Liu Hongpeng, Yu Dan, Zhou Ke, Wang Shichan, Luo Suhua, Wang Weibo, Song Qinggong
Appl Opt. 2017 Nov 10;56(32):9006-9013. doi: 10.1364/AO.56.009006.
A novel thermo-sensitive N-isopropylacrylamide photopolymer was developed for improving the temperature and humidity responses of holographic sensors. Diffraction spectra of holographic volume gratings recorded in the materials were characterized to explore the sensing response capacity. A dependence of peak wavelength on the temperature was observed and provided a quantitative strategy for holographic sensing applications. Expansion of the humidity range induced a strong extension of wavelength shift. Finally, the temperature response reversibility was demonstrated experimentally. Our sensing results were completely different from the reported typical acrylamide polymer system. Compared with the former, we obtained a more sensitive temperature response and an evident shift expansion (>200 nm) at a relative humidity of 70% or higher. These results can obviously improve the thermo-sensitivity of a holographic sensor and expand the practical application area of the holographic sensing strategy.
为了改善全息传感器的温度和湿度响应，研发了一种新型的热敏性N-异丙基丙烯酰胺光聚合物。对记录在该材料中的全息体光栅的衍射光谱进行了表征，以探索其传感响应能力。观察到峰值波长对温度的依赖性，并为全息传感应用提供了一种定量策略。湿度范围的扩大导致波长偏移的强烈扩展。最后，通过实验证明了温度响应的可逆性。我们的传感结果与报道的典型丙烯酰胺聚合物系统完全不同。与前者相比，我们在70%或更高的相对湿度下获得了更灵敏的温度响应和明显的偏移扩展（>200 nm）。这些结果可以显著提高全息传感器的热敏性，并扩大全息传感策略的实际应用领域。
