Polarization diversity close to the optical bound states in the continuum

TL;DR

This paper demonstrates that polarization states near bound states in the continuum (BICs) in photonic graphene exhibit significant diversity and topological features, enabling advanced control of light polarization for on-chip photonics.

Contribution

It introduces a theoretical framework linking the polarization trajectories around BICs to their topological charges, revealing new polarization phenomena in photonic crystal slabs.

Findings

Observation of C-points near BICs at K point.

Polarization trajectories form closed loops on the Poincare sphere.

Topological charge relates to the winding number of polarization loops.

Abstract

Bound states in the continuum (BICs) realized in two-dimensional (2D) photonic crystal slabs (PhCSs) have attracted considerable attentions, owing to the advantages in the fabrications and on-chip applications. The polarization vortex centered at BICs in the momentum space displayed by the linear polarization vectors of far-field radiation is a striking property of BICs. Here, by constructing BICs at K point in photonic graphenes, we theoretically demonstrate that the far-field polarization states close to BICs can exhibit remarkable polarization diversity. Interestingly, C-points (circular polarizations) close to BIC at K point are observed. Thus, we propose that, along a closed loop enclosing BICs in the momentum space, the trajectory of the far-field polarization states on the shell of the Poincare sphere could provide a general and straightforward means to characterize the topological natures of BICs. The topological charge carried by the BIC can be defined by the half of the winding number of the trajectory around the S3 axis, which is an integer and half integer for the non-degenerate and double-degenerate BICs at K point, respectively. Our findings could open a gateway towards the applications of BICs in lasers with full polarizations and the generation and manipulation of vector beams of light.