Abstract:
Dissipation loss of electromagnetic radiation with wavelengths of 20–55 $\mu$m was theoretically studied in a three-layer planar dielectric insulating waveguide combined with a heterolaser. It was shown that the dependence of the loss on the waveguide layer thickness behaves differently for different wavelengths in the range of 20–55 $\mu$m. The lowest loss (several inverse centimeters) is characteristic of radiation with wavelength $\lambda$ = 20 $\mu$m. The losses increase with the wavelength and reach a value of 150 cm$^{-1}$ at $\lambda$ = 40 $\mu$m, which is almost independent of the waveguide layer thickness. For electromagnetic radiation with $\lambda$ = 50 and 55 $\mu$m, a sharp (hundreds of times) decrease in the loss with an increase in the waveguide layer thickness is observed.
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