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Elastomeric 2D grating and hemispherical optofluidic chamber for multifunctional fluidic sensing.

Zhida Xu, Xinhao Wang, Kevin Han

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |December 11, 2013
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel optofluidic sensor using a 2D grating for liquid analysis. The sensor accurately measures refractive index, pressure, opacity, and detects biomolecules, showing potential for biofluid monitoring.

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    Area of Science:

    • Optofluidics
    • Nanophotonics
    • Biosensing

    Background:

    • Optofluidic devices offer miniaturized platforms for fluid manipulation and analysis.
    • Two-dimensional (2D) gratings provide unique optical properties for sensing applications.
    • Accurate monitoring of liquid parameters and biomolecular interactions is crucial in various scientific fields.

    Purpose of the Study:

    • To develop and characterize a novel optofluidic sensor based on an elastomeric 2D grating.
    • To investigate the sensor's capability for retrieving multiple liquid parameters.
    • To demonstrate the sensor's application in detecting specific analytes like glucose and proteins.

    Main Methods:

    • Integration of an elastomeric 2D grating within a hemispherical fluid chamber.
    • Utilizing laser diffraction (reflection and transmission) for optical interrogation.
    • Employing finite-difference time-domain (FDTD) electromagnetic simulations for mechanism investigation.
    • Analyzing diffraction pattern characteristics (size, power, shape) for parameter retrieval.

    Main Results:

    • The sensor successfully retrieved liquid parameters including refractive index, pressure, and opacity with high sensitivity.
    • Demonstrated accurate monitoring of glucose concentration in phosphate-buffered saline solutions.
    • Successfully detected the binding of bovine serum albumin (BSA) and anti-BSA IgG in free solution.

    Conclusions:

    • The developed optofluidic sensor is a low-cost, multifunctional, and reliable platform.
    • It exhibits high sensitivity and accuracy in measuring various liquid properties.
    • Potential applications include real-time monitoring of biofluids, such as blood during hemodialysis.