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    This study presents a nanometric sensor using distributed feedback (DFB) laser interferometry. It reliably detects displacements down to 12 nanometers, offering a new tool for precise measurements.

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    Area of Science:

    • Photonics and optical sensing
    • Nanotechnology and metrology

    Background:

    • Optical interferometry is crucial for high-precision measurements.
    • Distributed feedback (DFB) lasers offer unique properties for sensing applications.

    Purpose of the Study:

    • To demonstrate a novel nanometric sensor utilizing a DFB laser.
    • To achieve highly sensitive displacement detection using optical feedback interferometry.

    Main Methods:

    • The sensor is based on feedback interferometry within a DFB laser.
    • Measurements are performed by monitoring optical frequency or laser voltage.
    • Optimal optical feedback ranges were identified for reliable operation.

    Main Results:

    • The sensor reliably operates down to an extrapolated 12 nanometers.
    • A minimum detectable displacement of λ/130 was achieved at ∼1550 nm wavelength.
    • The sensor demonstrates high sensitivity and reliability.

    Conclusions:

    • A DFB laser-based nanometric sensor provides a reliable method for precise displacement detection.
    • The sensor's performance is optimized through careful control of optical feedback.
    • This technology has potential applications in various fields requiring nanoscale metrology.