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Related Concept Videos

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
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Related Experiment Video

Updated: Jul 16, 2025

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Terahertz Bessel beam generator.

Jiu-Sheng Li, Jie Cheng, Dong-Ping Zhang

    Applied Optics
    |September 14, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a compact reflective metasurface for generating terahertz Bessel beams, overcoming limitations of traditional methods. The new generator shows promise for applications in wireless communications and advanced imaging.

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    Area of Science:

    • Optics and Photonics
    • Metamaterials
    • Terahertz Technology

    Background:

    • Bessel beams offer significant potential in wireless energy transmission and high-speed communications.
    • Traditional Bessel beam generation methods suffer from large size, low efficiency, and manufacturing complexity.

    Purpose of the Study:

    • To develop a compact and efficient terahertz Bessel beam generator.
    • To address the limitations of conventional Bessel beam generation techniques.

    Main Methods:

    • Design and fabrication of a reflective metasurface comprising a metal pattern, dielectric layer, and bottom metal plate.
    • Utilizing right circularly polarized (RCP) wave incidence to generate Bessel beams.
    • Analysis of electric field intensity, phase distribution, and mode purity of generated beams.

    Main Results:

    • Successful generation of zero-order Bessel beams and zero-order symmetric double Bessel beams.
    • Demonstration of an inverse relationship between axicon angle and propagation distance for first-order Bessel beams.
    • Higher-order Bessel beams exhibit more concentrated energy and stable field distribution compared to ordinary vortex beams.

    Conclusions:

    • The reflective metasurface provides a viable solution for compact and efficient terahertz Bessel beam generation.
    • The developed generator holds potential for applications in terahertz wireless communications, measurement, radar detection, and imaging.