Abstract-A micromechanical tunable 3D metamaterial based on periodic rotatable double split resonant rings

Zeng Qu, Yong Zhang, Binzhen Zhang,

https://www.sciencedirect.com/science/article/pii/S0030402618309616

The electromagnetic response of the reported metamaterial is usually fixed, which greatly limits practical applications. Microstructural reconfiguration produces a drastic and dynamic controllability in metamaterials response that typically depend on shape, size, and distribution of metaatoms. Periodic rotatable double split resonant rings (DSRRs) structured on an ultrathin dielectric are adopted to design a micromechanical tunable 3 dimensional metamaterial (MT3DM). The powerful tunability quantified by transmissivity is conveniently achieved by mechanically changing location of gap in inner split ring. Modulation of transmissivity amplitude, resonance frequency, and band width reaches 54.41 dB, 0.31 THz, and 0.08 THz, respectively. The microstructure, equivalent circuit model, and reconfiguration mechanism of the proposed MT3DM are deeply discussed. The adjustable resonance can be easily scaled to the entire spectrum by geometrically regulating. Based on the powerful controllability, the proposed MT3DM can by widely applied in biochemical sensing, function materials, and electromagnetic devices including antenna, switch, absorber, and detector.