Topological edge solitons in \{chi}(2) waveguide arrays

Abstract

We address the formation of \{chi}(2) topological edge solitons emerging in topologically nontrivial phase in Su-Schrieffer-Heeger (SSH) waveguide arrays. We consider edge solitons, whose fundamental frequency (FF) component belongs to the topological gap, while phase mismatch determines whether second harmonic (SH) component falls into topological or trivial forbidden gaps of the spectrum for SH wave. Two representative types of edge solitons are found, one of which is thresholdless and bifurcates from topological edge state in FF component, while other exists above power threshold and emanates from topological edge state in SH wave. Both types of solitons can be stable. Their stability, localization degree, and internal structure strongly depend on phase mismatch between FF and SH waves. Our results open new prospects for control of topologically nontrivial states by parametric wave interactions.

arXiv comment4 pages, 5 figures

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Cited by in corpus (3)

• Topological edge states in equidistant arrays of Lithium Niobate nano-waveguides
• Quadratic solitons in higher-order topological insulators
• Topological gap solitons in equidistant lithium niobate waveguide arrays