Using Inductance as a Tuning Parameter for RF Meta-atoms

Abstract

Abstract:The resonant frequency of metamaterials structured with split ring resonator (SRR) meta-atoms is determined primarily through the capacitance and inductance of the individual meta-atoms. Two designs that vary inductance incrementally were modeled, simulated, fabricated, and tested to investigate the role inductance plays in metamaterial designs. The designs consisted of strategically adding sections to the SRR to increase the inductance, but in a manner that minimized capacitance variations. Each design showed a shift in resonant frequency that was proportional to the length of the added section. As the length of each section was increased, the resonant frequency shifted from 2.78 GHz to 2.18 GHz.

Inductive Tuning of Fano-Resonant Metasurfaces Using Plasmonic Response of Graphene in the Mid-Infrared

“…Indeed, adding fluid or even a protein monolayer to a metamaterial causes measurable red-shifting that can be used for sensing. Achieving a blue shift would require reducing the inductance and is more challenging , because the capacitance increase due to field expulsion usually dominates. − This difficulty in blue-shifting metamaterial resonances has been recognized for some time, and several approaches to decreasing L by optically induced switching to a different resonant mode of a metamaterial ,, have been recently demonstrated. Because these approaches rely on producing high densities of optically generated free carriers in semiconductors, they have been primarily restricted to the terahertz frequency range.…”