Shear Brillouin light scattering microscope.


Brillouin spectroscopy has been used to characterize shear acoustic phonons in materials. However, conventional instruments had slow acquisition times over 10 min per 1 mW of input optical power, and they required two objective lenses to form a 90° scattering geometry necessary for polarization coupling by shear phonons. Here, we demonstrate a confocal Brillouin microscope capable of detecting both shear and longitudinal phonons with improved speeds and with a single objective lens. Brillouin scattering spectra were measured from polycarbonate, fused quartz, and borosilicate in 1-10 s at an optical power level of 10 mW. The elastic constants, phonon mean free path and the ratio of the Pockels coefficients were determined at microscopic resolution.

DOI: 10.1364/OE.24.000319

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@article{Kim2016ShearBL, title={Shear Brillouin light scattering microscope.}, author={Moonseok Kim and Sebastien Besner and Antoine Ramier and Sheldon J. J. Kwok and Jeesoo An and Giuliano Scarcelli and S. H. Andy Yun}, journal={Optics express}, year={2016}, volume={24 1}, pages={319-28} }