A liquid drop resting on a soft solid deforms the surface at the three-phase contact line. The surface deformation, also called “wetting ridge”, varies in size from nanoscales to microscales, depending on the elasticity and thickness of the soft layer. In this work, we probe how surface elasticity and coating thickness influences normal and tangential surface deformation profiles induced by a sessile liquid drop using dual-wavelength reflection interference contrast microscopy. Furthermore, we experimentally verify the appropriate characteristic length scale, which closely describes the ridge profiles on both thick and thin soft layers for two different surface elasticities.

中文翻译：

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使用双波长反射干涉对比显微镜探测软固体上液滴引起的变形

停留在软固体上的液滴会使三相接触线处的表面变形。表面变形，也称为“润湿脊”，大小从纳米级到微米级不等，具体取决于软层的弹性和厚度。在这项工作中，我们使用双波长反射干涉对比显微镜探讨了表面弹性和涂层厚度如何影响由固定液滴引起的法向和切向表面变形剖面。此外，我们通过实验验证了适当的特征长度尺度，该尺度密切描述了两种不同表面弹性的厚软层和薄软层上的脊轮廓。