Time-domain Brillouin Scattering Theory for Probe Light and Acoustic Beams Propagating at an Angle and Acousto-optic Interaction at Material Interfaces

Overview

Journal Photoacoustics

Date 2023 Nov 13

PMID 37953941

Authors

Vitalyi E Gusev

Theo Threard

David H Hurley

Samuel Raetz

Affiliations

Soon will be listed here.

Abstract

A theory has been developed to interpret time-domain Brillouin scattering (TDBS) experiments involving coherent acoustic pulse (CAP) and light pulse beams propagating at an angle to each other. It predicts the influence of the directivity pattern of their acousto-optic interaction on TDBS signals when heterodyne detection of acoustically scattered light is in backward direction to incident light. The theory reveals relationships between the carrier frequency, amplitude and duration of acoustically induced "wave packets" in light transient reflectivity signals, and factors such as CAP duration, widths of light and sound beams, and their interaction angle. It describes the transient dynamics of these wave packets when the light and CAP encounter material interfaces, and how the light scattering by the incident CAP transforms into scattering by the reflected and transmitted CAPs. The theory suggests that single-point TDBS experiments can determine not only depth positions of buried interfaces but also their local inclinations/orientations.

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