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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.
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