2018/05/10 by D. A. Dobrykh, A. V. Yulin, A. P. Slobozhanyuk +2 · 2 citations
Physics and Astronomy · #physics.optics #cond-mat.mes-hall #physics.class-ph
paper · pdf · doi:10.1103/physrevlett.121.163901
published as Phys. Rev. Lett. 121, 163901 (2018) · 5 pages, 5 figures
arxiv created 2018/05/10 · arxiv updated 2018/10/24
Topological photonics has recently emerged as a route to realize robust optical circuitry, and nonlinear effects are expected to enable tunability of topological states with the light intensity. Here we realize experimentally nonlinear self-induced spectral tuning of the electromagnetic topological edge states in an array of coupled nonlinear resonators in a pump-probe experiment. In a weakly nonlinear regime, we observe that resonators frequencies exhibit spectral shifts, that are concentrated mainly at the edge mode affecting only weakly the bulk modes. For a strong pumping, we describe several scenarios of the transformation of the edge states and their hybridization with bulk modes, and also predict a parametrically driven transition from topological to unstable regimes.