基于水凝胶的颜色动态可调的金属-介质-金属结构  

Hydrogel-Based Metal-Insulator-Metal Structures with Dynamically Tunable Colors

作　　者：倪海彬 沈依 周俊萍[1] 高绪之 倪波 常建华[1] Ni Haibin;Shen Yi;Zhou Junping;Gao Xuzhi;Ni Bo;Chang Jianhua(School of Electronics&Information Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,Jiangsu,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044

出　　处：《光学学报》2024年第9期284-292,共9页Acta Optica Sinica

基　　金：国家自然科学基金(61605082,61875089)。

摘　　要：提出一种基于聚乙烯醇水凝胶(PVA)的金属-介质-金属结构,用于实现颜色动态可调的结构色传感器。利用PVA薄膜对相对湿度的溶胀/收缩和折射率变化响应,并结合法布里-珀罗(F-P)共振效应,实现了F-P共振波长随相对湿度变化而发生偏移,结构色随环境相对湿度的改变而变化。实验结果表明,当环境相对湿度在3.0%~84.2%范围内变化时,结构的颜色会发生显著变化,在CIE 1931色度空间中显示为坐标顺时针旋转,平均相对湿度灵敏度可达0.998 nm/%。该传感器色彩显示丰富,颜色随相对湿度变化明显,灵敏度较高,响应迅速,在湿度传感结合色彩显示的环境检测研究领域具有良好的应用前景。Objective Structural color is produced by the interaction between light and micro-nano structures.Under the constantly unchanged refractive index and lattice of the material,the color will remain stable.Therefore,structural color is more stable than chemical dyes,and structural color devices play a crucial role in color printing,medical diagnosis,and information storage.In particular,dynamic structural color sensing devices surpass the limitations of static structural color devices,possessing superior flexibility.Consequently,they have more applications in such areas as anti-counterfeiting,dynamic full-color displays,and security encryption.In summary,research on dynamic and adjustable structural color sensing devices holds practical significance.Some researchers have yielded dynamic structural color display by employing periodic micro-nano structural devices,such as metal hole arrays and metal disk arrays,in combination with adjustable insulating materials based on electrochemical activity or temperature/humidity sensitivity.However,the complex fabrication process relying on surface plasmon resonance(SPR)morphology for such structural color devices is cumbersome and involves multiple processing techniques,making it impractical for production.We propose and implement a metal-insulator-metal(MIM)structure based on hydrogel films.By leveraging the humidity-sensitive properties of the insulating layer material and the Fabry-Perot(F-P)resonance phenomenon,we realize dynamic,rapid,and easily fabricated structural color humidity sensing.Methods In hydrogel-based metal-insulator-metal structures with dynamically tunable colors,an Ag-PVA-Ag structure is formed to create an asymmetric F-P cavity.When incident light shines on the structure’s surface,the thin silver film on top allows light to be both transmitted and reflected,while the 200 nm thick bottom silver film prevents the incident light from passing through.The middle insulating layer of PVA forms the cavity of the F-P cavity and controls light waves through inte

关 键 词：薄膜 动态可调结构色 金属-介质-金属结构 法布里-珀罗共振 湿度传感 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]