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Microbial Biosensors01:17

Microbial Biosensors

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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Enhanced sensing-field overlap and active emission for a high-performance BIC sensor.

Jiahua Zhang, Kangni Wang, Lin Yong Qian

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    This study introduces an active laser sensor using a guided-mode resonance grating for improved refractive index (RI) sensing. The novel design overcomes limitations of conventional sensors, enabling high-precision measurements in compact systems.

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    Area of Science:

    • Photonics and optical sensing technologies.
    • Nanophotonics and metamaterial applications.
    • Integrated optics and laser systems.

    Background:

    • Conventional refractive index (RI) sensors face limitations in passivity and field distribution.
    • Guided-mode resonance (GMR) gratings offer potential for sensing but require enhancement.
    • Need for active, high-performance sensing solutions in compact optical systems.

    Purpose of the Study:

    • To develop an active laser sensor overcoming limitations of conventional RI sensors.
    • To utilize a single-layer GMR grating with slant ridges as both optical cavity and gain layer.
    • To achieve high-performance RI sensing with enhanced field confinement and active operation.

    Main Methods:

    • Fabrication of a single-layer GMR grating with slant ridges.
    • Excitation of a quasi-bound state in the continuum via slant ridges.
    • Destructive interference between GMR mode and quasi-bound state for a transmissive resonance mode.
    • Alignment of resonance wavelength with a gain medium for active sensing.

    Main Results:

    • Demonstration of a transmissive resonance mode with a broadband spectrum.
    • Exploitation of unique field distribution concentrated within gap regions.
    • Achieved active, high-performance sensing by aligning resonance with the gain medium.
    • Successful integration into compact systems, such as optical fiber end facets.

    Conclusions:

    • The developed active laser sensor offers a promising approach for RI sensing.
    • The GMR grating with slant ridges effectively addresses limitations of conventional RI sensors.
    • This technology paves the way for high-precision, integrated laser sensor applications.