Lasing in topological edge states of a one-dimensional lattice

Year: 2017

Authors: St-Jean P., Goblot V., Galopin E., Lemaitre A., Ozawa T., Le Gratiet L., Sagnes I., Bloch J., Amo A.

Autors Affiliation: Univ Paris Saclay, Univ Paris Sud, Ctr Nanosci & Nanotechnol, CNRS,Marcoussis C2N, F-91460 Marcoussis, France; Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy

Abstract: Topology describes properties that remain unaffected by smooth distortions. Its main hallmark is the emergence of edge states localized at the boundary between regions characterized by distinct topological invariants. Because their properties are inherited from the topology of the bulk, these edge states present a strong immunity to distortions of the underlying architecture. This feature offers new opportunities for robust trapping of light in nano-and micrometre-scale systems subject to fabrication imperfections and environmentally induced deformations. Here, we report lasing in such topological edge states of a one-dimensional lattice of polariton micropillars that implements an orbital version of the Su-Schrieffer-Heeger Hamiltonian. We further demonstrate that lasing in these states persists under local deformations of the lattice. These results open the way to the implementation of chiral lasers in systems with broken time-reversal symmetry and, when combined with polariton interactions, to the study of nonlinear phenomena in topological photonics.


Volume: 11 (10)      Pages from: 651  to: 656

DOI: 10.1038/s41566-017-0006-2

Citations: 615
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