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Structuring a terahertz beam by using a 3D-printed n-faced pyramid lens.

Qian Huang, Wei Liu, Yongqiang Yang

    Optics Express
    |May 14, 2021
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    Researchers created structured, non-diffracting terahertz (THz) beams using 3D-printed pyramid lenses. These beams maintain their form over distance, enabling advanced THz imaging applications with extended focal depth.

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    Area of Science:

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

    Background:

    • Terahertz (THz) beams typically spread due to diffraction.
    • Achieving non-diffracting beams is crucial for applications requiring stable propagation.
    • 3D printing offers novel possibilities for creating custom optical elements.

    Purpose of the Study:

    • To generate structured, non-diffracting terahertz (THz) beams.
    • To investigate the use of 3D-printed n-faced pyramid lenses for beam shaping.
    • To explore potential applications in THz imaging.

    Main Methods:

    • Designing and 3D-printing n-faced pyramid lenses.
    • Utilizing angular spectrum theory to derive analytical solutions for THz beam propagation.
    • Experimentally generating and measuring the characteristics of the structured THz beams.

    Main Results:

    • Successfully generated structured, non-diffracting THz beams using the 3D-printed lenses.
    • Experimental measurements confirmed the theoretical predictions of beam behavior.
    • The generated beams exhibited minimal diffraction over propagation distance.

    Conclusions:

    • 3D-printed n-faced pyramid lenses are effective for creating structured non-diffracting THz beams.
    • The experimental results align with theoretical models based on angular spectrum theory.
    • These structured non-diffracting THz beams hold promise for THz imaging applications requiring a large depth of focus.