Berramdane Kheloud, Lucío María Isabel, Ramírez Manuel G, Navarro-Fuster Víctor, Bañuls María-José, Maquieira Ángel, Morales-Vidal Marta, Beléndez Augusto, Pascual Inmaculada
I. U. Física Aplicada a las Ciencias y las Tecnologías, Universidad de Alicante, Carretera San Vicente del Raspeig s/n, San Vicente del Raspeig 03690, Spain.
Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Universitat Politècnica de València, Universitat de València, Camino de Vera s/n, Valencia 46022, Spain.
ACS Appl Mater Interfaces. 2024 Sep 11;16(36):48187-48202. doi: 10.1021/acsami.4c06436. Epub 2024 Aug 26.
The development and optimization of holographic materials represent a great challenge today. These materials must be synthesized according to the characteristics that are desirable in photonic devices whose application is the object of investigation. In certain holographic sensors and biosensors, it is essential that the recording material be stable in liquid media. Furthermore, the holographic gratings stored in them must have temporal and structural stability, so that they can act as transducers of the analytical signal. Therefore, it is essential to optimize its storage in terms of the chemical composition of the material and the optical parameters of recording. This work focuses on the study of the storage optimization of unslanted transmission volume phase holograms in photohydrogels based on acrylamide and ,-methylenebis(acrylamide). Hydrogel matrices, also composed of acrylamide and ,-methylenebis(acrylamide), with different degrees of cross-linking were used and analyzed by scanning electron microscopy and UV-visible spectroscopy. The best results in terms of diffraction efficiency were reached for hydrogel matrices with an acrylamide/,-methylenebis(acrylamide) molar ratio between 19.9 and 26. This relationship was also optimized in the incubator solution used to incorporate the components necessary for the formation of the holograms in the hydrogel matrices. The maximum diffraction efficiency, about 35%, was achieved when using an incubation solution with an acrylamide/,-methylenebis(acrylamide) molar ratio of 4.35. The influence of the physical thickness of the hydrogel layers, the intensity, and the exposure time on the diffraction efficiency was also investigated and optimized. In addition, the behavior of the hologram was analyzed after a washing stage with PBST. A simple model that considered the effects of bending and attenuation of holographic gratings was proposed and used to obtain the optical parameters of the holograms.
如今，全息材料的开发与优化是一项巨大的挑战。这些材料必须根据光子器件所需的特性进行合成，而光子器件的应用正是研究的对象。在某些全息传感器和生物传感器中，记录材料在液体介质中保持稳定至关重要。此外，存储在其中的全息光栅必须具有时间和结构稳定性，以便它们能够作为分析信号的传感器。因此，从材料的化学成分和记录的光学参数方面优化其存储至关重要。这项工作专注于研究基于丙烯酰胺和N,N'-亚甲基双丙烯酰胺的光致水凝胶中无倾斜透射体积相位全息图的存储优化。使用了由丙烯酰胺和N,N'-亚甲基双丙烯酰胺组成、具有不同交联度的水凝胶基质，并通过扫描电子显微镜和紫外可见光谱进行分析。对于丙烯酰胺/N,N'-亚甲基双丙烯酰胺摩尔比在19.9至26之间的水凝胶基质，在衍射效率方面取得了最佳结果。在用于在水凝胶基质中掺入形成全息图所需成分的孵育溶液中，这种关系也得到了优化。当使用丙烯酰胺/N,N'-亚甲基双丙烯酰胺摩尔比为4.35的孵育溶液时，实现了约35%的最大衍射效率。还研究并优化了水凝胶层的物理厚度、强度和曝光时间对衍射效率的影响。此外，在用PBST洗涤阶段后分析了全息图的行为。提出了一个考虑全息光栅弯曲和衰减影响的简单模型，并用于获取全息图的光学参数。
