Speed of sound measurement and mapping in transparent materials by impulsive stimulated Brillouin microscopy

IF 4.6 Q1 OPTICS Journal of Physics-Photonics Pub Date : 2024-05-12 DOI:10.1088/2515-7647/ad46a8
Taoran Le, Jiarui Li, Haoyun Wei and Yan Li
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Abstract

Impulsive stimulated Brillouin scattering (ISBS) is a variant of stimulated Brillouin scattering, which can overcome the shortcomings of the long acquisition time of traditional Brillouin microscopy. We introduce the difference between ISBS and other Brillouin microscopies in calculating longitudinal modulus. The Brillouin frequency shift obtained by ISBS is only related to the system parameters and the speed of sound (SOS) in the sample, not to the refractive index. Non-contact SOS measurement of homogeneous samples is an important application of Brillouin scattering, used in the early study of Brillouin spectroscopy and the mechanical properties of liquids. However, the measurement requires prior knowledge of the sample refractive index, which limits the measurement of the unknown refractive index sample. Here, we propose a method to measure the SOS based on ISBS, which in principle avoids the need for refractive index parameters. The SOS of several liquids are measured and compared with the standard values. The mean relative standard deviation is 1.13%. Moreover, we measure the SOS of a mixture of ethanol and water to demonstrate an application of measuring SOS without refractive index information. We also demonstrate the high spatial resolution of ISBS with a methanol-filled PDMS sample.
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利用脉冲刺激布里渊显微镜测量和绘制透明材料的声速图
脉冲刺激布里渊散射(ISBS)是刺激布里渊散射的一种变体,它可以克服传统布里渊显微镜采集时间长的缺点。我们介绍了 ISBS 与其他布里渊显微镜在计算纵向模量方面的区别。ISBS 获得的布里渊频移只与系统参数和样品中的声速(SOS)有关,而与折射率无关。对均匀样品进行非接触式 SOS 测量是布里渊散射的一项重要应用,早期用于研究布里渊光谱和液体的机械特性。然而,测量需要事先了解样品的折射率,这就限制了对未知折射率样品的测量。在此,我们提出了一种基于 ISBS 的 SOS 测量方法,原则上无需折射率参数。我们测量了几种液体的 SOS,并将其与标准值进行了比较。平均相对标准偏差为 1.13%。此外,我们还测量了乙醇和水的混合物的 SOS,展示了在没有折射率信息的情况下测量 SOS 的应用。我们还利用充满甲醇的 PDMS 样品展示了 ISBS 的高空间分辨率。
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来源期刊
CiteScore
10.70
自引率
0.00%
发文量
27
审稿时长
12 weeks
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