Bragg gratings based on hybrid polymers for analytical sensor technologies

本提案的目标是开发一种用于液体和气体定性和定量分析的光学传感器系统。为此，Bragg光栅的光子结构将被用于其在Ormocer®混合聚合物中的可行性已经在dfg项目的范围内得到了证明。努力的概念是基于光学分路系统，通过创新的UV增强基材共形压印光刻（UV- scil）成型成混合聚合物。这个紧凑的波导和耦合器系统，占地只有几平方厘米，由不同周期的体积型布拉格光栅矩阵组成。采用静态相位掩模技术结合krf准激光诱导光栅。在传感器系统中引入宽波段入射光谱的光，产生多色反射，作为每个内切布拉格光栅的单个反射的总和。为了补偿可能的交叉灵敏度（例如，由于温度波动），单个布拉格光栅可以被隔离。此外，目标概念允许对单个元素进行选择性敏化，以达到一般或分析师特定灵敏度的增加。由于使用布拉格光栅作为传感器元件，传感器的单一连接就足够了，通过单模光纤耦合到系统中来实现。为了描述和改进系统集成，本项目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.