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Dispersion control and active materials integration have yielded plasmonic components including i) three-dimensional single layer plasmonic metamaterials ii) all-optical, electro-optic and field effect modulation of plasmon propagation iii) plasmon-enhanced absorption in solar cells.
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.
THz radiation transmission through a dual-band electric metamaterial is presented, where we analyze manufacturing defects in the metamaterial. Removing different resonator percentages allows us to quantify the effects of manufacturing defects on the material response.
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.
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.
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.
We demonstrate group velocity enhancement in a composite metamaterial consisting of ensembles of dielectric and metallic particles. This finding introduces another class of metamaterials that lack spatial order but nonetheless possess peculiar electromagnetic properties.
Artificial magnetism, negative permeability and zero refractive index are demonstrated in 3D-chiral metamaterial that shows giant polarization rotation and circular dichroism.
We present metamaterials that can possess arbitrarily high refractive indices over very broad frequency range. Nearly independent control of permittivity and permeability can be achieved by geometrical designs, without using dispersive, resonant elements.
We present a bulk metamaterial operating in the THz frequency range. The implemented structure consists of pairs of metallic crosses for which the resulting composite medium exhibits a lefthanded transmission band at about 1.1 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 demonstrate a THz-metamaterial that exhibits a frequency selective resonant response based on the polarization of the incident field. The metamaterial is based on an asymmetric split-ring resonator structure. A polarization-insensitive design is also presented.
We apply terahertz microscopy for studying metamaterials with resonances in the terahertz band. The data provide insight into the metamaterialpsilas local response on scales much smaller than the unit cell of the structure.
We study 1D stacks comprising alternating layers of normal and metamaterials, with disorder in both refractive index and layer thickness, and show strong suppression of localisation with only index disorder.
We report that small chiral asymmetry of the unit cell of planar metamaterials leads to strong resonant asymmetric transmission for circularly polarized light due to excitation of enantiomerically sensitive trapped modes.
We probe the nonlinear optical properties of a fishnet metamaterial via second harmonic generation (SHG) and third harmonic generation (THG) spectroscopy. We show that the resonance enhancement of nonlinear response in metamaterials is distinct from molecular case.
Two novel designs for optical cloaking based on nonlinear transformations for TM and TE polarizations are presented. This critical development builds upon our previous work on nonmagnetic cloak designs and high-order transformations.
We use the coordinate transformation technique to design metamaterial lenses that can magnify a two-dimensional planar image beyond the diffraction limit.
We prepare diffractive arrays of metal nanoparticles that possess molecular and structural chirality. Both cases lead to comparative chiral polarization effects, which must be interpreted as arising from chirality of the experimental setup.
We experimentally demonstrate the implementation of three-dimensional optical metamaterials. We investigate the interaction between adjacent stacked layers using the method of plasmon hybridization and analyze the optical properties of stacked metamaterials with increasing layer numbers.
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