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Using terahertz near field time-domain spectroscopy (THz-TDS), we image subwavelength, cylindrical waveguides (d = 150 mum) loaded with a dielectric material that has a resonance. Time- and frequency-domain near-field images of the individual electric field components are measured as the THz light emerges from the waveguides.
Broadband THZ near-field measurements were performed on different types of antennas and single elements of a metamaterial structure, all having sub-wavelength dimensions. The time and frequency dependence of the electric near-field are presented and compared with numerical calculations. Effects of the substrate are discussed.
We investigate surface wave generation by a single slit, both in nano-optical and in terahertz regimes. The wave-front in optical regime separates itself into forward propagating wave and surface-bound 90-degree diffracted wave; while, no such clear separation of modes is not observed in terahertz regime. Excitation wavelength dependency is systematically studied.
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