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Related Concept Videos

Electric Field of Parallel Conducting Plates01:16

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Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution.
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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Updated: Feb 6, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Bessel-like beam generated by an axicon based on parallel-plate waveguides.

Tingting Shen, Tingting Lang, Mengru Wu

    Applied Optics
    |August 18, 2018
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    Summary

    Researchers developed a novel parallel-plate waveguide axicon for terahertz (THz) applications. This structure efficiently generates Bessel-like beams, crucial for advanced optical manipulation and power transmission.

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    Area of Science:

    • Optics and Photonics
    • Terahertz (THz) Technology
    • Waveguide Devices

    Background:

    • Axicons are key optical elements for generating zero-order Bessel-like beams.
    • Bessel-like beams offer desirable properties like small spot size, high brightness, and long collimation distances.
    • Applications include optical micromanipulation and power transmission.

    Purpose of the Study:

    • To propose and design a phase manipulation structure for axicon functionality in the terahertz (THz) region.
    • To investigate the influence of structural parameters on the generated Bessel-like beam.

    Main Methods:

    • Design of a phase manipulation structure using parallel-plate waveguides.
    • Simulation-based characterization of the generated zero-order Bessel-like beam.
    • Analysis of the impact of cone angle and incident Gaussian beam waist radius.

    Main Results:

    • A planar structure based on parallel-plate waveguides was designed for THz axicon functionality.
    • The structure effectively generates zero-order Bessel-like beams.
    • Simulation results show the influence of cone angle and beam waist on beam characteristics.

    Conclusions:

    • The proposed parallel-plate waveguide structure enables efficient generation of THz Bessel-like beams.
    • This planar design is easily fabricated and suitable for various THz applications.
    • Potential applications include THz imaging, sensing, and communication systems.