We present measurements of the Brillouin cross-section for a metallic thin film (aluminium and gold) on a silicon substrate, obtained by using a tandem multipass interferometer. The results for the aluminium coating are explained in terms of scattering from the surface corrugation due to the thermally excited acoustic phonons. In the case of gold we find an appeciable contribution from the elastooptic coupling in the film. In both cases the interface modes are experimentally resolved and theoretically explained.
Brillouin Scattering from Interface Acoustic Phonons / J. R., Sandercock; F., Nizzoli; Bortolani, Virginio; Santoro, Giorgio; A., Marvin. - In: LE VIDE, LES COUCHES MINCES. - ISSN 0223-4335. - STAMPA. - 201:(1980), pp. 754-757.
Brillouin Scattering from Interface Acoustic Phonons
BORTOLANI, Virginio;SANTORO, Giorgio;
1980
Abstract
We present measurements of the Brillouin cross-section for a metallic thin film (aluminium and gold) on a silicon substrate, obtained by using a tandem multipass interferometer. The results for the aluminium coating are explained in terms of scattering from the surface corrugation due to the thermally excited acoustic phonons. In the case of gold we find an appeciable contribution from the elastooptic coupling in the film. In both cases the interface modes are experimentally resolved and theoretically explained.
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