Leibniz Institute of Photonic Technology (IPHT Jena), Albert-Einstein-Str. 9, 07745 Jena, Germany.
Leibniz Institute of Photonic Technology (IPHT Jena), Albert-Einstein-Str. 9, 07745 Jena, Germany; Institute for Physical Chemistry, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany.
Anal Chim Acta. 2015 May 22;875:1-6. doi: 10.1016/j.aca.2015.03.028. Epub 2015 Mar 21.
In conventional absorption spectrometers, the range of accessible concentrations of analytes in aqueous solution is significantly limited by the dynamic range of the measurement system. Here we introduce the concept of multiscale spectroscopy allowing extending that range by orders of magnitude within one single device. The concept relies on using multiple light-sample interaction lengths, boosting the accessible concentration range by a particular extension factor. We experimentally implement our concept by a liquid core waveguide having multiple fiber ports side-wise attached to the waveguide, thus probing the light propagating inside the core at predefined distances from the input. This configuration provides three orders of magnitude of interaction length in one device. To verify the concept we exemplarily determine the concentrations of nitrate and of Rhodamine 6G in water, showing one hundred times improved measurement capabilities. The multiscale spectrometer uses the entire sample volume and allows the simultaneous measurement of fluorescence and attenuance. Due to its integrated design and the extended measurements capabilities, we anticipate application of our device in many application-relevant areas such as water quality analysis or environmental science.
在传统的吸收光谱仪中，水溶液中分析物的可测浓度范围受到测量系统动态范围的显著限制。在这里，我们引入了多尺度光谱学的概念，该概念允许在单个设备中通过特定的扩展因子将该范围扩展几个数量级。该概念依赖于使用多个光-样品相互作用长度，通过特定的扩展因子来提高可访问的浓度范围。我们通过具有多个光纤端口的液体芯波导实验性地实现了我们的概念，这些光纤端口侧向连接到波导上，从而在与输入的预定距离处探测在芯内传播的光。这种配置在一个设备中提供了三个数量级的相互作用长度。为了验证该概念，我们以硝酸盐和 Rhodamine 6G 在水中的浓度为例进行了验证，展示了一百倍的改进的测量能力。多尺度光谱仪使用整个样品体积，并允许同时测量荧光和衰减。由于其集成设计和扩展的测量能力，我们预计我们的设备将在许多相关应用领域得到应用，例如水质分析或环境科学。
