Nanoscale Control over Magnetic Light-Matter Interactions
arxiv(2024)
摘要
Light-matter interactions are frequently perceived as predominantly
influenced by the electric optical field, with the magnetic component of light
often overlooked. Nonetheless, the magnetic aspect plays a pivotal role in
various optical processes, including chiral light-matter interactions,
photon-avalanching, and forbidden photochemistry, underscoring the significance
of manipulating magnetic processes in optical phenomena. Here, we explore the
ability to control the magnetic light and matter interactions at the nanoscale.
In particular, we demonstrate experimentally, using a plasmonic nanostructure,
the transfer of energy from the optical magnetic field to a nanoparticle,
thanks to the deep subwavelength magnetic confinement allowed by our
nano-antenna. This control is made possible by the particular design of our
plasmonic nanostructure, which has been optimized to spatially separate the
electric and magnetic fields of the localized plasmon. Furthermore, by studying
the spontaneous emission from the Lanthanide-ions doped nanoparticle, we
observe that the optical field distributions are not spatially correlated with
the electric and magnetic near-field quantum environments of this antenna,
which seemingly contradicts the reciprocity theorem. We demonstrate that this
counter-intuitive observation is in fact, the result of the different optical
paths followed by the excitation and emission of the ions, which forbids a
direct application of that theorem.
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