Daniel Younis
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Radiatively trapped pair plasma as a laser-to- photon converter Open
An energy equilibrium arises when an electron-positron pair plasma is generated by the nonlinear Breit-Wheeler interaction of a γ-ray bunch with laser photons and becomes radiatively confined. Ordinarily, ponderomotive scattering prevents …
Realization of Nontrivial Partial Spatial Coherence by Deformable Mirror Open
Partially coherent beam-shaping is a promising approach to mitigate turbulence-induced spreading. In this work, we employ singular-value decomposition to generate two types of partially-coherent phase screens, exhibiting either polynomial …
Spin-Polarization Control of Photoelectrons Using Poincaré Fields Open
Efficient helicity transfer from Poincaré fields to electrons of hydrogenic ions is revealed for the first time by four-dimensional relativistic simulations. The magnetic multipole class of Poincaré fields is chosen due to its fundamental …
View article: Quantum entanglement during single-cycle nonsequential ionization
Quantum entanglement during single-cycle nonsequential ionization Open
In order to elucidate the correlated motion of atomic electrons, we investigate the attosecond-scale dynamics of their entanglement arising due to nonsequential ionization driven by a strong, linearly-polarized laser field. The calculation…
View article: Multipartite Entanglement: A Journey through Geometry
Multipartite Entanglement: A Journey through Geometry Open
Genuine multipartite entanglement is crucial for quantum information and related technologies, but quantifying it has been a long-standing challenge. Most proposed measures do not meet the “genuine” requirement, making them unsuitable for …
View article: Evidence for unexpected robustness of multipartite entanglement against sudden death from spontaneous emission
Evidence for unexpected robustness of multipartite entanglement against sudden death from spontaneous emission Open
Entanglement is known to decay even in isolated systems, an effect attributed to spontaneous emission. This fragility of entanglement can be exacerbated by entanglement sudden death (ESD), where entanglement drops to zero abruptly within a…
Evolving Deformable Mirror Control to Generate Partially Coherent Light Fields Open
Evolutionary computation is a powerful optimization method that is well-suited for high-dimensional parameter spaces. In this work, we apply it to an integral task in optical physics, namely, to the problem of programming a deformable mirr…
View article: Strong-field nonsequential double photoionization using virtual-detector theory with path summation
Strong-field nonsequential double photoionization using virtual-detector theory with path summation Open
We present an ab initio study of the nonsequential strong-field ionization dynamics of a model two-electron atom with helium character. Single- and double-ionization events are characterized and displayed using detector signals extracted a…
View article: Multipartite Entanglement: A Journey Through Geometry
Multipartite Entanglement: A Journey Through Geometry Open
Genuine multipartite entanglement is crucial for quantum information and related technologies but quantifying it has been a long-standing challenge. Most proposed measures do not meet the ``genuine'' requirement, making them unsuitable for…
View article: Strong-Field Nonsequential Double Photoionization Using Virtual Detector Theory with Path Summation
Strong-Field Nonsequential Double Photoionization Using Virtual Detector Theory with Path Summation Open
We present an ab initio study of the nonsequential strong-field ionization dynamics of a model two-electron atom with helium character. Single- and double-ionization events are characterized and displayed using detector signals extracted a…
View article: Unexpected Robustness of Multipartite Entanglement against Sudden Death from Spontaneous Emission
Unexpected Robustness of Multipartite Entanglement against Sudden Death from Spontaneous Emission Open
Entanglement is known to decay even in isolated systems, an effect attributed to spontaneous emission. This fragility of entanglement can be exacerbated by entanglement sudden death (ESD), where entanglement drops to zero abruptly within a…
Polarized photoelectrons from converging vector waves Open
This paper investigates the spin characteristics of photoelectrons when hydrogen-like ions are centro-symmetrically irradiated with converging vector waves—a non-paraxial form of structured light. For a photon with given total angular mome…
Generation of collimated vortex gamma-rays from intense Poincaré beam–plasma interaction Open
We report on numerical calculations in which a multi-petawatt γ-ray beam is generated using a novel configuration based on fully structured light irradiating an overdense plasma waveguide. We analyze how the relativistic laser pulse effici…
View article: Benchmark of few-level quantum theory vs ab initio numerical solutions for the strong-field Autler–Townes effect in photoionization of hydrogen
Benchmark of few-level quantum theory vs ab initio numerical solutions for the strong-field Autler–Townes effect in photoionization of hydrogen Open
The temporal and spectral consequences of an intermediate resonance en route to photoionization are investigated theoretically in two ways: by solving few-level model equations and by ab initio numerical solution of the time-dependent Schr…
Diagnostic Techniques for Particle-in-Cell Simulations of Laser-produced Gamma-rays in the Strong-field QED Regime Open
The emission of multi-MeV ($γ$-ray) photons from the interaction of a high-powered laser pulse with a dense plasma target is studied using particle-in-cell simulations. A new set of diagnostic techniques is presented and applied to analyze…
Efficient terahertz and Brunel harmonic generation from air plasma via mid-infrared coherent control Open
Nonlinear light conversion involves one or more bound–bound, bound–free, free–free, and free–bound transitions. It is often challenging to interpret the exact conversion mechanisms. Here we use a femtosecond mid-infrared laser to enhance f…
Supplementary document for Efficient terahertz and Brunel harmonic generation from air plasma via mid-infrared coherent control - 4135890.pdf Open
supplementary material