Enhanced directional second harmonic radiation via nonlinear interference in 1D metamaterials

By using a one-dimensional nonlinear metamaterial in the experiment, we achieve a directional second harmonic radiation via nonlinear interference at approximately 2.5 GHz. Each meta-atom has the structure of coupled split-ring resonators and two varactors arranged parallel (symmetric) or antiparall...

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Bibliographic Details
Published inJournal of physics. D, Applied physics Vol. 51; no. 24; pp. 245105 - 245113
Main Authors Guo, B S, Loo, Y L, Zhao, Q, Ong, C K
Format Journal Article
LanguageEnglish
Published IOP Publishing 20.06.2018
Subjects
enhancement
interference
metamaterial
nonlinear
one-dimensional
resonance
SHG
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Summary:By using a one-dimensional nonlinear metamaterial in the experiment, we achieve a directional second harmonic radiation via nonlinear interference at approximately 2.5 GHz. Each meta-atom has the structure of coupled split-ring resonators and two varactors arranged parallel (symmetric) or antiparallel (antisymmetric) to each other. With an incident power of approximately  −2.7 dBm, the power of the emitted directional wave from the sample is at the scale of nanowatt. This relatively high magnitude of directional nonlinear power is the result of the 1D metamaterial abilities in exhibiting nonlinear magnetoelectric coupling, as well as supporting an electric dipole or magnetic dipole resonance within a narrow second harmonic frequency range.
Bibliography:JPhysD-115882.R1
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/aac3c8