Abstract
In this study, a new nanowaveguide is designed and modeled. Light confinement by the nanowaveguide generates a 1-terahertz (THz) wave with narrow bandwidth. A difference-frequency generation (DFG) technique based on the nonlinear property of a gallium arsenide crystal is used in the model for generation of the THz wave. All calculations are based on the method of finite difference time domain. The feasible conditions of phase matching are evaluated, and the structural parameters of the nanowaveguide are optimized. It was found that the simultaneous use of two parallel plasmonic surfaces in the structure improves THz output power of the nanowaveguide in comparison with that of other similar waveguides. The nanowaveguide output power is several times larger than the output power of the other waveguides based on DFG technique in all scales.
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