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Q: Fachverband Quantenoptik und Photonik

Q 7: Poster I

Q 7.16: Poster

Montag, 6. März 2023, 16:30–19:00, Empore Lichthof

Simulations of magnetic field amplification and electric field suppression in ultrashort optical laser pulses — •Lorenz Grünewald^1,2, Rodrigo Martín-Hernández³, Elizaveta Gangrskaia⁴, Valentina Shumakova⁴, Carlos Hernández-García³, and Sebastian Mai¹ — ¹Institute for Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währinger Str. 17, 1090 Vienna, Austria — ²Vienna Doctoral School in Chemistry (DoSChem), University of Vienna, Währinger Str. 42, 1090 Vienna, Austria — ³Grupo de Investigación en Aplicaciones del Láser y Fotónica (ALF-USAL), Dpt. Fisica Aplicada, Universidad de Salamanca, Pl. La Merced sn., E37008 Salamanca, Spain — ⁴Institute for Photonics, Faculty of Electrical Engineering and Information Technology, TU Wien, Gußhausstr. 27-29, 1040 Vienna, Austria

We present particle-in-cell simulations of the electromagnetic fields of an ultrashort azimuthally polarized laser beam (APB), and demonstrate that they exhibit a region close to the beam axis with strong oscillating magnetic field and vanishing electric field. Upon focusing the APB on a small metal iris, a so-called aperture, fast oscillating ring currents are induced around the aperture circumference, which in turn generates an additional magnetic field (MF) contribution that strongly increases the MF strength at the beam center [3]. Improved experimental setups with different aperture geometries, which yield further enhancements, are suggested, enabling a MF-only spectroscopy. [1] DOI: 10.1016/j.ccr.2015.02.015, [2] DOI: 10.1364/JOSAB.32.000345, [3] DOI: 10.1021/acsphotonics.8b01312