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Frequency Tunable Metamaterial Designs Using Near Field Coupled SRR Structures in the Terahertz Region

Ekmeki, Evren
Strikwerda, Andrew C.
Fan, Kebin
Keiser, George
Zhang, Xin
Sayan, Gönül
Averitt, Richard D.
We present frequency tunable metamaterials at terahertz frequencies using broadside-coupled split ring resonators (BC-SRRs). Frequency tuning, arising from changes in near field coupling, is obtained by in-plane displacement between the SRR layers. For electrical excitation, the resonance frequency continuously redshifts as a function of displacement. A maximum frequency shift occurs for displacement of half a unit cell resulting in a shift of 663 GHz (51% of f0). We discuss the difference in the BC-SRR response for electrical excitation in comparison to magnetic excitation in terms of hybridization arising from inductive and capacitive coupling.