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We describe experimental characterization of switchable terahertz metasurfaces using broadband ellipsometry. A theoretical framework based on generalized sheet transition conditions is developed to extract surface susceptibility as a function of frequency and applied DC bias. This will allow us to make a priori predictions of the performance of these switchable devices in device applications, enabling...
We recently demonstrated ultrathin, broadband, and highly efficient (reaching 88%) terahertz (THz) metamaterial structures exhibiting near-perfect anomalous (or generalized laws of) refraction. These structures redirect up to 61% of the incident power into the anomalous beam and practically eliminate the ordinary component. Here exploit this breakthrough to create more complex optical elements, specifically...
Resonant excitation of planar terahertz metamaterials using attenuated total reflection is demonstrated. Experimental results reveal an anomalous increase in the resonance strength while the sample is illuminated near the edge of the metamaterial array with a finite-size terahertz beam. A re-radiation signal at the fundamental metamaterial resonance is observed on the transmission side of the total...
We demonstrate broadening of fundamental resonance by successive insertion of rings inside of a split ring resonator (SRR) in a nested fashion. With the maximum inner rings, the resonance linewidth broadens by factor of four.
Bilayer split ring resonators as a function of separation (∼λ /500) and orientation are measured. Terahertz measurements match simulations showing frequency shifting of the resonances with implications for electrically small antenna design.
We demonstrate thermal tuning of the inductive capacitive (LC) resonance in terahertz metamaterials made up of gold split-ring resonator (SRR) arrays on ferroelectric bulk Strontium Titanate (STO) substrates. Heating the metamaterial from temperature of 150 K to 425 K causes as high as 69% blue shift in metamaterial resonance frequency due to the change in refractive index of the substrate.
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