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We present the effect of metal permittivity on transmission properties of double split-ring terahertz metamaterials. The measured LC resonance is enhanced with increasing imaginary permittivity of the constituent metals, showing consistence with numerical simulations.
Optically thin terahertz metamaterials made from Pb split-ring resonators are investigated. The LC resonance emerges at a critical metal thickness near 0.15 skin depth and exhibits a characteristic evolution with increasing thicknesses at sub-skin-depth level.
We investigate the limitations of using THz metamaterials as thin-film chem-bio sensors, by depositing dielectric overlayers onto split-ring resonator arrays. We also study resonance shifts by conjugating biomolecules using avidin/silane linkers attached to the resonators.
A lumped-element circuit model is shown to accurately describe the behavior of terahertz metafilms, or planar metamaterials. The model provides insight into the proper application of effective medium approximations in determining metafilm constitutive parameters.
We present a hybrid metamaterial semiconductor device capable of 20% tunability of the center resonance frequency via photoexcitation of the semiconductor regions, thereby addressing the metamaterials drawback of narrow bandwidth operation.
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