Abstract-Optical Properties of Amorphous Perfluorinated Polymers in the Terahertz Range

M. S. Kitai, W. W. Volkov, A. A. Zharov, Ya. V. Zubavichus, P. V. Konarev, M. M. Nazarov, E. V. Polunin, Yu. E. Pogodina, V. I. Sokolov,
  https://link.springer.com/article/10.1007/s10812-018-0660-2

Novel amorphous perfluorinated polymers are synthesized and characterized using terahertz (THz) and x-ray spectra. The polymerization of such polymers in which all H atoms are replaced by F is examined. Their optical properties in the THz range show a record low index of refraction for solids in this range. The minimal possible index of refraction for such polymers is estimated. These materials are demonstrated to be highly transparent. The position of a weak absorption maximum in the range 1–2 THz is compared with the characteristic distance between the polymer structural elements that is obtained from an x-ray diffraction analysis of these materials.