficiently smooth metal surface with nanoscale feature size is crucial for SPPs to have practical applications. A template stripping (ST) method combined with PMMA as a template was successfully developed to create extraordinarily smooth metal nanostructures with a desirable feature size and morphology for plasmonics and metamaterials. The advantages of this method, including the high resolution, precipitous top-to bottom profile with a high aspect ratio, and three-dimensional characteristics, make it very suitable for the fabrication of plasmonic structures. By using this ST method, boxing ring-shaped nanocavities have been fabricated and the confined modes of surface plasmon polaritons in these nanocavities have been investigated and imaged by using cathodoluminescence (CL) spectroscopy, which has been turned out to be a powerful means to characterize the resonant SPPs modes confined in metal nanocavities [1∼5] . The mode of the out-of-plane field components of surface plasmon polaritons dominates the experimental mode patterns, indicating that the electron beam locally excites the out-of-plane field component of surface plasmon polaritons. Quality factors can be directly acquired from the spectra induced by the ultrasmooth surface of the cavity and the high reflectivity of the silver (Ag) reflectors. Because of its three-dimensional confined characteristics and the omnidirectional reflectors, the nanocavity exhibits a small modal volume, small total volume, rich resonant modes, and flexibility in mode control. Numerous applications, such as plasmonic filter, nanolaser, and efficient light-emitting devices, can be expected to arise from these developments.

Numerical modeling of cathode-directed streamers branching in strong electric fields

2016 ◽  
Author(s):  
Белогловский ◽  
Andrey Beloglovskiy ◽  
Федорова ◽  
A. Fedorova
Keyword(s):  
Numerical Modeling ◽  
Numerical Model ◽  
Electric Fields ◽  
Strong Field ◽  
Strong Electric Field ◽  
Three Dimensional ◽  
Strong Electric Fields ◽  
Electron Avalanches ◽  
Discharge Gap ◽  
Positive Streamer

A research of conditions of the branching of positive streamer in air in a strong electric field by the use a three-dimensional numerical model is presented. This model is based on the assumption that the development of large electron avalanches in the strong field in front of the streamer head leads to branching. Tendency for branching has been observed, if the ratio of the diameters of the streamer heads to the distance between them is not greater than 0.55. If this ratio is more than 0,55, merger of originally formed streamer heads has been observed, and then only one streamer develops in the discharge gap.

NONLINEAR EFFECTS IN ELECTRON AND PHOTON EMISSION FROM ATOMS IN INTENSE LASER FIELDS

1992 ◽  
Vol 01 (02) ◽  
pp. 245-264 ◽  
Author(s):  
K.J. SCHAFER ◽  
J.L. KRAUSE ◽  
K.C. KULANDER
Keyword(s):  
Strong Field ◽  
Photon Emission ◽  
Three Dimensional ◽  
Nonlinear Effects ◽  
Intense Laser ◽  
Nonlinear Phenomena ◽  
Emission Rates ◽  
Intense Laser Fields ◽  
Laser Fields ◽  
High Order Harmonic

Atoms subject to intense laser fields are capable of absorbing many more photons than the minimum number needed to ionize. This leads to two striking nonlinear phenomena, above-threshold ionization, and high-order harmonic generation. We have used time-dependent methods to calculate both these processes nonperturbatively for realistic, three-dimensional atoms. This allows us to clarify the relationships between photon and electron emission rates in the strong field regime.

scholarly journals Strong-field physics in three-dimensional topological insulators

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
Denitsa Baykusheva ◽  
Alexis Chacón ◽  
Dasol Kim ◽  
Dong Eon Kim ◽  
David A. Reis ◽  
...  
Keyword(s):  
Topological Insulators ◽  
Strong Field ◽  
Three Dimensional ◽  
Strong Field Physics

scholarly journals Time-Dependent Unitary Transformation Method in the Strong-Field-Ionization Regime with the Kramers-Henneberger Picture

2021 ◽  
Vol 22 (16) ◽  
pp. 8514
Author(s):  
Je-Hoi Mun ◽  
Hirofumi Sakai ◽  
Dong-Eon Kim
Keyword(s):  
Unitary Transformation ◽  
Strong Field ◽  
Three Dimensional ◽  
Transformation Method ◽  
Time Dependent ◽  
Moving Frame ◽  
Evolution Operators ◽  
Step Size ◽  
One Dimensional ◽  
Strong Field Ionization

Time evolution operators of a strongly ionizing medium are calculated by a time-dependent unitary transformation (TDUT) method. The TDUT method has been employed in a quantum mechanical system composed of discrete states. This method is especially helpful for solving molecular rotational dynamics in quasi-adiabatic regimes because the strict unitary nature of the propagation operator allows us to set the temporal step size to large; a tight limitation on the temporal step size (δt<<1) can be circumvented by the strict unitary nature. On the other hand, in a strongly ionizing system where the Hamiltonian is not Hermitian, the same approach cannot be directly applied because it is demanding to define a set of field-dressed eigenstates. In this study, the TDUT method was applied to the ionizing regime using the Kramers-Henneberger frame, in which the strong-field-dressed discrete eigenstates are given by the field-free discrete eigenstates in a moving frame. Although the present work verifies the method for a one-dimensional atom as a prototype, the method can be applied to three-dimensional atoms, and molecules exposed to strong laser fields.

scholarly journals Adaptive strong-field control of chemical dynamics guided by three-dimensional momentum imaging

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
E. Wells ◽  
C.E. Rallis ◽  
M. Zohrabi ◽  
R. Siemering ◽  
Bethany Jochim ◽  
...  
Keyword(s):  
Strong Field ◽  
Three Dimensional ◽  
Chemical Dynamics ◽  
Field Control ◽  
Momentum Imaging

Angle-dependent strong-field ionization of triple bonded systems calculated by time-dependent configuration interaction with an absorbing potential

2016 ◽  
Vol 94 (12) ◽  
pp. 989-997 ◽  
Author(s):  
Qing Liao ◽  
Wen Li ◽  
H. Bernhard Schlegel
Keyword(s):  
Angular Dependence ◽  
Configuration Interaction ◽  
Strong Field ◽  
Population Analysis ◽  
Three Dimensional ◽  
Time Dependent ◽  
Molecular Axis ◽  
Field Ionization ◽  
Ionization Yield ◽  
Strong Field Ionization

The angle dependence of strong field ionization has been studied for a set of molecules containing triple bonds: HCCH, HCN, HCC–CN, H2N–CCH, H2N–CN, and H2N–CC–CN. Time-dependent configuration interaction (TDCI) with a complex absorbing potential was used to model strong field ionization by a linearly polarized seven-cycle 800 nm cosine squared pulse. The ionization yields have been calculated as a function of the laser intensity and polarization direction and plotted as three-dimensional surfaces. At low field strengths, the angular dependence can be understood in terms of ionization from the highest occupied orbitals. At higher laser intensities, ionization occurs from lower lying orbitals as well as from the highest occupied orbitals, as indicated by changes in the angular dependence of the ionization yield and by variations in the population analysis of the TDCI wavefunction with the intensity of the laser field. The ionization yield for directions parallel to the molecular axis increases more rapidly than perpendicular to the axis as the conjugation length is increased. NH2 substitution substantially increases the ionization yield along the molecular axis but has only a small effect for perpendicular directions.

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