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We present a scheme for achieving active composite right/left handed (CRLH) transmission line metamaterial waveguides in the THz by loading THz QC-laser metal-metal waveguides with sub-wavelength capacitive and inductive structures. We discuss our progress in using transmission-line metamaterial concepts for the engineering of THz active leaky-wave antennas that provide amplification and exhibit beam...
The cavity antenna model is applied to terahertz passive transmission-line metamaterials based upon metal-insulator-metal waveguides to predict their far-field radiation polarization. The model is verified experimentally by angle-resolved reflectivity spectroscopy of a planar composite right/left-handed metamaterial transmission-line array, which also allows for mapping of the waveguide dispersion.
The optical reflectivity of polished silicon covered by a forest of vertically standing gold nanowires (grown inside the pores of an anodic alumina matrix) is found to be considerably smaller than that of bare polished silicon and strongly influenced by scattering of light by the nanowires. We propose a phenomenological modification to the Maxwell–Garnett effective medium theory formula to account...
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