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A number of thin dielectric films deposited onto aluminated glass substrates and onto the materials transparent in the IR
range (silicon, KRS-5 and CsI) were investigated using infrared transmission and reflection-absorption techniques. The
application of these techniques to thin dielectric films at normal and oblique incidence of light allows the observation of
both the longitudinal and transverse optical phonons. The longitudinal (LO)-transverse (TO) optical phonons splitting is
analysed in terms of a dispersive local field effect. It has been shown that the results of LO-TO splitting obtained from
dispersive local field effect are in a good agreement with the results obtained from the dynamical theory of crystalline
lattices.
Igor I. Shaganov,Tatiana S. Perova, andAlan Moore
"Local field effect on infrared phonon frequencies of thin dielectric films", Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); https://doi.org/10.1117/12.464051
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Igor I. Shaganov, Tatiana S. Perova, Alan Moore, "Local field effect on infrared phonon frequencies of thin dielectric films," Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); https://doi.org/10.1117/12.464051