Spectroscopy of condensed matter

Resonance of a thin film phonon with the surface polariton of the substrate

V. A. Yakovlev, N. N. Novikova, S. A. Klimin

Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow

Abstract: In layered structures, optical effects are, as a rule, linear across film thicknesses (at small thicknesses). Therefore, theoretically predicted by V.M. Agranovich, the root dependence of surface polariton (SP) splitting on thickness is unique. This work demonstrates the splitting of the sapphire SPP dispersion curve after deposition of a magnesium oxide film on its surface. The magnitude of this splitting is proportional to the square root of the transition layer thickness, as predicted by theory. A review of other experiments confirming the theoretical conclusions is carried out.

Keywords: surface phonon polaritons, atr spectroscopy, thin films, dispersion analysis, dispersion curves, magnesium oxide, sapphire.

Received: 07.06.2024
Revised: 07.06.2024
Accepted: 29.07.2024

DOI: 10.61011/OS.2024.08.59023.6792-24

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