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Metamaterialsare electromagnetic composites constructed by subwavelength sized microstructures, and thus can exhibit tailored effective permittivity and permeability. Effective-medium theory (EMT) plays a crucial role since it serves as a bridge to link theories, which are frequently conducted on model hypothetical systems, and experiments which are always performed on realistic metamaterial systems...
Holograms are the optical devices to reconstruct images by recovering amplitude and phase of light, which show many applications in our daily life. Recently, the metasurfaces, an array of sub-wavelength antenna, show the abilities to manipulate both the amplitude and phase of incident electromagnetic wave in a wide electromagnetic region from visible to microwave frequencies. Here, we realized a high-efficiency...
Based on light-scattering properties of graphene which possesses linear electronic band structure, we formulated a theoretical approach to study the optical properties of metamaterials made by patterning a graphene. The theory was applied to study various graphene-based MTMs, with predictions (with no adjustable parameters) for a particular system in excellent agreement with previous experiments.
We have designed and realized an optically non-existing transformation-medium, based on a specific plasmonic metamaterial. Such a medium can perfectly transport impinging waves at any incident angle under both TE and TM polarizations without phase accumulations. Effective medium theory, mode expansion theory and full-wave simulations are in consistency with each other and facilitated the design of...
We design an anisotropic ultrathin metamaterial to allow perfect transmissions of electromagnetic (EM) waves for two incident polarizations within a common frequency interval. The transparencies are governed by different mechanisms, resulting in significant differences in transmission phase changes for two polarizations. The system can thus manipulate EM wave polarizations efficiently in transmission...
: We employed both theoretical calculations and experiments to study the nonlinear responses in optical metamaterials. The spectra of second-harmonic generations measured on a fishnet metamaterial are in quantitative agreements with calculations based on full-wave numerical simulations combined with field integrations, both exhibiting ~80 times enhancements at the magnetic resonance frequency. Our...
Recently, artificially designed metamaterials have become of considerable interests, because they exhibit extraordinary optical characteristics that do not exist in nature and promise many potential applications, such as negative refraction, subwavelength imaging, and electromagnetic invisibility cloaking. Although creating metamaterials at the optical frequency range faces numerous technological...
Surface plasmon polaritons (SPPs) are elementary electromagnetic (EM) excitations bounded at a metal/dielectric interface. Due to two important features - local field enhancement and subwavelength resolution capability - of the SPP, it has attracted considerable attention recently and many SPP-based applications were proposed or demonstrated. However, for a natural material, its plasmon frequency...
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