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Sensor based on an integrated optical microcavity.

E Krioukov, D J W Klunder, A Driessen

    Optics Letters
    |November 17, 2007
    PubMed
    Summary
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    This study introduces a novel integrated optical sensor using a cylindrical microcavity (MC) to detect refractive index changes as small as 10(-4). This rugged, inexpensive sensor leverages whispering-gallery modes (WGMs) for sensitive analyte detection.

    Area of Science:

    • Photonics and optical sensing technologies.
    • Microscale device engineering and fabrication.
    • Biomedical and chemical sensing applications.

    Background:

    • Whispering-gallery modes (WGMs) in microcavities (MCs) enable efficient optical energy storage.
    • Sensing applications require high sensitivity to detect minute changes in the microenvironment.
    • Integrated optical sensors offer miniaturization and cost-effectiveness.

    Purpose of the Study:

    • To propose and demonstrate a novel integrated optical sensor based on a cylindrical microcavity.
    • To investigate the potential of monitoring scattering intensity from MCs for refractive index sensing.
    • To achieve high sensitivity for detecting small changes in refractive index.

    Main Methods:

    • Fabrication of a cylindrical microcavity (MC).

    Related Experiment Videos

  • Excitation and monitoring of whispering-gallery modes (WGMs) within the MC.
  • Measurement of scattering intensity changes due to refractive index variations caused by analyte adsorption.

    • Main Results:

    • Demonstration of an integrated optical sensor with a cylindrical microcavity.
    • Successful detection of minute refractive index changes as low as 10(-4) experimentally.
    • The sensor exhibits potential for miniaturization to approximately 8 micrometers, with ruggedness and low cost.

    Conclusions:

    • The proposed cylindrical microcavity-based integrated optical sensor is a promising platform for sensitive refractive index detection.
    • Monitoring WGM scattering intensity provides a viable method for detecting analyte adsorption.
    • The sensor's small size, ruggedness, and low cost make it suitable for various sensing applications.