ArticlePhotoacoustics2023
Time-domain Brillouin scattering theory for probe light and acoustic beams propagating at an angle and acousto-optic interaction at material interfaces.
Article in Photoacoustics, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Special issue introduction: Ultrafast photoacoustics.Photoacoustics · 2024Article
- Time-domain Brillouin scattering for evaluation of materials interface inclination: Application to photoacoustic imaging of crystal destruction upon non-hydrostatic compression.Photoacoustics · 2023Article
- Time-domain Brillouin imaging of sound velocity and refractive index using automated angle scanning.Photoacoustics · 2023Article
- Sound velocity mapping from GHz Brillouin oscillations in transparent materials by optical incidence from the side of the sample.Photoacoustics · 2023Article
- Photoacoustic 3-D imaging of polycrystalline microstructure improved with transverse acoustic waves.Photoacoustics · 2021Article
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Authors and funding
4 authors.
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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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