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Theoretical analysis and experimental verification on optical rotational Doppler effect.

Hailong Zhou, Dongzhi Fu, Jianji Dong

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    |May 4, 2016
    PubMed
    Summary

    We developed a theoretical model for the optical rotational Doppler effect. The frequency shift depends on the spinning object

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    Area of Science:

    • Optics and Photonics
    • Quantum Optics
    • Electromagnetism

    Background:

    • The optical rotational Doppler effect (ORD) describes frequency shifts in light interacting with rotating objects.
    • Understanding ORD is crucial for applications involving rotating systems and light manipulation.
    • Existing models may not fully capture the nuances of frequency shift dependence on object properties.

    Purpose of the Study:

    • To develop a comprehensive theoretical model for the optical rotational Doppler effect.
    • To elucidate the relationship between object surface properties, orbital angular momentum (OAM), and frequency shift.
    • To provide a framework for experimental verification and explore potential applications.

    Main Methods:

    • Utilized a modal expansion method for theoretical investigation.
    • Derived relationships between frequency shift, OAM mode indices, and object rotation speed.
    • Conducted experimental verification of the proposed theoretical model.

    Main Results:

    • The frequency shift in the optical rotational Doppler effect is determined by the spinning object's surface.
    • A reduced Doppler shift is linearly proportional to the difference in input and output OAM mode indices.
    • The reduced Doppler shift also exhibits a linear dependence on the object's rotational speed.

    Conclusions:

    • The spatial spiral phase distribution of a spinning object dictates its frequency content.
    • The theoretical model enhances understanding of the physical mechanisms behind the rotational Doppler effect.
    • Potential applications include detection of rotating bodies, surface imaging, and OAM light metrology.