Time-domain Brillouin scattering theory for probe light and acoustic beams propagating at an angle and acousto-optic interaction at material interfaces

Gusev, Vitalyi E.; Thréard, Théo; Hurley, David H.; Raetz, Samuel

doi:10.1016/j.pacs.2023.100563

Cited by 3 publications

(1 citation statement)

References 46 publications

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“…In situations where one or more interfaces are inclined, complex scenarios may arise in which the wave vectors of phonons and probe photons are no longer aligned. A theory has been developed in the article [9] to describe these interactions, by taking into account these misalignments, the Gaussian form of the optical and acoustic beams, and their pulsed nature. An application is presented in the article [10] , in which beam deflection is produced by an inclined interface resulting from the non-uniform variation in the thickness of a sample subjected to an intense and non-hydrostatic pressure field.…”

Section: Regular Articlesmentioning

confidence: 99%

Special issue introduction: Ultrafast photoacoustics

Gusev,

Audoin,

Wright

2024

Photoacoustics

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Section: Regular Articlesmentioning

confidence: 99%

Special issue introduction: Ultrafast photoacoustics

Gusev,

Audoin,

Wright

2024

Photoacoustics

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Time-domain Brillouin scattering for evaluation of materials interface inclination: Application to photoacoustic imaging of crystal destruction upon non-hydrostatic compression

Sandeep,

Raetz,

Chigarev

et al. 2023

Photoacoustics

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Polariton-Induced Transparency in Multiple Quantum Wells Probed by Time Domain Brillouin Scattering

Karzel,

Samusev,

Linnik

et al. 2024

ACS Photonics

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The interference of the incident light reflected from the surface of a medium and from a picosecond strain pulse propagating through it results in temporal oscillations of the reflected intensity. This phenomenon, called time-domain Brillouin scattering, enables us to gain information about the optical field inside the medium. The oscillation amplitude decreases with increase of the distance from the strain pulse to the surface if the incident light is strongly absorbed, while it remains constant if the medium is transparent. Here we exploit time domain Brillouin scattering to probe the optical field inside a multiple quantum well layer for light strongly coupling to excitons and forming polaritons. At low excitation density, we observe conventional Brillouin oscillations whose amplitude is small when the strain pulse is positioned far from the surface due to the strong absorption of polaritons in the vicinity of the exciton resonance. At elevated optical density, the absorption disappears, the medium becomes transparent, and the amplitude of the oscillations does not depend on the distance of the strain pulse from the surface. We explain this effect of polariton-induced transparency by the increase of the incoherent exciton density generated as result of polariton scattering. Finally, the increase of the exciton density leads to transition of the exciton gas to a collective state, resulting in collapse of the polariton state and propagation of the incident light in the medium without absorption.

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Time-domain Brillouin scattering theory for probe light and acoustic beams propagating at an angle and acousto-optic interaction at material interfaces

Cited by 3 publications

References 46 publications

Special issue introduction: Ultrafast photoacoustics

Special issue introduction: Ultrafast photoacoustics

Time-domain Brillouin scattering for evaluation of materials interface inclination: Application to photoacoustic imaging of crystal destruction upon non-hydrostatic compression

Polariton-Induced Transparency in Multiple Quantum Wells Probed by Time Domain Brillouin Scattering

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