Optical Properties of Materials on Basis of Multi-Wall Carbon Nanotubes at Millimeter Wave Range

In this work, two measurement techniques for real and imaginary parts of the refractive index at millimeter wave range for application to nano-materials on basis of multi-wall carbon nanotubes (CNT) are modernized via measurement of: 1) coefficients of reflection and transmission; and 2) shift of the interference minimums. The first technique is modernized for measurement in thin (<0.5 mm) specimens with taking into account the multiple re-reflections inside thin specimen with small attenuation. The second technique which was developed earlier for specimens where the value of the real part of the refractive index is much more than the imaginary one is not applicable for CNT specimens where these values are of the same order of magnitude. Here, this technique is modernized for specimens with significant imaginary part of the refractive index.