Due to multiple scattering (MS), Brillouin spectroscopy is currently limited to analyzing transparent materials or the surface of opaque samples. To favor the applications toward in-depth 3D analysis, we provide a new analytic expression and an innovative experimental method to isolate the MS effect. The analytic model, derived from a fundamental description of the interaction process, compares well with a new experimental method, named polarization gated Brillouin spectroscopy, which selects the MS contribution through light polarization. Both experimental and analytic methods are tested against a benchmark material, milk, demonstrating their capability to extract reliable micromechanical parameters even for the in-depth investigation of highly turbid material.

中文翻译：

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布里渊显微镜中多重散射贡献的解缠结

由于多重散射 (MS)，布里渊光谱目前仅限于分析透明材料或不透明样品的表面。为了有利于深入 3D 分析的应用，我们提供了一种新的分析表达式和一种创新的实验方法来隔离 MS 效应。该分析模型源自对相互作用过程的基本描述，与一种名为偏振门控布里渊光谱的新实验方法进行了很好的比较，该方法通过光偏振选择 MS 贡献。实验和分析方法都针对基准材料牛奶进行了测试，证明了它们能够提取可靠的微机械参数，即使对于高混浊材料的深入研究也是如此。