Static fourier-spectrometer for solid surface studies in far infrared

The optical scheme and functioning of a static Fourier-transform (FT) spectrometer employing surface electromagnetic waves (SEW) at terahertz (THz) frequencies [A.A. Balashov et al., 2007] is discussed. The spectrometer enables one to obtain optical constants spectra of smooth metal surfaces as well as those of super thin (up to nm thick) films on their surfaces. Ordinary for IR spectroscopy a band, with 3000 cm^-1 width, including IR and THz ranges, could be obtained with femto-second laser pulse colored in 1600 cm^-1 for very fast processes spectroscopic studies of surface with fs time resolution (in principal).