Zhou Ke, Geng Yaohui, Liu Hongpeng, Wang Shichan, Mao Dongyao, Yu Dan
Appl Opt. 2017 May 1;56(13):3714-3724. doi: 10.1364/AO.56.003714.
A novel substrate-free acrylamide photopolymer was proposed to improve holographic sensing characterization. The diffraction spectrum response of reflection volume grating recorded in the medium was characterized for exploring the improvement of sensitivity. The compared result indicated that the response rate and sensitivity were evidently improved by absorption of double surface in substrate-free polymer. The thickness of the sample as a significant factor was discussed in detail experimentally. During the sensing process, the inhibition concentration and concentration constant of organic vapor were extracted to evaluate the significance of sample thickness. Simultaneously, optimization of thickness could be considered as an effective approach to improve the response rate of holographic sensing. The reversibility of a novel holographic sensor with double surface was demonstrated by recovery measurement. The swelling ratio indicated that the peak wavelength shift was attributed to the expansion of binder induced by absorption of organic vapor. Theoretically, the sensing physical mechanism and the dynamic swelling process were analyzed and simulated using a diffusional model with nonlocal response. These experimental results provide an effective strategy for improving the response of a holographic sensor and accelerate the development of the holographic optical element based on photopolymer.
为了改善全息传感特性，提出了一种新型的无基底丙烯酰胺光聚合物。对记录在该介质中的反射体光栅的衍射光谱响应进行了表征，以探索灵敏度的提高。比较结果表明，无基底聚合物中双面吸收显著提高了响应速率和灵敏度。详细讨论了作为重要因素的样品厚度，并进行了实验研究。在传感过程中，提取了有机蒸汽的抑制浓度和浓度常数，以评估样品厚度的重要性。同时，优化厚度可被视为提高全息传感响应速率的有效方法。通过恢复测量证明了新型双面全息传感器的可逆性。溶胀率表明，峰值波长的移动归因于有机蒸汽吸收引起的粘合剂膨胀。理论上，使用具有非局部响应的扩散模型对传感物理机制和动态溶胀过程进行了分析和模拟。这些实验结果为提高全息传感器的响应提供了一种有效策略，并加速了基于光聚合物的全息光学元件的发展。
