Structural Evolution Design and Optimization for the Metamaterials with Broadband Frequency-Independent Negative Permeability
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Broadband frequency-independent operations are strongly desired in metamaterial applications. In this work, we unveil the roles of each element acting in the metamaterial unit with a structural evolution design methodology. Starting with “split ring resonator” (SRR) prototype structures, we focus on the variations of elements on the magnetic response and successfully realize the structures of “clock-like” and “wire pairs” with double and broadband frequency-independent negative permeability (0.725 to 0.9 THz, μ = − 0.75). Our results suggested that multi-resonance modes induced by elements integration could extend working bands. By well parameters tuning, the phase mismatch during multi-modes interactions could be utilized to modify the working bands with frequency-independent features as well. Our investigations are beneficial to the design of functional negative permeability metamaterials with broadband operations.
KeywordsMetamaterials Broadband Permeability Structural evolution
We thank Xiao Liu for the contribution to this work.
This study was supported by the joint fund of the National Natural Science Foundation Committee of China Academy of Engineering Physics (NSAF) (U1630108). This work was partially carried out at the USTC Center for Micro and Nanoscale Research and Fabrication.
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