Speaker
Description
Hyperbolic polaritons are light–matter quasiparticles that exhibit highly confined, directional propagation, making them promising candidates for applications in nanophotonic devices. In particular, their reduced wavelengths enable light to be confined and guided on length scales far below the free-space diffraction limit. Chromium sulfide bromide (CrSBr) is one material that supports these excitations. In this work, we develop an electrodynamic framework to describe polariton propagation in CrSBr. Starting from Maxwell’s equations and the electromagnetic boundary conditions, we derive a transfer matrix for a CrSBr slab. We use this formalism to calculate the polariton dispersion, examine isofrequency contours, and identify the slab’s eigenmodes. These eigenmodes provide the basis for constructing a Green’s function that describes the spatial response to a localized excitation. Our preliminary results capture detailed features of polariton propagation and provide a basis for comparison with recent experimental observations.
