Localized surface electromagnetic waves in CrI-based magnetophotonic structures
arXiv:1909.13841 · doi:10.1364/OE.394113
Abstract
Resulting from strong magnetic anisotropy two-dimensional ferromagnetism was recently shown to be stabilized in chromium triiodide, CrI, in the monolayer limit. While its properties remain largely unexplored, it provides a unique material-specific platform to unveil its electromagnetic properties associated with coupling of modes. Indeed, trigonal symmetry in the presence of out-of-plane magnetization results in a non-trivial structure of the conductivity tensor, including the off-diagonal terms. In this paper, we study the surface electromagnetic waves localized in a CrI-based structure using the results of {\it ab initio} calculations for the CrI conductivity tensor. In particular, we provide an estimate for the critical angle corresponding to the surface plasmon polariton generation in the Kretschmann-Raether configuration by a detailed investigation of reflectance spectrum as well as the magnetic field distribution for different CrI layer thicknesses. We also study the bilayer structure formed by two CrI layers separated by a SiO spacer and show that the surface plasmon resonance can be achieved at the interface between CrI and air depending on the spacer thickness.
arXiv comment11 pages, 6 figures
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