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24 October 2014 Compact microfluidic sensing by introducing effective phase shift in fiber Bragg grating
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A compact microfluidic refractive index sensor fabricated by drilling hole in the middle section of a fiber Bragg grating (FBG) is reported herein. The laser-drilled hole provides a microfluidic channel for the aqueous sample to pass through while at the same time permits coupling of the interrogating light to detect the target analyte. The reported sensor takes advantage of the fact that a small phase shift in the central region of the grating will result in a very sharp peak in the FBG stop-band. The phase shift can be related to a range of possible perturbations inside the microfluidic channel, including passage of cells, beads and a shift in the concentration of certain fluidic component. The amount of wavelength shift of the peak in the FBG stop-band represents the change in the refractive index inside the microfluidic channel. Simulation results indicate very favorable sensor signal characteristics such as large wavelength shift and sharp reflection dips. The reported microfluidic phase shift FGB sensor could be a good candidate for portable flow cytometry applications.
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Minghui Tang, Guanghui Wang, Ho-Pui A. Ho, and Xuping Zhang "Compact microfluidic sensing by introducing effective phase shift in fiber Bragg grating", Proc. SPIE 9270, Optoelectronic Devices and Integration V, 92700N (24 October 2014);

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