Naslov
Nontrivial coupling of light into a defect: the interplay of nonlinearity and topology

Autori
Xia, Shiqi ; Jukić, Dario ; Wang, Nan ; Smirnova, Daria ; Smirnov, Lev ; Tang, Liqin ; Song, Daohong ; Szameit, Alexander ; Leykam, Daniel ; Xu, Jingjun ; Chen, Zhigang ; Buljan, Hrvoje

Izvornik
Light-Science & Applications (2047-7538) 9 (2020), 1; 147, 10

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
nonlinearity, topology

Sažetak
The flourishing of topological photonics in the last decade was achieved mainly due to developments in linear topological photonic structures. However, when nonlinearity is introduced, many intriguing questions arise. For example, are there universal fingerprints of the underlying topology when modes are coupled by nonlinearity, and what can happen to topological invariants during nonlinear propagation? To explore these questions, we experimentally demonstrate nonlinearity-induced coupling of light into topologically protected edge states using a photonic platform and develop a general theoretical framework for interpreting the mode-coupling dynamics in nonlinear topological systems. Performed on laser- written photonic Su-Schrieffer-Heeger lattices, our experiments show the nonlinear coupling of light into a nontrivial edge or interface defect channel that is otherwise not permissible due to topological protection. Our theory explains all the observations well. Furthermore, we introduce the concepts of inherited and emergent nonlinear topological phenomena as well as a protocol capable of revealing the interplay of nonlinearity and topology. These concepts are applicable to other nonlinear topological systems, both in higher dimensions and beyond our photonic platform.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA