Title
Particle-in-Cell Simulations of Ultrashort Optical Laser Pulses for Magnetic Field Enhancement and Electric Field Suppression
Author
Rodrigo Martín-Hernández
Grupo de Investigación en Aplicaciones del Láser y Fotónica, Departamento de Física Aplicada, Universidad de Salamanca, E-37008, Salamanca, Spain
Author
Elizaveta Gangsrkaia
Institute for Photonics, Faculty of Electrical Engineering and Information Technology, TU Wien, Austria
... show all
Abstract
Much of our knowledge about fundamental properties of atoms and molecules on the microscopic scale is the result of spectroscopy. The molecular response that is detected by optical spectroscopic techniques is dominated by the interaction between the electric field component of light and the molecular (transition) electric dipole (ED) moment because the analogous magnetic interaction is intrinsically orders of magnitude weaker. Nevertheless, magnetic dipole (MD) transitions are of strong interest, as they follow different spectroscopic selection rules compared to ED transitions and allow extracting complementary information on a molecule’s states. With the advent of modern laser sources for strong, ultrafast pulses, which allow for precise tailoring of the polarization, it is now possible to spatially separate electric and magnetic fields. This can be achieved utilizing azimuthally polarized beams (APBs), a subclass of so-called vector beams, which offer an enhanced magnetic field and exhibit a significantly suppressed electric field, i. e. a high B/E contrast, in the vicinity of the beam propagation axis [1]. Previously reported simulations [2] revealed that upon focusing few-femtosecond APB pulses on a small aperture, fast oscillating ring currents are induced inside the aperture material, which in turn enhance the magnetic field at the beam center.
Keywords
AperturesAzimuthally polarized beamsOpticsPhotonicsLaser spectroscopySpectroscopyField enhancementLaser sourcesPolarizationVector beamsVortex beamsParticle-In-Cell simulationFDTD simulationMaxwell Solver
Object type
Language
English [eng]
Persistent identifier
https://phaidra.univie.ac.at/o:2045516
Appeared in
Title
Conference on Lasers and Electro-Optics/Europe (CLEO/Europe 2023) and European Quantum Electronics Conference (EQEC 2023)
ISSN
2833-1052
Issued
2023
From page
eg_p_2
Publisher
IEEE
Date issued
2023
Access rights
Rights statement
© 2023 IEEE
University of Vienna | Universitätsring 1 | 1010 Vienna | T +43-1-4277-0