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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. https://doi.org/10.1038/s41467-019-08966-9 | 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 | URI: | https://scholarbank.nus.edu.sg/handle/10635/209901 | ISSN: | 2041-1723 | DOI: | 10.1038/s41467-019-08966-9 | Rights: | Attribution 4.0 International |
Appears in Collections: | Elements Staff Publications |
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