Dispersive coherent Brillouin scattering spectroscopy

Frequency- and time-domain Brillouin scattering spectroscopy are powerful tools to read out the mechanical properties of complex systems in material and life sciences. Indeed, coherent acoustic phonons in the time-domain method offer superior depth resolution and a stronger signal than incoherent ac...

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Bibliographic Details
Published in:arXiv.org 2022-05
Main Authors: Ishijima, Ayumu, Okabe, Shinga, Sakuma, Ichiro, Nakagawa, Keiichi
Format: Article
Language:English
Subjects:
Acoustic mapping
Acoustics
Coherent scattering
Complex systems
Dispersion
Frequency domain analysis
Heterodyning
Mechanical properties
Multichannel communication
Oscillations
Phonons
Spectroscopy
Spectrum analysis
Thin films
Time domain analysis
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Summary:Frequency- and time-domain Brillouin scattering spectroscopy are powerful tools to read out the mechanical properties of complex systems in material and life sciences. Indeed, coherent acoustic phonons in the time-domain method offer superior depth resolution and a stronger signal than incoherent acoustic phonons in the frequency-domain method. However, it does not allow multichannel detection and, therefore, falls short in signal acquisition speed. Here, we present Brillouin scattering spectroscopy that spans the time and frequency domains to allow the multichannel detection of Brillouin scattering light from coherent acoustic phonons. Our technique maps the time-evolve Brillouin oscillations at the instantaneous frequency of a chromatic-dispersed laser pulse. The spectroscopic heterodyning of Brillouin oscillations in the frequency domain enhances the signal acquisition speed by at least 100-fold over the time-domain method. As a proof of concept, we imaged heterogeneous thin films and biological cells over a wide bandwidth with nanometer depth resolution. We, therefore, foresee that our approach catalyzes future phonon spectroscopy toward real-time mechanical imaging.
ISSN:2331-8422
DOI:10.48550/arxiv.2109.01788