Acousto-optical nanoscopy of buried photonic nanostructures

Czerniuk, Thomas; Schneider, C.; Kamp, Marlous; Höfling, Sven; Glavin, B. A.; Yakovlev, D. R.; Akimov, A. V.; Bayer, М.

doi:10.1364/optica.4.000588

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…Also from the technical point of view, samples for TDBS imaging could be prepared in such a way that most of the spurious signals degrading the TDBS signal, such as contributions to transient reflectivity caused by photo-excitation of the optoacoustic transducer, are suppressed. For example, it would be advantageous to have spatial separation between the regions where the CAP's are generated and the points where the inhomogeneities lie, as was done in some earlier picosecond ultrasonics experiments 117,118 .…”

Section: Nonlinear Transformation Of Coherent Nano-acoustic Pulsesmentioning

confidence: 99%

Advances in applications of time-domain Brillouin scattering for nanoscale imaging

Gusev

Ruello

2018

Applied Physics Reviews

105

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Time-domain Brillouin scattering is an all-optical experimental technique based on ultrafast lasers applied for generation and detection of coherent acoustic pulses on time durations of picoseconds and length scales of nanometers. In transparent materials scattering of the probe laser beam by the coherent phonons permits imaging of sample inhomogeneity. The transient optical reflectivity of the sample recorded by the probe beam as the acoustic nanopulse propagates in space contains information on the acoustical, optical, and acousto-optical parameters of the material under study. The experimental method is based on a heterodyning where weak light pulses scattered by the coherent acoustic phonons interfere at the photodetector with probe light pulses of significantly higher amplitude reflected from various interfaces of the sample. The time-domain Brillouin scattering imaging is based on Brillouin scattering and has the potential to provide all the information that researchers in material science, physics, chemistry, biology etc., get with classic frequency-domain Brillouin scattering of light. It can be viewed as a replacement for Brillouin scattering and Brillouin microscopy in all investigations where nanoscale spatial resolution is either required or advantageous. Here we review applications of time-domain Brillouin scattering for imaging of nanoporous films, ion-implanted semiconductors and dielectrics, texture in polycrystalline materials and inside vegetable and animal cells, and for monitoring the transformation of 2nanosound caused by nonlinearity and focusing. We also discuss the perspectives and the challenges for the future.I.

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Section: Nonlinear Transformation Of Coherent Nano-acoustic Pulsesmentioning

confidence: 99%

Advances in applications of time-domain Brillouin scattering for nanoscale imaging

Gusev

Ruello

2018

Applied Physics Reviews

105

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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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Acousto-optical nanoscopy of buried photonic nanostructures

Cited by 2 publications

References 31 publications

Advances in applications of time-domain Brillouin scattering for nanoscale imaging

Advances in applications of time-domain Brillouin scattering for nanoscale imaging

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

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