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High Pressure Single Crystal Diffraction at PX^2
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Vectorial diffraction properties of THz vortex Bessel beams.

Zhen Wu, Xinke Wang, Wenfeng Sun

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    |February 7, 2018
    PubMed
    Summary

    Researchers generated terahertz (THz) vortex Bessel beams, combining spiral wavefronts and non-diffractive properties. These beams show potential for advanced optical applications and have been experimentally characterized.

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    Area of Science:

    • Optics and Photonics
    • Terahertz (THz) Science and Technology

    Background:

    • Vortex Bessel beams merge optical vortex and Bessel beam properties.
    • These beams offer spiral wavefronts and non-diffractive propagation.
    • Potential applications include optical trapping, fabrication, and communications.

    Purpose of the Study:

    • To generate and characterize terahertz (THz) vortex Bessel beams.
    • To investigate their vectorial diffraction properties.
    • To provide experimental and theoretical foundations for THz vortex Bessel beam applications.

    Main Methods:

    • Generation of linearly and circularly polarized THz vortex Bessel beams using a THz quarter wave plate, spiral phase plate, and Teflon axicons.
    • Comprehensive characterization of vectorial diffraction properties using a THz focal-plane imaging system.
    • Simulation of experimental phenomena using the vectorial Rayleigh diffraction integral.

    Main Results:

    • Demonstration of THz vortex Bessel beam generation with controlled polarization states.
    • Detailed analysis of transverse (Ex, Ey) and longitudinal (Ez) polarization components.
    • Observation of how axicon opening angle influences spot size, diffraction-free range, and phase evolution.

    Conclusions:

    • Successful generation and characterization of THz vortex Bessel beams.
    • Accurate simulation of experimental results validates the theoretical model.
    • Provides a foundation for understanding and utilizing THz vortex Bessel beams in various applications.