Sphere-on-film phonon coupling comes from mirror-charge mode mixing on dielectric films and Fuchs-Kliewer hybridization on metallic films, and needs multipolar modes beyond the dipole approximation.
Ruppin, Infrared active modes of dielectric crystallites on a substrate, Surface Science 58 (1976) 550 –556
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Substrate matters: Coupled phonon modes of a spherical particle on a substrate probed with EELS
Sphere-on-film phonon coupling comes from mirror-charge mode mixing on dielectric films and Fuchs-Kliewer hybridization on metallic films, and needs multipolar modes beyond the dipole approximation.