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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.
We apply terahertz microscopy for studying metamaterials with resonances in the terahertz band. The data provide insight into the metamaterial’s local response on scales much smaller than the unit cell of the structure.
We present terahertz metamaterials fabricated on large-area, free-standing thin (≤1 μm) silicon nitride membranes with the aim of reducing dielectric losses, enhancing metamaterial sensing capabilities, and enabling flexible and conformable designs.
We demonstrate a THz-metamaterial that exhibits a frequency selective resonant response based on the polarization of the incident field. The metamaterial is based on a asymmetric split-ring resonator structure. A polarization-insensitive design is also presented.
Planar electric metamaterials fabricated on thin, flexible substrates are studied using terahertz-time domain spectroscopy. Transmission measurements are performed to analyze dielectric properties on single and multiple stacked samples and reveal strong resonances at 1.2 THz.
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 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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