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Title: Topologically enhanced harmonic generation in a nonlinear transmission line metamaterial
Authors: Wang, Y.
Lang, L.-J.
Lee, C.H. 
Zhang, B.
Chong, Y.D.
Issue Date: 2019
Publisher: Nature Publishing Group
Citation: Wang, Y., Lang, L.-J., Lee, C.H., Zhang, B., Chong, Y.D. (2019). Topologically enhanced harmonic generation in a nonlinear transmission line metamaterial. Nature Communications 10 (1) : 1102. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
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. © 2019, The Author(s).
Source Title: Nature Communications
ISSN: 2041-1723
DOI: 10.1038/s41467-019-08966-9
Rights: Attribution 4.0 International
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