Local-field corrections of the Green's tensor in chiral media

Abstract

In this paper we derive local-field corrections for interactions within chiral media using the Onsager real cavity model. The problem is not fully solvable analytically, so we introduce a matrix formalism to determine the correct local-field corrections. We find that left- and right-handed circularly polarized excitations yield different correction factors inside a chiral medium, analogous to their different propagation velocities. These chiral correction factors can significantly alter theoretical predictions for chiral effects within the medium. We validate our solution in various limits and special cases, particularly when the source and absorption points coincide, enabling analytical comparison for nonabsorbing media. For spontaneous emission in a chiral medium, we extend the local-field correction to absorbing media, revealing fundamentally different corrections analogous to the nonchiral case.