We demonstrate time‐resolved terahertz spectroscopy inside a novel parallel plate waveguide where one of the metallic plates is replaced by a transparent conducting oxide. Considerable improvements to the waveguide loss coefficient are shown, with a power absorption coefficient of 4 cm –1 at 0.5 THz. The time resolution of the technique is shown to be limited by the spatial excitation profile, which for sharply focused beams can approach ∼1 ps time scales. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Cooke et al. (2009) studied this question.
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