Goos-H\"anchen effect for Brillouin light scattering by acoustic phonons

TL;DR

This paper theoretically investigates the Goos-Hänchen effect in Brillouin light scattering, revealing how lateral shifts depend on acoustic wave polarization and scattering process type in total internal reflection.

Contribution

It introduces a theoretical analysis of the lateral shift in Brillouin scattering, highlighting the dependence on acoustic polarization and scattering process type.

Findings

Lateral shift varies with acoustic wave polarization.

Different scattering processes exhibit distinct lateral shift behaviors.

The study provides a theoretical framework for understanding beam shifts in Brillouin scattering.

Abstract

The lateral shift of an optical beam undergoing a Brillouin light scattering on acoustic wave in the total internal reflection geometry is studied theoretically. It is shown that the lateral shift depends on polarization (longitudinal or transversal) of the acoustic wave, as well as on the type of the scattering process: direct one, when the scattered wave undergoes a lateral shift at reflection from the interface, and cascading one, when fundamental-frequency light beam is laterally shifted at reflection and then is scattered on the acoustic wave.