Measurement of dielectric properties of liquid ctystals in the millimeter and THz ranges

In [1] the dielectric properties of liquid crystals (LCs) of homological series n*CB (n = 5, 6, 7, 8) were measured in the millimeter-wave (MMW) range (frequencies 50-70 GHz) using. Here we describe the new method for measuring these properties and an experimental setup that implements this method at wavelengths of about 2 mm (frequencies from 130 to 180 GHz). These samples were investigated also at frequency of 0.6 THz with help Time Domain Spectroscopy method. The new method employs the Michelson interferometer (IM) designed on a quasi-optic square metal-dielectric waveguide of cross section 20 x 20 mm [2] (Figure 1).