Polarization state of radiation from a photonic crystal slab

TL;DR

This paper demonstrates that the polarization state of radiation from a photonic crystal slab is primarily determined by direct scattering, with an analytically predictable phase difference largely unaffected by the pattern, confirmed through simulations.

Contribution

It provides an analytical prediction of the polarization phase difference in photonic crystal slabs, validated by electromagnetic simulations.

Findings

The phase difference between polarized components can be predicted analytically.

The phase difference is largely independent of the pattern.

Simulations confirm the analytical predictions.

Abstract

We point out that the polarization state of radiation from a photonic crystal slab is strongly constrained by the direct non-resonant scattering process. The phase difference between the two linearly-polarized components in the far field can be predicted analytically and is largely independent of the periodic pattern. We verify the prediction with full-field electromagnetic simulations.