Bragg gratings based on hybrid polymers for analytical sensor technologies

这项提议的目标是开发一种用于液体和气体的定性和定量分析的光学传感器系统。为此，布拉格光栅的光子结构将被使用，因为它在DFG项目范围内已被证明在Ormoerce®杂化聚合物中的可行性。奋进的概念基于光学分路器系统，该系统通过创新的UV增强型衬底共形压印光刻(UV-SCLE)模塑成杂化聚合物。这种仅覆盖几平方厘米的紧凑的波导和耦合器系统，由不同周期的体型布拉格光栅组成的矩阵。利用静态位相掩模技术和KrF-Excimer型激光器相结合的方法实现了光栅的产生。将宽频带入射光谱引入传感器系统，产生多色反射，即每个内嵌的布拉格光栅的单个反射的总和。为了补偿可能的交叉敏感(例如，由于温度波动)，可以隔离单独的布拉格光栅。此外，有针对性的概念允许对单一元素进行选择性敏化，目的是提高一般或分析师特有的敏感度。由于采用布拉格光栅作为传感元件，通过单模光纤与系统的耦合实现了传感器的单一连接。为了表征和改进系统集成，在本项目中对几种耦合策略进行了分析和优化。

The objective of this proposal is the development of an optical sensor system for the qualitative and quantitative analysis of liquids and gases. For this purpose, the photonic structure of a Bragg grating will be used as its feasibility in Ormocer® hybrid polymers has already been proven within the scope of the DFG-projects.The striven concept is based on an optical splitter system, which is molded into hybrid polymers via the innovative UV enhanced substrate conformal imprint lithography (UV-SCIL). This compact system of waveguides and couplers, covering only few square centimeters, comprises a matrix of volume type Bragg gratings with different periodicity. The gratings are induced by using static phase mask technology combined with a KrF-Excimerlaser. Introducing a broad banded incident spectrum of light into the sensor system, a polychromatic reflection is created as sum of the individual reflections of each inscribed Bragg grating. To compensate possible cross sensitivities (e.g. due to temperature fluctuations) individual Bragg gratings could be isolated. Further on, the targeted concept allows a selective sensitization of single elements aiming for a general or analyst specific increase in sensitivity. Due to the fact of using Bragg gratings as sensor elements, a singular connection of the sensor suffices, realized by the coupling of a single-mode fiber to the system. To characterize and improve the system integration, an analysis and optimization of several coupling strategies is striven within this project.