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In the study of the mechanics of materials, analyzing the behavior of prismatic members under opposing couples is crucial for understanding internal stress distributions, which are essential for structural design. When subjected to couples, a prismatic member experiences internal forces that maintain equilibrium. A couple, characterized by two equal and opposite forces, creates a moment but no resultant force. The internal forces at any section cut of the member must balance these external...
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Mirror-rotation-symmetrical single-focus spiral zone plates.

Zhen-Nan Tian, Qi-Dai Chen, Zhi-Yong Hu

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    Researchers developed novel mirror-rotation-symmetrical single-focus spiral zone plates (MS-SZPs) using femtosecond laser writing. These optical elements generate single-focus vortex beams, showing promise for advanced optical applications.

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    Area of Science:

    • Optics and Photonics
    • Laser Fabrication
    • Nanotechnology

    Background:

    • Vortex beams are crucial for advanced optical applications.
    • Fabricating complex optical elements with high precision is challenging.

    Purpose of the Study:

    • To report the fabrication of mirror-rotation-symmetrical single-focus spiral zone plates (MS-SZPs).
    • To demonstrate the capability of MS-SZPs to generate single-focus vortex beams.

    Main Methods:

    • Femtosecond laser direct writing was employed for fabrication.
    • Microscopic imaging systems were used for experimental investigation.
    • Theoretical simulations were conducted for comparison.

    Main Results:

    • MS-SZPs with reverse mirror-rotation symmetry were successfully fabricated.
    • The fabricated elements generated a single-focus vortex beam.
    • Experimental results closely matched theoretical predictions.

    Conclusions:

    • The novel MS-SZPs exhibit excellent optical properties.
    • This technology is expected to find wide applications in optical communication, quantum computation, and optical manipulation.