Weakly nonlinear topological gap solitons in Su–Schrieffer–Heeger photonic lattices
Abstract
We study both theoretically and experimentally the effect of nonlinearity on topologically protected linear interface modes in a photonic Su–Schrieffer–Heeger (SSH) lattice. It is shown that under either focusing or defocusing nonlinearity, this linear topological mode of the SSH lattice turns into a family of topological gap solitons. These solitons are stable. However, they exhibit only a low amplitude and power and are thus weakly nonlinear, even when the bandgap of the SSH lattice is wide. As a consequence, if the initial beam has modest or high power, it will either delocalize, or evolve into a soliton not belonging to the family of topological gap solitons. These theoretical predictions are observed in our experiments with optically induced SSH-type photorefractive lattices.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 24, 2020
- Source ID
- 10.1364/ol.411102
Entities
People
- Daohong Song
- Jianke Yang
- Min Guo
- Nan Wang
- Shiqi Xia
- Zhigang Chen
Organizations
- Air Force Office of Scientific Research
- National Natural Science Foundation of China
- National Science Foundation