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A composite right/left-handed metamaterial waveguide for terahertz quantum-cascade lasers is presented. Left handed (backward wave) propagation is confirmed by using the waveguide as a leaky-wave antenna where directional beams at angles of −4° and −63° are experimentally observed at excitation frequencies 2.59 and 2.48 THz, respectively.
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.
We present the use of the cavity antenna model in predicting the radiative loss, far-field polarization and far-field beam patterns of terahertz quantum-cascade (QC) lasers. Metal–metal waveguide QC-lasers, transmission-line metamaterial QC-lasers, and leaky-wave metamaterial antennas are considered. Comparison of the fundamental and first higher order lateral mode in a metal-metal waveguide QC-laser...
A one-dimensional metamaterial waveguide for terahertz quantum-cascade lasers is presented that tailors laser radiation to a low-divergence beam with frequency-dependent direction. The demonstrated prototype exhibits narrow (FWHM ∼ 15°) surface emission (40° from broadside) at 2.74 THz.
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