1 code implementation • 22 Jan 2021 • Rodrigo Gutiérrez-Cuevas, Emilio Pisanty
We construct optical beams in free space with robust skyrmionic structures in their polarization fields, both in the electric spin vector for near-circular fields and in the polarization direction for near-linear fields, and for both Bloch (spiral) and N\'eel (hedgehog) textures.
Optics
1 code implementation • 29 Feb 2020 • Emilio Pisanty, Marcelo F. Ciappina, Maciej Lewenstein
High-harmonic generation - the emission of high-frequency radiation by the ionization and subsequent recombination of an atomic electron driven by a strong laser field - is widely understood using a quasiclassical trajectory formalism, derived from a saddle-point approximation, where each saddle corresponds to a complex-valued trajectory whose recombination contributes to the harmonic emission.
Quantum Physics Atomic Physics Optics
2 code implementations • 15 Aug 2018 • Emilio Pisanty, Gerard Jiménez, Verónica Vicuña-Hernández, Antonio Picón, Alessio Celi, Juan P. Torres, Maciej Lewenstein
The fundamental polarization singularities of monochromatic light are normally associated with invariance under coordinated rotations: symmetry operations that rotate the spatial dependence of an electromagnetic field by an angle $\theta$ and its polarization by a multiple $\gamma\theta$ of that angle.
Optics
1 code implementation • 4 Jul 2018 • Alexis Chacón, Dasol Kim, Wei Zhu, Shane P. Kelly, Alexandre Dauphin, Emilio Pisanty, Andrew S. Maxwell, Antonio Picón, Marcelo F. Ciappina, Dong Eon Kim, Christopher Ticknor, Avadh Saxena, Maciej Lewenstein
Topological materials are of interest to both fundamental science and advanced technologies, because topological states are robust with respect to perturbations and dissipation.
Mesoscale and Nanoscale Physics Quantum Physics
1 code implementation • 1 Sep 2017 • Emilio Pisanty, Álvaro Jiménez-Galán
High-order harmonic generation with bicircular fields - the combination of counter-rotating circularly polarized pulses at different frequencies - results in a series of short-wavelength XUV harmonics with alternating circular polarizations, and experiments show that there is an asymmetry in the emission between the two helicities: a slight one in helium, and a larger one in neon and argon, where the emission is carried out by p-shell electrons.
Quantum Physics Atomic Physics Optics
1 code implementation • 6 Jun 2016 • Emilio Pisanty, Daniel D. Hickstein, Benjamin R. Galloway, Charles G. Durfee, Henry C. Kapteyn, Margaret M. Murnane, Misha Ivanov
However, all these effects, which rely on laser-driven recollision of an electron removed by the strong laser field and the parent ion, suffer from the rapidly increasing role of the magnetic field component of the driving pulse: the associated Lorentz force pushes the electrons off course in their excursion and suppresses all recollision-based processes, including high harmonic generation, elastic and inelastic scattering.
Atomic Physics
1 code implementation • 24 Apr 2014 • Emilio Pisanty, Misha Ivanov, Suren Sukiasyan
We present an alternative theoretical model for a recent experiment [A. Fleischer et al., Nature Photon.
Atomic Physics Quantum Physics
