标题： 生物样品质量密度的光学测量 显示英文标题

标题： Optical Measurement of Mass Density of Biological Samples

摘要： 质量密度是改进对生物样本内外的生物物理理解的重要性质。 它正日益引起积极的研究，但仍缺乏可靠的非接触技术来准确表征生物系统中的质量密度。 与普遍看法相反，仅凭折射率信息不足以确定样品的质量密度，正如我们在此通过理论和实验所展示的那样。 相反，我们测量了受激布里渊散射的非线性增益，以提供额外的信息用于质量密度估计。 这种全光方法将估计误差减少了十倍，为质量密度测量提供了一种更准确和通用的技术。 显示英文摘要

摘要： Mass density is a vital property for improved biophysical understanding of and within biological samples. It is increasingly attracting active investigation, but still lacks reliable, non-contact techniques to accurately characterize it in biological systems. Contrary to popular belief, refractive index information alone is insufficient to determine a sample's mass density, as we demonstrate here theoretically and experimentally. Instead, we measured the nonlinear gain of stimulated Brillouin scattering to provide additional information for mass density estimation. This all-optical method reduces the estimation error tenfold, offering a more accurate and universal technique for mass density measurements.