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Direction-sensitive transverse velocity measurement by phase-modulated structured light beams.

Carmelo Rosales-Guzmán, Nathaniel Hermosa, Aniceto Belmonte

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    This study introduces a new optical method to determine the motion direction of microparticles. By dynamically controlling light beam phases, researchers can now measure directional velocity, advancing remote sensing capabilities.

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    Area of Science:

    • Optics
    • Photonics
    • Applied Physics

    Background:

    • Structured light beams enable remote sensing of target velocity perpendicular to propagation.
    • Interferometric setups typically yield only the magnitude of frequency shift, hindering directional determination.

    Purpose of the Study:

    • To present a novel method for deducing the direction of particle motion using structured light.
    • To overcome the limitations of traditional interferometric methods in determining motion direction.

    Main Methods:

    • Dynamic control of phase in the transverse plane of a structured light beam.
    • Analyzing changes in frequency shift magnitude correlated with transverse phase modulation.
    • Utilizing a Laguerre-Gaussian beam with rotating phase for demonstration.

    Main Results:

    • Successfully deduced the direction of movement for rotating microparticles.
    • Demonstrated that changes in frequency shift magnitude indicate motion direction.
    • Validated the method using a dynamically configurable optical beam generator.

    Conclusions:

    • The proposed method effectively determines the direction of particle motion.
    • This technique offers a significant advancement for remote sensing applications.
    • The method is adaptable to various motion types through optical beam engineering.