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Microbial Biosensors01:17

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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Reusable terahertz metasurface microfluidic sensor with enhanced sensitivity for trace liquid analysis.

Yunhao Cao, Hongshun Sun, Mingyao Gao

    Optics Express
    |November 11, 2025
    PubMed
    Summary

    This study introduces a novel terahertz (THz) metasurface sensor with a microfluidic channel for highly sensitive detection of trace solutions. It shows significantly enhanced sensitivity for analyzing both polar and non-polar analytes.

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    Area of Science:

    • Terahertz (THz) sensing technology
    • Metasurface sensor development
    • Microfluidics for chemical analysis

    Background:

    • Conventional THz sensing platforms face challenges with low sensitivity and detecting trace amounts of analytes.
    • Existing metasurface sensors require improvement for enhanced detection capabilities.

    Purpose of the Study:

    • To develop a reusable, high-sensitivity THz metasurface sensor integrated with an ultra-thin microfluidic channel.
    • To overcome limitations in sensitivity and trace solution detection in current THz sensing platforms.

    Main Methods:

    • Comprehensive numerical simulations were conducted to design and optimize the sensor.
    • Experimental validation was performed to confirm the sensor's performance.
    • Integration of a 4.1 µm ultra-thin microfluidic channel with a THz metasurface.

    Main Results:

    • Achieved a sensitivity of 0.565 THz/RIU for minute analyte volumes (0.4 µL).
    • Demonstrated a 2.58-to-5.64-fold enhancement in sensitivity compared to conventional THz metasurface structures.
    • Measured significant resonance frequency shifts for various analytes including ethanol, methanol, glycerin, and water.

    Conclusions:

    • The developed THz metasurface sensor offers high sensitivity for detecting trace amounts of both polar and non-polar analytes.
    • This advancement has significant implications for biochemical sensing and aqueous solution analysis.
    • The sensor's reusability and enhanced sensitivity represent a major step forward in THz sensing technology.