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Title: Topologically enhanced harmonic generation in a nonlinear transmission line metamaterial
Authors: Wang, You
Lang, Li-Jun
Lee, Ching Hua
Zhang, Baile
Chong, Yidong
Keywords: Science::Physics
Issue Date: 2019
Source: Wang, Y., Lang, L., Lee, C. H., Zhang, B. & Chong, Y. (2019). Topologically enhanced harmonic generation in a nonlinear transmission line metamaterial. Nature Communications, 10, 1102-.
Project: MOE2015-T2-2-008
Journal: Nature Communications
Abstract: Nonlinear transmission lines (NLTLs) are nonlinear electronic circuits used for parametric amplification and pulse generation, and it is known that left-handed NLTLs support enhanced harmonic generation while suppressing shock wave formation. We show experimentally that in a left-handed NLTL analogue of the Su-Schrieffer-Heeger (SSH) lattice, harmonic generation is greatly increased by the presence of a topological edge state. Previous studies of nonlinear SSH circuits focused on solitonic behaviours at the fundamental harmonic. Here, we show that a topological edge mode at the first harmonic can produce strong propagating higher-harmonic signals, acting as a nonlocal cross-phase nonlinearity. We find maximum third-harmonic signal intensities five times that of a comparable conventional left-handed NLTL, and a 250-fold intensity contrast between topologically nontrivial and trivial configurations. This work advances the fundamental understanding of nonlinear topological states, and may have applications for compact electronic frequency generators.
ISSN: 2041-1723
DOI: 10.1038/s41467-019-08966-9
Rights: © 2019 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
Fulltext Permission: open
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