Frequency tunable terahertz metamaterials using broadside coupled split-ring resonators

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2011-05-19
Ekmekci, E.
Strikwerda, A. C.
Fan, K.
Keiser, G.
Zhang, X.
Sayan, Gönül
Averitt, R. D.
We present frequency tunable metamaterial designs at terahertz (THz) frequencies using broadside coupled split-ring resonator (BC-SRR) arrays. Frequency tuning, arising from changes in near-field coupling, is obtained by in-plane displacement of the two SRR layers. For electrical excitation, the resonance frequency continuously redshifts as a function of displacement. The maximum frequency shift occurs for vertical displacement of half a unit cell, resulting in a shift of 663 GHz (51% of f(0)). 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.