Submillimeter-Wave Dielectric Measurements on Absorbing Materials

A summary is given of recent developments in dispersive Fourier transform techniques for the measurement of the frequency variation of the complex refractive index in the range 100 GHz-9 THz. Progress in overcoming the special problems associated with liquid and solid specimens of medium and strong absorption is reported and the current measurement capability is discussed with the aid of experimental results obtained using specially constructed equipment.