An IR grating on a clean W(100) surface is shown to generate both homogeneous and inhomogeneous surface electromagnetic waves. An observed interference between these two components, which can be described in terms of a two-beam interferometer with variable arm amplitude and fixed optical path, is used to measure the plasma frequency accurately in the IR.
© 1986 Optical Society of America
L. M. Hanssen, D. M. Riffe, and A. J. Sievers, "Infrared surface-wave interferometry on W(100)," Opt. Lett. 11, 782-784 (1986)