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Structured light provides unique opportunities to spatially tailor theelectromagnetic field of laser beams. This includes the possibility of asub-wavelength spatial separation of their electric and magnetic fields, whichwould allow isolating interactions of matter with pure magnetic (or electric)fields. This could be particularly interesting in molecular spectroscopy, asexcitations due to electric and -- usually very weak -- magnetic transitiondipole moments can be disentangled. In this work, we show that the use oftailored metallic nanoantennas drastically enhances the strength of thelongitudinal magnetic field carried by an ultrafast azimuthally polarized beam(by a factor of $\sim65$), which is spatially separated from the electric fieldby the beam's symmetry. Such enhancement is due to favorable phase-matching ofthe magnetic field induced by the electronic current loops created in theantennas. Our particle-in-cell simulation results demonstrate that theinteraction of moderately intense ($\sim10^{11}$ W/cm$^2$) and ultrafastazimuthally polarized laser beams with conical, parabolic, Gaussian, orlogarithmic metallic nanoantennas provide spatially isolated magnetic fieldpulses of several tens of Tesla.

Optical Magnetic Field Enhancement using Ultrafast Azimuthally Polarized Laser Beams and Tailored Metallic Nanoantennas