- Letter
Entropic measure of directional emissions in microcavity lasers
Phys. Rev. A 106, L031504 – Published 15 September, 2022
DOI: https://doi.org/10.1103/PhysRevA.106.L031504
Abstract
We propose a notion of the directional emission in microcavity lasers. First, the Shannon entropy of the far-field profiles in the polar coordinate can quantify the degree of unidirectionality of the emission, while previous notions about the unidirectionality cannot efficiently measure in the robust range against a variation of the deformation parameter. Second, a divergence angle of the directional emission is defined phenomenologically in terms of full width at half maximum, and it is only easily applicable to a simple peak structure. However, the Shannon entropy of semimarginal probability of the far-field profiles in the Cartesian coordinate can present equivalent results, and moreover it is applicable even to cases with a complicated peak structure of the emission.
