Exceptional point and parity-time symmetry on dipole mie resonances in dimer

Abstract

Here, we study exceptional point and parity-time (PT) symmetry regimes in a dimer of rods supporting dipole Mie resonances. In order to achieve PT-symmetry, the significant radiative decay that is associated with dipole resonances has to be offset by internal gain in the rods. We suggest an approach to finding the parameters of a dimer that would have an exceptional point at a given real frequency. We then show that this dimer starts demonstrating PT-symmetry when its gain-loss contrast is decreased with respect to the exceptional point.