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Published on: September 22, 2017
Multi-wavelength excitation Brillouin spectroscopy
Maria A Troyanova-Wood1, Vladislav V Yakovlev2
1Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843 USA. She is now in Air Force Science and Technology Fellowship Program (formerly National Research Council Research Associateship Program) at Air Force Research Laboratory, JBSA Fort Sam Houston, Texas 78234 USA.
This study introduces a new multi-wavelength excitation Brillouin spectroscopy method to remove background noise. This technique accurately reconstructs pure Brillouin spectra, enabling precise measurements even in challenging samples.
Area of Science:
- Spectroscopy
- Materials Science
- Photonics
Background:
- Brillouin spectroscopy is sensitive to background distortions from various sources.
- These distortions, including absorption and light contamination, hinder accurate spectral analysis.
- Existing methods struggle with heavily distorted spectra, limiting applications.
Purpose of the Study:
- To develop and validate a novel method for correcting background distortions in Brillouin spectra.
- To enable accurate Brillouin shift and linewidth measurements in challenging samples.
- To computationally reconstruct pure Brillouin signals from multiple measurements.
Main Methods:
- Utilizing a multi-wavelength excitation Brillouin spectroscopy approach.
- Acquiring multiple Brillouin spectra with different excitation wavelengths.
- Computationally reconstructing the pure Brillouin component by removing baseline distortions.
Main Results:
- Successfully demonstrated the method on simulated and experimental spectra.
- Improved the goodness of fit for Brillouin peaks after baseline correction.
- Enabled analysis of highly-scattering samples previously unanalyzable due to distortions.
Conclusions:
- The multi-wavelength excitation method effectively corrects background distortions in Brillouin spectroscopy.
- This approach enhances the accuracy of Brillouin shift and linewidth measurements.
- The technique expands the applicability of Brillouin spectroscopy to complex and contaminated samples.
