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We study the role of complex scattering effects in transferred bi-layer and tri-layer CVD graphene, wherein the dynamics of intrinsic and photo-excited carriers is governed by interactions between adjacent layers. We observed non-Drude conductivity stemming from scattering in electrically connected systems; these effects being more pronounced at low temperatures. Dynamics of photo-excited carriers...
THz technology offers multiple applications in areas such as remote sensing, spectroscopy, biomedical imaging, and ultra-wide bandwidth communications [1]. However, obtaining high-frequency performance at THz frequencies has proven challenging in conventional electronic devices. This difficulty motivated the exploration of unconventional transport mechanisms such as electron plasma waves. Two dimensional...
This work discusses and compares two proposed practical approaches for realizing graphene-based reconfigurable terahertz metamaterials, namely: graphene-only plasmonic structures, and graphene/metal hybrid structures. From rigorous theoretical analysis, full-wave electromagnetic numerical simulations, as well as supporting experiments, several reconfigurable structures are analyzed and compared in...
In this work we describe the effect of the electron momentum relaxation time on the terahertz properties of periodically-patterned graphene plasmonic structures; more specifically, its effect on the quality of the characteristic plasmonic resonances. From analytical theory as well as numerical simulations, it is observed that the electron momentum relaxation time heavily affects the quality factor...
We propose two methods of nullsteering for a compact analog uniform circular array system. One method is based on switched beam. The predefined null patterns were generated by nullsteering algorithms and saved in the array system. The second method is based on adaptive array. A single channel receiver and A/D converter were added to the analog array output for adaptive array processing. Therefore,...
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