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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Low-cost planar waveguide-based optofluidic sensor for real-time refractive index sensing.

Devesh Barshilia, Lai-Kwan Chau, Guo-En Chang

    Optics Express
    |September 29, 2020
    PubMed
    Summary

    We developed cost-effective, mass-producible planar waveguide sensors for fast refractive index (RI) detection. These sensors utilize optical power variations for simple, real-time RI measurements with high resolution.

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    Area of Science:

    • Photonics
    • Microfluidics
    • Sensor Technology

    Background:

    • Refractive index (RI) sensing is crucial for various applications.
    • Existing methods may lack sensitivity, cost-effectiveness, or mass-producibility.
    • Planar waveguide sensors offer potential for integrated sensing solutions.

    Purpose of the Study:

    • To design, fabricate, and characterize novel, mass-producible planar waveguide sensors for rapid RI sensing.
    • To integrate these sensors with microfluidic channels for versatile applications.
    • To demonstrate a facile and cost-effective fabrication process.

    Main Methods:

    • Fabrication of suspended glass planar waveguides on glass substrates using vacuum-less processes.
    • Integration of microfluidic channels with the waveguide sensors.
    • Characterization of sensor response to varying refractive indices by measuring transmitted optical power.
    • Quantification of sensor resolution through experimental measurements.

    Main Results:

    • Successful fabrication of mass-producible, sensitive planar waveguide sensors.
    • Demonstration of real-time RI detection based on optical power variations due to coupling loss.
    • Achieved a high resolution of 5.65 × 10-4 RIU.
    • Facile and cost-effective construction via vacuum-less processes enabling high throughput.

    Conclusions:

    • The developed planar waveguide sensors are suitable for rapid and sensitive RI sensing.
    • The mass-producible and cost-effective nature of the sensors has significant implications for various RI-sensing applications.
    • This technology offers a promising platform for integrated photonic and microfluidic sensing systems.