METHOD FOR DETERMINING THE DIELECTRIC PERMITTIVITY OF METALS IN THE TERAHERTZ RANGE Russian patent published in 2022 - IPC G02B6/00 

FIELD: condensed matter optics.

SUBSTANCE: invention relates to condensed matter optics and can be used to determine the dielectric constant of metal and metallized reflective surfaces in the terahertz range of the spectrum (frequency from 0.1 THz to 10 THz), capable of directing surface plasmon polaritons (SPP) - a type of surface electromagnetic waves, as well as for optical spectroscopy and quality control of such surfaces. The effect is achieved as a result of a radical decrease in the radiation component of SPP losses by depositing a homogeneous layer of a non-absorbing dielectric on the studied flat face of the sample, which ensures a significant predominance of the SPP Joule losses over their radiation losses. In this case, the SPP propagation length is determined mainly by the Joule losses taken into account by the SPP dispersion equation; the radiation losses of the SPP, this equation used to calculate the dielectric constant ε_м of the metal, does not take into account.

EFFECT: increasing the reliability of the value of the dielectric constant of the metal obtained by the proposed method.

1 cl, 1 dwg, 1 tbl