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Microfluidic flow direction and rate vector sensor based on a partially gold-coated TFBG.

Changyu Shen, Dejun Liu, Xiaokang Lian

    Optics Letters
    |May 16, 2020
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    Summary

    This study presents a novel microfluidic flow sensor. A gold-coated tilted fiber Bragg grating (TFBG) detects liquid flow rate and direction in microfluidic chips.

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    Area of Science:

    • Photonics and Sensing Technologies
    • Microfluidics and Lab-on-a-Chip Devices
    • Optical Fiber Sensors

    Background:

    • Accurate monitoring of microfluidic flow rate and direction is crucial for various applications.
    • Existing sensing methods may have limitations in sensitivity, specificity, or integration into microfluidic systems.
    • Fiber Bragg gratings (FBGs) offer potential for miniaturized and robust sensing solutions.

    Purpose of the Study:

    • To develop and demonstrate a novel sensor for simultaneous measurement of microfluidic liquid flow rate and direction.
    • To utilize a partially gold-coated tilted fiber Bragg grating (TFBG) as the core sensing element.
    • To achieve unambiguous detection of flow parameters within microfluidic channels.

    Main Methods:

    • Fabrication of a TFBG with a nanoscale gold coating on a portion of its surface.
    • Integration of the coated TFBG into microfluidic channels for liquid flow exposure.
    • Analysis of wavelength shifts and amplitude changes in TFBG transmission resonances in the near-infrared spectrum.
    • Characterization of sensor performance across a range of liquid refractive indices (1.33-1.40).
    • Implementation of a temperature-insensitive referencing scheme using core mode resonance.

    Main Results:

    • The gold-coated TFBG sensor successfully detected both the rate and direction of microfluidic liquid flow.
    • Wavelength shifts and amplitude variations in TFBG resonances correlated unequivocally with flow parameters.
    • The sensor demonstrated reliable operation in liquids with refractive indices from 1.33 to 1.40.
    • The proposed design allows for inherent temperature insensitivity through wavelength referencing.

    Conclusions:

    • A novel, compact, and effective sensor for microfluidic flow rate and direction has been demonstrated.
    • Partially gold-coated TFBGs provide a sensitive and specific platform for microfluidic sensing.
    • The sensor's ability to operate across a range of refractive indices and its temperature insensitivity enhance its applicability in diverse microfluidic systems.