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理解透明薄膜存在时的光声信号形成。

Understanding photoacoustic signal formation in the presence of transparent thin films.

作者信息

Illienko Maksym, Velsink Matthias C, Witte Stefan

机构信息

Advanced Research Center for Nanolithography (ARCNL), Science Park 106, Amsterdam, 1098 XG, The Netherlands.

Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, Amsterdam, 1081 HV, The Netherlands.

出版信息

Photoacoustics. 2024 May 13;38:100617. doi: 10.1016/j.pacs.2024.100617. eCollection 2024 Aug.

DOI:10.1016/j.pacs.2024.100617
PMID:39669098
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11637020/
Abstract

Strain-induced variation of the refractive index is the main mechanism of strain detection in photoacoustic experiments. However, weak strain-optic coupling in many materials limits the application of photoacoustics as an imaging tool. A straightforward deposition of a transparent thin film as a top layer has previously been shown to provide signal enhancement due to elastic boundary effects. In this paper, we study photoacoustic signal formation in metal covered by thin transparent films of different thicknesses and demonstrate that in addition to boundary effects, the photoacoustic response is affected by optical effects caused by the presence of the top layer. The interplay of optical effects leads to a complex temporal signal shape that strongly depends on the thickness of the thin film.

摘要

应变引起的折射率变化是光声实验中应变检测的主要机制。然而，许多材料中较弱的应变 - 光学耦合限制了光声作为成像工具的应用。先前已表明，直接沉积一层透明薄膜作为顶层，由于弹性边界效应可提供信号增强。在本文中，我们研究了不同厚度的透明薄膜覆盖的金属中的光声信号形成，并证明除了边界效应外，光声响应还受到顶层存在所引起的光学效应的影响。光学效应的相互作用导致了复杂的时间信号形状，该形状强烈依赖于薄膜的厚度。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/dfc281ddf1a8/gr10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/9d26e6758e5d/gr1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/ea8d18cb4f56/gr2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/9a63dc9ab8b0/gr3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/44e343713e9f/gr4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/59be3a872e08/gr5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/f9b7316326ff/gr6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/cf2babb9569c/gr7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/78ccce1f34a9/gr8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/476be5080f57/gr9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/dfc281ddf1a8/gr10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/9d26e6758e5d/gr1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/ea8d18cb4f56/gr2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/9a63dc9ab8b0/gr3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/44e343713e9f/gr4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/59be3a872e08/gr5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/f9b7316326ff/gr6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/cf2babb9569c/gr7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/78ccce1f34a9/gr8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/476be5080f57/gr9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/27d1/11637020/dfc281ddf1a8/gr10.jpg

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Rev Sci Instrum. 2023 Oct 1;94(10). doi: 10.1063/5.0155006.
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