Waveguide terahertz time-domain spectroscopy is demonstrated to have the sensitivity to characterize nanometer-thick water layers on the surfaces of a parallel-plate metal waveguide. The measured far-infrared absorption and index of refraction of the 20-nm water layers are in reasonable self-consistent agreement with those of bulk water.
© 2004 Optical Society of America
Jiangquan Zhang and D. Grischkowsky, "Waveguide terahertz time-domain spectroscopy of nanometer water layers," Opt. Lett. 29, 1617-1619 (2004)