Opt Lett. 2018 Jul 1;43(13):3037-3040. doi: 10.1364/OL.43.003037.
A volume grating-based holographic sensor in highly stretchable PVA/AA polymer for sensing its micro-deformation and, hence, the displacement has been studied. One-dimensional micro-displacement induced by tensile stress is analyzed using a diffraction spectrum in two kinds of sensor construction methods, i.e., transmission and reflection. The dependence of the peak wavelength on the displacement presents a good linear relationship which provides a quantitative sensing strategy for hydrogel micro-deformation. The available sensitivity is better than 4 μm/0.5 nm (displacement/wavelength shift) using a commercial spectrometer with a resolution of 0.5 nm. Finally, the reversible deformation response further validates the practical applicability of a holographic sensor constructed by photosensitive hydrogel. The optical measurement of micro-displacement as a novel sensing strategy can accelerate the development of the holographic optical element.
一种基于体积光栅的全息传感器，用于高拉伸性 PVA/AA 聚合物，用于感测其微变形，从而感测位移，已经过研究。使用两种传感器结构方法（透射和反射）的衍射光谱分析由拉伸应力引起的一维微位移。峰值波长对位移的依赖性呈现出良好的线性关系，为水凝胶微变形提供了定量传感策略。使用分辨率为 0.5nm 的商用分光计，灵敏度优于 4μm/0.5nm（位移/波长移动）。最后，通过光致聚合物水凝胶构建的全息传感器的可逆变形响应进一步验证了其实际适用性。微位移的光学测量作为一种新颖的传感策略，可以加速全息光学元件的发展。
