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Single-arm double-mode double-order planar waveguide interferometric sensor.

S S Sarkisov, D E Diggs, G Adamovsky

    Applied Optics
    |March 22, 2008
    PubMed
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    This study introduces a novel polymer film sensor utilizing interference measurements for detecting environmental changes. The sensor demonstrates high sensitivity to both temperature and ammonia (NH3) concentrations.

    Area of Science:

    • Materials Science
    • Optical Sensing
    • Chemical Sensing

    Background:

    • Thin-film waveguides are crucial for optical sensing applications.
    • Interference measurements offer a sensitive method for detecting phase shifts.
    • Polymer films doped with indicator dyes can respond to environmental stimuli.

    Purpose of the Study:

    • To develop and characterize a novel sensor based on phase delay interference in a thin-film waveguide.
    • To investigate the sensor's response to changes in ambient temperature and ammonia (NH3) concentration.

    Main Methods:

    • Utilizing a polymer film doped with Bromocresol Purple as the sensing element.
    • Simultaneously exciting TM(0) and TM(1) modes in a slab thin-film waveguide.
    • Employing focusing optics and a prism coupler for mode excitation and decoupling.

    Related Experiment Videos

  • Analyzing interference patterns generated by recombined modes at an output optical fiber.

    • Main Results:

    • The sensor exhibits a sensitivity of 1.5°C to ambient temperature variations.
    • The sensor demonstrates a sensitivity of 200 parts in 10^6 (ppm) to NH3 for a full signal oscillation.
    • Interference measurements of phase delay between different order modes form the core sensing technique.

    Conclusions:

    • The developed polymer film waveguide sensor effectively detects temperature and ammonia concentrations.
    • The sensor's design leverages interference patterns for sensitive environmental monitoring.
    • This technology holds potential for various optical sensing applications requiring high sensitivity.