Loss-driven topological transitions in lasing
Optics
2022-10-21 v2 Mesoscale and Nanoscale Physics
Quantum Gases
Abstract
We experimentally observe lasing in a hexamer plasmonic lattice and find that when tuning the scale of the unit cell, the polarization winding of the emission changes. By a theoretical analysis we identify the lasing modes as quasi bound states in continuum (quasi-BICs) of topological charges of zero, one or two. A T-matrix simulation of the structure reveals that the mode quality(Q)-factors depend on the scale of the unit cell, with highest-Q modes favored by lasing. The system thus shows a loss-driven transition between lasing in modes of trivial and high-order topological charge.
Cite
@article{arxiv.2206.08897,
title = {Loss-driven topological transitions in lasing},
author = {Grazia Salerno and Rebecca Heilmann and Kristian Arjas and Kerttu Aronen and Jani-Petri Martikainen and Päivi Törmä},
journal= {arXiv preprint arXiv:2206.08897},
year = {2022}
}