School of Chemical Engineering and Analytical Science, Manchester Institute of Biotechnology, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
Analyst. 2013 Mar 21;138(6):1803-11. doi: 10.1039/c3an36714b. Epub 2013 Feb 1.
Evanescent wave (EW) broadband absorption spectroscopy is commonly interfaced with a range of analytical systems, including microfluidic flow cells, for identification and quantitation of species. A miniaturised spectrometer integrated with a microfluidic flow cell is useful to permit on-site analysis of samples. This work reports a novel leaky waveguide grating (LWG) device, which is able to obtain an absorption spectrum of an analyte of interest (in this case, methylene blue) without an external spectrometer. At 600 nm, the spectral resolution and the minimum detectable absorption coefficient of the LWG device is 49.5 nm and 1.65 cm(-1), respectively. The LWG can be fabricated on birefringent substrates such as plastics because the performance of the device is independent of the polarisation of the excitation source. The LWG device was fabricated using microcontact printing and hence can be easily mass produced.
消逝波（EW）宽带吸收光谱通常与一系列分析系统接口，包括微流控流动池，用于识别和定量物种。与微流控流动池集成的微型光谱仪可用于允许对样品进行现场分析。这项工作报道了一种新型的泄漏波导光栅（LWG）器件，它能够在没有外部光谱仪的情况下获得感兴趣的分析物（在这种情况下为亚甲蓝）的吸收光谱。在 600nm 处，LWG 器件的光谱分辨率和最小可检测吸收系数分别为 49.5nm 和 1.65cm-1。由于器件的性能与激发源的偏振无关，因此 LWG 可以在双折射衬底（如塑料）上制造。LWG 器件是使用微接触印刷制造的，因此可以很容易地批量生产。
