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Updated: Mar 14, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Optofluidic two-dimensional grating volume refractive index sensor.

Anirban Sarkar, B N Shivakiran Bhaktha, Sugata Pratik Khastgir

    Applied Optics
    |September 24, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an optofluidic sensor using a 2D grating for precise lab-on-a-chip refractive index measurements. The device accurately monitors fluidic refractive index changes, showing potential for dynamic on-chip sensing applications.

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    Area of Science:

    • Optofluidics
    • Nanophotonics
    • Sensor Technology

    Background:

    • Lab-on-a-chip devices require precise sensing capabilities.
    • Refractive index sensing is crucial for analyzing fluid composition.
    • Optofluidic integration offers miniaturized sensing solutions.

    Purpose of the Study:

    • To develop and demonstrate an optofluidic reservoir with a 2D grating.
    • To utilize far-field diffraction patterns for refractive index sensing.
    • To assess the accuracy and potential of the device for on-chip monitoring.

    Main Methods:

    • Fabrication of an optofluidic reservoir with an integrated 2D grating.
    • Optical characterization of diffraction patterns generated by the grating.
    • Monitoring changes in diffraction patterns for fluids with varying refractive indices.

    Main Results:

    • Observed diffraction patterns closely matched analytical fringe patterns.
    • The device detected refractive index variations with an accuracy of 6x10^-3 RIU.
    • Far-field diffraction pattern changes correlated with fluid refractive index.

    Conclusions:

    • The optofluidic reservoir with a 2D grating functions as a sensitive refractive index sensor.
    • The device demonstrates reliable performance for on-chip monitoring of dynamic refractive index changes.
    • This technology holds promise for advanced lab-on-a-chip analytical tools.