The mechanisms of absorption of terahertz and infrared radiation in PZT films

Terahertz and IR spectra of dielectric response of dense and porous Pb(Zr,Ti)O$_{3}$ films deposited on single-crystal magnesia and alumina substrates and on silicon substrates with a conducting platinum sublayer are measured in the and analyzed. We consider the key mechanisms of electric dipole absorption that give rise to absorption bands observed in experimentally measured reflection and transmission spectra, and discuss the relationship between the type of substrate and the parameters characterizing the absorption bands in the spectra of the prepared PZT films.