查看文章

Brillouin is a light-matter interaction that depends on several material properties, including the refractive index and the longitudinal modulus of the sample. We developed a technique that probes two different Brillouin scattering geometries in the same volume, allowing the retrieval of the index of refraction and the speed of the acoustic phonon in a direct manner. In biological samples, these two quantities are correlated respectively to the dry mass density and the longitudinal modulus. Coupling such measurement with a confocal microscope allows mapping of these properties for samples and in modalities unavailable with previous approaches.