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Miniature Fabry-Perot interferometer based on a movable microsphere reflector.

Ke Tian, Jibo Yu, Xin Wang

    Optics Letters
    |February 1, 2020
    PubMed
    Summary
    This summary is machine-generated.

    We developed a compact Fabry-Perot interferometer (FPI) using a movable microsphere. This device achieves nanoscale resolution for precise nano-displacement measurements, paving the way for miniaturized photonic devices.

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    Area of Science:

    • Optics and Photonics
    • Micro-optics
    • Interferometry

    Background:

    • Fabry-Perot interferometers (FPIs) are crucial optical sensing tools.
    • Miniaturization of FPIs is essential for advanced applications.
    • Existing FPI designs face limitations in size and sensitivity.

    Purpose of the Study:

    • To propose and demonstrate a novel miniature FPI.
    • To utilize a movable microsphere as a reflector for enhanced performance.
    • To explore applications in nano-displacement measurement.

    Main Methods:

    • Fabrication of a microsphere at the tip of a half-tapered optical fiber.
    • Formation of a two-beam interference using fiber interfaces and microsphere reflection.
    • Characterization of the FPI's response to external displacement.
    • Analysis of the reflection spectrum and free spectral range.

    Main Results:

    • Achieved a highly linear response to displacement.
    • Demonstrated a displacement sensitivity of 11.9 pm/nm.
    • Obtained a nanoscale resolution of 1.7 nm.
    • Showcased wide-range displacement measurement capability via spectral analysis.

    Conclusions:

    • The movable microsphere FPI offers high sensitivity and resolution for nano-displacement sensing.
    • The microsphere reflector concept enables significant miniaturization of photonic devices.
    • This technology holds promise for advanced nano-measurement applications.