Lasing at the K-points of a honeycomb plasmonic lattice

TL;DR

This paper demonstrates lasing at the K-points of a honeycomb plasmonic lattice, utilizing symmetry-based mode analysis and experimental validation, paving the way for topological lasing studies.

Contribution

It introduces the first experimental demonstration of lasing at the K-points in a honeycomb plasmonic lattice based on symmetry and feedback mechanisms.

Findings

Lasing occurs at the K-points of the honeycomb lattice.

Polarization properties match T-matrix simulations.

Lasing mode identified as a singlet with energy minimum at K-point.

Abstract

We study lasing at the high-symmetry points of the Brillouin zone in a honeycomb plasmonic lattice. We use symmetry arguments to define singlet and doublet modes at the $\Kp$-points of the reciprocal space. We experimentally demonstrate lasing at the $\Kp$-points \changed{that is based on plasmonic lattice modes and two-dimensional feedback}. By comparing polarization properties to \changed{$T$-matrix} simulations, we identify the lasing mode as one of the singlets with an energy minimum at the $\Kp$-point enabling feedback. Our results offer prospects for studies of topological lasing in radiatively coupled systems.