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Wavelength-interrogated optical sensor for biochemical applications.

M Wiki, R E Kunz

    Optics Letters
    |December 8, 2007
    PubMed
    Summary
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    A new miniature optical sensor uses laser diodes to precisely measure refractive index changes. This high-speed sensor achieves excellent resolution for detecting minute surface mass changes, enabling versatile applications.

    Area of Science:

    • Integrated optics
    • Optical sensing technologies
    • Photonics

    Background:

    • Miniaturized sensors are crucial for high-throughput analysis.
    • Accurate measurement of refractive index changes is key for detecting molecular interactions.
    • Existing technologies face limitations in speed and sensitivity.

    Purpose of the Study:

    • To develop a novel miniature integrated-optical sensor.
    • To enable versatile multichannel sensing applications.
    • To achieve high-speed, high-resolution measurements of effective refractive index.

    Main Methods:

    • Utilized wavelength-modulation techniques with vertical-cavity surface-emitting lasers (VCSELs).
    • Interrogated multiple waveguide sensing regions on a single integrated-optical chip.

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  • Demonstrated a miniature sensor system for experimental validation.

    • Main Results:

    • Achieved a resolution of 10(-7) (peak to peak) for effective refractive index changes.
    • Demonstrated a surface-mass coverage resolution of 130 fg/mm(2) (peak to peak).
    • Validated the sensor's capability for high data rate measurements.

    Conclusions:

    • The developed miniature integrated-optical sensor offers versatile multichannel capabilities.
    • The sensor demonstrates high sensitivity and resolution for refractive index and surface mass detection.
    • This technology is suitable for various applications requiring accurate, high-speed optical sensing.